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Old 01-08-2019, 11:51 AM   #1551
Justthetom
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Member#: 496174
Join Date: Jan 2019
Location: Downers Grove, Illinois
Vehicle:
2000 Impreza OBS
Grey

Default Double code p0420, 267k miles, 2000 OBS

Background Info:
2000 Impreza OBS(manual), two owners(including me), well maintained and (almost always) serviced on time. 267k miles and everything is stock/original to the car minus the scheduled replacement parts and a swapped throttle body from a 1999 Impreza 2.2l (down pipe sprung a leak causing overheating and the "new" throttle body only cost around $70). Not much of a car guy, but I'm learning.

Situation:
I was late on my oil change this time (life happens) and I had just replaced my knock sensor for the code I was throwing originally. My inspection is this month and on my way to the state facility, my check engine light comes on. I go to auto-zone to get them to read the code for me and they tell me "The code is p0420 which is your catalytic converter. It's showing up twice.". Knowing very little about cars, I take to the internet for research.
After about a half an hour of reading, I feel like my worst nightmare has been realized and I have to replace the whole cat and possibly my whole exhaust. But then I take to the forums here and find a whole slew of information.

Solution (so far):
I waited until my gas tank was close to empty, put in catalytic converter cleaner (Redline) and drove (agressively on the highway/slow and steady around town) until I had to refuel. Filled up the tank and then dumped in a whole can of seafoam. I did some more highway driving (including 3 distinct pulls from 30mph to 80mph) and then around town driving like a "sensible grandpa". I returned home for several hours and, from a cold start, drove down a road that had intermittent stop lights every 4 or 5 miles with an average speed limit of 45-50mph for about an hour. When I woke up this morning and went to start Lucy Sue the Subaru to warm her up, no more codes. Checked in with auto-zone as well and they confirmed no codes.

I'm not sure if this is going to last longer than a day or two or if I'm actually in the clear, but I do hope this was helpful to someone.

P.S. definitely replacing the entire exhaust soon. Exhaust front to back is all original and truth be told, that kind of scares me haha.
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Old 01-13-2019, 11:02 AM   #1552
Travistee
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Member#: 220101
Join Date: Aug 2009
Vehicle:
2009 outback sport

Default P0420 after some welding work near muffler

I hit a rock that I couldn't see while backing up.
It broke the tail pipe off of the muffler.
The muffler shop cut the pipes, put on a sleeve and welded it.
That was on Monday. On Friday I got a check engine light. I don't know exactly how many miles I drove after it was welded. Maybe 50 . I drove about 20 miles before I got it welded. I supported the tail pipe by hanging it with a wire.

The shop also told me there could be some leakage where the CAT connects to the the tailpipe. I didn't ask them to do anything for that since I didn't know if it was going to be a problem or not. They didn't notice any other problems.

My code reader says P0420 Catalyst system below threshold Bank 1.
Could the code have been caused during the time the pipe was not connected to the muffler?
I cleared the codes today to see how long or if it comes back.

I haven't had any other codes for about two or three years.
Could a leak at the CAT - tailpipe cause that.

I want to get some opinions here before I go back for them to look at it again.
Edit:. 60 miles after I cleared the codes no check engine light.
I have the original exhaust system including the O2 sensors . No need to replace anything.

Mileage 197K

Thanks

Last edited by Travistee; 01-21-2019 at 10:07 AM. Reason: new info
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Old 01-16-2019, 09:50 PM   #1553
CarolineK
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Member#: 496575
Join Date: Jan 2019
Chapter/Region: NESIC
Vehicle:
2007 WRX Limited
Black

Default The CEL has been on for years...

I have a 2007 WRX, stock, with 94K and the CEL has been on for 2 years. For the past 2 rounds of inspections I've got it cleared long enough to get a sticker and it pops back on within hours of getting the sticker.

This year it will no longer clear (P0410 Secondary Injection System) and I dumped $1.5K to replace the secondary injection system (locked solenoids). The light came back on after the work with a few new codes and still won't clear with multiple resets. Earlier this year I had a fuel leak (corroded lines). And just this week the transmission has started slipping (no acceleration in 3rd and 4th). At this mileage, the clutch isn't a surprise, it is original.

What is happening here? Its pouring and my mechanic suggested I start thinking about a replacement. What is the experience on common issues with this age of a WRX? Things seem to be corroding and I am 2 months overdue on a sticker.
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Old 02-12-2019, 10:45 PM   #1554
Alittlewhitewagon
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Member#: 497709
Join Date: Feb 2019
Default Overboost code

I have a 2012 WRX with: Stage 2 accessport, turboback exhaust, cobb recirculating valve, Grimspeed air oil seperator, cobb light weight pully, cobb intake, cobb turbo inlet, and cobb boost control solenoid. (i have suspension mods as well but irrelevant)

I overboost if i make a pull in 4th or 5th gear WOT, Ive gotten to 21 PSI, at which point I get a CEL for overboosting. I am not sure why the car is doing this.
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Old 02-18-2019, 02:43 AM   #1555
ForeverAfflicted
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Member#: 497922
Join Date: Feb 2019
Default Misfire code

i have a 2008 WRX pretty much stock except what i believe to be an CAT back exhaust. It originally had a blow-off valve which i have removed due to the excessive air leak it was causing, and after that it threw codes for system too lean and misfire in 1,3,4 about 100km later. ive had it smoke tested and could find no further vacuum leaks, compression and leak down tested it last weekend and i believe the results to be good. since putting it back together after the tests there is no more lean code and it seems to consistently be codes for misfire in 1 and 4 but 3 would occasional pop up after a battery reset but go away later. looking for advice on what might be the cause, going to swap coils and replace spark plugs but plugs were replaced less the 15k ago, could bad gas or injectors cause this? i have a scan tool and getting very rich numbers from the o2 sensor and very positive short and long term fuel trims both at idle and 2500rpm.

any advice would be much appreciated

thanks
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Old 02-18-2019, 08:00 PM   #1556
CaptainSlowbaru
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Member#: 445600
Join Date: Apr 2016
Chapter/Region: Tri-State
Location: Rafferty Subaru, PA
Vehicle:
2002 Outback Sport
Green

Default

Quote:
Originally Posted by ForeverAfflicted View Post
i have a 2008 WRX pretty much stock except what i believe to be an CAT back exhaust. It originally had a blow-off valve which i have removed due to the excessive air leak it was causing, and after that it threw codes for system too lean and misfire in 1,3,4 about 100km later. ive had it smoke tested and could find no further vacuum leaks, compression and leak down tested it last weekend and i believe the results to be good. since putting it back together after the tests there is no more lean code and it seems to consistently be codes for misfire in 1 and 4 but 3 would occasional pop up after a battery reset but go away later. looking for advice on what might be the cause, going to swap coils and replace spark plugs but plugs were replaced less the 15k ago, could bad gas or injectors cause this? i have a scan tool and getting very rich numbers from the o2 sensor and very positive short and long term fuel trims both at idle and 2500rpm.

any advice would be much appreciated

thanks
Check the MAF... I bet it's filthy dirty. What is the a/f sensor reading? It should sit right at 1.00- maybe float from 0.99 to 1.01. If it's reading goofy numbers, it could be a bad a/f sensor, too. Keep us posted!
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Old 02-22-2019, 07:55 PM   #1557
SettleForSatin
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Member#: 486477
Join Date: May 2018
Vehicle:
2009 Impreza OBS
Black

Default

Vehicle: 2009 Subaru Impreza OBS (5 speed)
Mileage: 153,000

Problems: Car wouldn't start when half warm. Started up from cold (even at 10 degrees F), and started up from hot, but not in between. Would crank but not start until after at least a few attempts, and would be greeted with a CEL.
CEL code definition: Crankshaft Position Sensor

Fix: Replacing the old sensor with a new one. The thing was corroded in there pretty good. It was a pain to replace, but a few weeks later and the car is still working alright.
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Old 03-12-2019, 12:58 AM   #1558
Darynk99
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Member#: 498943
Join Date: Mar 2019
Default P0447 Code

Code came on my 03 WRX, catless exhaust, 170k miles, etc. where do I even start with this code (P0447)
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Old 03-21-2019, 08:42 PM   #1559
Jamiejo830
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Member#: 499374
Join Date: Mar 2019
Default 2008 Wrx

My car is throwing codes like it's in test mode, but I don't believe a 2008 has the green wires.
Any ideas for p0851 neutral safety, low voltage?
Have several bolt ons. FMIC, BOV, Headers, intake, exhaust. Currently just on Cobb stage 2+. Will protune once I clear up CEL and issues. Also, has 02 sensor codes.

Thanks for any help.
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Old 08-14-2019, 07:56 AM   #1560
Thrillz
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Member#: 299037
Join Date: Oct 2011
Location: NY
Vehicle:
2008 Impreza 2.5i 4d

Unhappy P0340 & P0420 Car is Dead

2008 Impreza 2.5 sedan
Stock exhaust and engine


Hey guys, sorry if this has been addressed already, but I didn't see anything directly relating to my problem and I am short on time.

My car died yesterday while driving in the middle of the interstate. I didn't hear any loud noises but the road noise was high. The car just shut off going up a bridge and I coasted to the bottom of the other side. When I turn the key it sounds like the starter is working but the engine isn't turning over. I thought maybe it had something to do with the timing belt but I haven't been able to look yet. I replaced it around 100K and the car currently has about 168K.

As far as the P0420 a few months ago the car was running rough and loud and I took it to a shop. The flanges just before the mufflers were rotted and they replaced them with some welded sections. Seemed to run fine after that up until now. The code started a little more than a week ago and I figure my catalytic converter is shot but it was driving alright.

Yesterday morning the P0420 code was still on when I drove to work (about 51 miles). When I parked the car it smelled hot. I checked the oil and it was low. I just did an oil change about a month ago, so something is leaking. I put more oil it in and got it where it's supposed to be. I was going to check it again when I got home but I didn't make it.

So my question is... are these things related? Where should I start? If I take it to a shop then it needs to be towed and I need to make sure they can do everything at once. If I try to diagnose it at home then I'm going to have to get a rental car. It's kind of hard to assume which will be cheaper. Some people tell me bolt on exhaust systems are something I could do myself in my garage, but I've never done anything on exhaust systems before. Any advice would be appreciated. Thanks!
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Old 09-15-2019, 08:48 AM   #1561
Shadowz Edge
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Member#: 506360
Join Date: Sep 2019
Default P1449 x3

P1449 x3: EVAP Code definition unknown to me.
2012 Impreza Hatchback FB20/CVT
31,000 miles (I'm the original owner)
Haven't fixed yet.

Driving along yesterday my CEL, TCL, and Flashing Cruise all started at the same time. Finally got the codes pulled on my scanner and found P1449 was in there 3 times. I had just filled up the day before so I checked the fuel cap but with a little research on here I ran across a possibility of a spider web blocking a vent of some kind. I have currently cleared 2 of the 3 codes as the 3rd one will not delete and my scanner says it's a permanent code. Where can I look to see if a spider has indeed built a web blocking that vent causing the code to set?

Thanks in advance everyone!
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Old 09-22-2019, 11:08 AM   #1562
Reddogg33
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Member#: 278746
Join Date: Apr 2011
Default

P0500 Vehicle speed sensor malfunction

2009 Subaru Sti hatchback

245000 km

Car threw this code randomly upon startup. I cleared the code and it was fine for a few days, but now it comes back everytime I start the car after clearing. The weird thing is that the car seems fine and the speedometer even still works. So my other problem is trying to figure out if my car has a vehicle speed sensor on the transmission or does it use the abs sensors as the speed sensor? I've searched online and keep finding conflicting info about this. And if my car uses the abs sensors how do I figure out which one is causing the issue?
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Old 11-04-2019, 07:40 AM   #1563
lxrubin
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Member#: 507566
Join Date: Oct 2019
Default

I have a 2008 Impreza 2.5L NA, ~220,00mi, 5 spd manual.

Yesterday it got a CEL for P0026 & P0028 (Intake Valve Control Solenoid Circuit Range / Performance Bank 1 & 2). I cleared the codes and haven't gotten the CEL back. Other than the light, I didn't notice anything wrong.
Additionally, the oil pressure light came yesterday, It was down a couple quarts. I had never checked it since I bought it, so not sure if it's a new issue...

Today it was cold, about 40įF, but not the coldest it's been lately. It was very difficult to start. I cranked for over 5 seconds. I tried to back out in reverse and stalled. I've never stalled the car before. It restarted fine and I pulled out by feathering the clutch. I didn't stall again, but I needed to slip the clutch more than usual. Driving to work, whenever I came to a stop and took it out of gear, the engine would drop below 500rpm and studder back to normal idle speed. When up to speed, I didn't notice a loss in power.

Does anyone know what might cause this? Are the CEL codes and the starting, low rpm issues related?

Last edited by lxrubin; 11-04-2019 at 08:38 AM.
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Old 11-05-2019, 07:44 AM   #1564
lxrubin
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Member#: 507566
Join Date: Oct 2019
Default

I think I resolved the issue, so I may as well post here. After doing a lot of research, I found that old dirty oil, or insufficient oil will affect the VVT system, throw those codes, and affect performance. I changed the oil and it appears that the performance has returned and there was no issue starting or idling today. While under there, it appears that the valve covers are leaking, or at least something from the area, and I'll investigate it further in the coming months. Until then, I'll monitor the oil level.
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Old 11-22-2019, 06:25 PM   #1565
Jml3837
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Member#: 508630
Join Date: Nov 2019
Default 2018 sti 18k miles p0302

I bought the new-to-me sti a week ago. Earlier in the week I got a p0340, camshaft position sensor. I got the CEL after a hit a pothole. The car didnít drive or sound any different. Erased the code and it didnít come back.

Today, just driving down a road in stop and go traffic, p0300 and p0302, cylinder 2 misfire. No change in performance or sound.

Taking it to the dealer on Monday. I hope this isnít a sign of things to come.
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Old 12-09-2019, 03:36 PM   #1566
Bishop
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Member#: 59993
Join Date: Apr 2004
Chapter/Region: International
Location: WWAAYY west of the Mississippi
Vehicle:
Ass, grass or cash
no one rides for free!!

Default

Quote:
Originally Posted by Shadowz Edge View Post
P1449 x3: EVAP Code definition unknown to me.
2012 Impreza Hatchback FB20/CVT
31,000 miles (I'm the original owner)
Haven't fixed yet.

Driving along yesterday my CEL, TCL, and Flashing Cruise all started at the same time. Finally got the codes pulled on my scanner and found P1449 was in there 3 times. I had just filled up the day before so I checked the fuel cap but with a little research on here I ran across a possibility of a spider web blocking a vent of some kind. I have currently cleared 2 of the 3 codes as the 3rd one will not delete and my scanner says it's a permanent code. Where can I look to see if a spider has indeed built a web blocking that vent causing the code to set?

Thanks in advance everyone!

Did you get this code figure out?
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Old 12-19-2019, 10:09 AM   #1567
kaiuchi23
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Member#: 486969
Join Date: Jun 2018
Chapter/Region: MWSOC
Location: Cincinnati, OH
Vehicle:
2007 Impreza 2.5i
Obsidian Black Pearl

Default P0442 Small Evap Leak - Part Number

P0442 - Small Evap Leak
2007 Subaru Impreza 2.5i Sedan, everything stock other than suspensions and wheels.

I've had the P0442 code for about half a year and I'm almost certain I just need to replace the Fuel filler neck since whenever I fill up my car fuel leaks from the rusted out holes from the top of the neck and I'm guessing some pressure is leaking from microscopic holes further down in the neck. No performance issues at all, cruise control is disabled. Replaced fuel cap and did nothing.
I've been searching for weeks but I can't come to a 100% conclusion on a part number for this stupid part.
Amazon says this: https://www.amazon.com/Spectra-Premi.../dp/B006GZAR4W fits the 07 2.5i but on parts.subaru.com it says the part number which the amazon one replaces doesn't fit. When I look on the subaru parts page though there are a couple different part numbers and different names for the same part and it's just confusing...

Can someone please let me know what the part number for the fuel filler neck, with all the components like in this video below, that I need actually is, or direct me to a thread where someone's already explained it?
Thanks!

Update: Filler neck didn't fix the issue :/ expensive... Ordered an OEM fuel cap to see if that will change anything because I only replaced it with an Autozone one...

Last edited by kaiuchi23; 01-25-2020 at 07:25 PM. Reason: Update
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Old 01-02-2020, 04:11 PM   #1568
SubieIOSGal
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Member#: 507436
Join Date: Oct 2019
Chapter/Region: Tri-State
Location: Earth
Vehicle:
2005 Impreza Otbk Sp
Silver

Default

Code: P0420 Catalyst System Efficiency Below Threshold (Bank 1)
Year/Make/Model: 2005 Subaru Impreza Outback Sport
Mileage: 108,208
Fix: No other codes appeared at any time. Several potentially-causal problems were fixed. The P0420 returned after each incremental repair. Eventually it was obvious that the cat failed. Have run through all possible causes over a 2-month diagnostic process. Included mechanical, air, fuel, and electrical systems in the diagnosis. The last thing left to confirm "bad or good" is the catalytic converter itself, which is confirmed bad after confirming the O2 sensors are working fine. Cat will be replaced next week.
Edit: Cat was replaced (Walker brand) and the code hasn't returned. Inspection tomorrow.
Edit again: Inspection successful! Happy camper here. Now I can concentrate on other cars.

Last edited by SubieIOSGal; 01-13-2020 at 12:43 AM. Reason: Update on status
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Old 01-13-2020, 12:33 PM   #1569
xA2D9
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Member#: 506331
Join Date: Sep 2019
Default

Code: P0420 Catalyst System Efficiency Below Threshold (Bank 1)
2006 Forester X
Mileage: 160k
Fix for problem: None

This one has been bothering me for a bit now because I cannot find the answers but....

Troubleshooting wise:
- Thermometer to cat shows 100+ hotter at outlet
- Scan tool showed almost 3v on upstream O2 (AFR) sensor
- Replaced front O2 (same readings)
- Checked old O2 (should have done before replacing) with volt meter it shows typical .000 to .900v range. accomplished using torch.
- 2.799v reading same when engine hot, engine cold, and when unplugged key on engine off

Im completely lost on why I am getting that voltage on that sensor in those situations, while driving I do have random spikes up to 5v and to throw another wrench in my confusion downstream O2 has relatively quick fluctuations from low to high but I think its something to do with upstream not reading properly
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Old 01-14-2020, 11:06 AM   #1570
foresterjj
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Member#: 510692
Join Date: Jan 2020
Default

Quote:
Originally Posted by outback2.5HO View Post

Connecting those wires will do nothing but make your CEL flash. On the OBDI cars (pre95) that was part of the self diagnosing computer, not on the later cars though. On your car, to the left of the steering column, on the lower side of the dash, will be a little door-type thing that flips down, that's where the OBDII port (plug in) is.
I am trying to fix a P1443 code on my 2002 Bugeye TS SOHC EJ251 NA and I looked under the dash and saw the green connectors already plugged in. Did my mechanic forget to unplug them? I have a third party alarm installed, might that require the green test connectors to be plugged in to work? I am trying to diagnose the rear vent control solenoid to the charcoal canister, but when I turn the key to ACC ON I hear NO clicking. The green connectors I mention look like the same shape as the ones I see on other forum posts, so I am 60% sure they are the test connectors, but I hear NO sounds or see any lights or fans turning on (and they have been connected without my knowledge for some time). Does anyone else have similar experience where the green connectors under the dash don't do anything?

Sorry for using reply to ask my question, new user can't make threads
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Old 01-20-2020, 10:59 AM   #1571
JustK3n
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Member#: 417929
Join Date: Apr 2015
Chapter/Region: SCIC
Location: So. California
Vehicle:
2006 STI

Default Code: PD DTC-1 / Will I pass Smog ?

I got the following code PD DTC-1 (fuel or air metering system problem), will my 06' STI pass the computer portion of Smog Test in CA?

I already checked my MAF and it's good, could it be my Stage 1 map, I have an Cobb SF intake / air box with a cat back exhaust. Thanks in advance for any help.
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Old 01-20-2020, 09:35 PM   #1572
benders
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Member#: 181247
Join Date: May 2008
Chapter/Region: MWSOC
Location: Freeport, IL
Vehicle:
2004 WRX Wagon
Silver

Default

Quote:
Originally Posted by xA2D9 View Post
Code: P0420 Catalyst System Efficiency Below Threshold (Bank 1)
2006 Forester X
Mileage: 160k
Fix for problem: None

This one has been bothering me for a bit now because I cannot find the answers but....

Troubleshooting wise:
- Thermometer to cat shows 100+ hotter at outlet
- Scan tool showed almost 3v on upstream O2 (AFR) sensor
- Replaced front O2 (same readings)
- Checked old O2 (should have done before replacing) with volt meter it shows typical .000 to .900v range. accomplished using torch.
- 2.799v reading same when engine hot, engine cold, and when unplugged key on engine off

Im completely lost on why I am getting that voltage on that sensor in those situations, while driving I do have random spikes up to 5v and to throw another wrench in my confusion downstream O2 has relatively quick fluctuations from low to high but I think its something to do with upstream not reading properly
Your scan tool may be interpreting the sensor reading to a 0-5 volt scale rather than give you the actual voltage. The spike to 5V could be when you're coasting and basically injecting no fuel and thus running super lean.

As for the downstream sensor, it's supposed to flip rich to lean. The catalyst operation requires it to "bank" some oxygen so it can complete the reactions it needs to.

My guess, you have a hole rusted in your exhaust upstream of the rear oxygen sensor. Extra air infiltrating the exhaust can cause a catalyst efficiency code.
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Old 01-25-2020, 05:12 PM   #1573
Angry04WRX
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Member#: 377703
Join Date: Jan 2014
Chapter/Region: South East
Location: Knoxville, TN
Vehicle:
2004 WRX
Java Black Pearl

Default

Is there a way to see which cylinder is experiencing a gross misfire without having data logging capabilities?
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Old 02-11-2020, 06:05 PM   #1574
LaserGecko
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Member#: 511595
Join Date: Feb 2020
Chapter/Region: SWIC
Location: Las Vegas
Vehicle:
2007 Impreza

Default Gas spills when pump shuts off - P0442

Hi there,

We bought a 2007 normally aspirated Impreza. The PO said that it would pass smog if you used a scanner and futzed with it enough. Well, yeah, that's a no. We can't get down to only one unset monitor without the CEL setting.

I had avoided filling it completely up since I feared we might have to drop the tank, but had heard that sometimes you can un-stick the purge valve by overfilling it. Figuring that I might as well try it, I let the pump run until full.

CLICK...sploosh...I think we found the leak!

It fills normally, so it's not a clogged charcoal filter or line.

I've looked at the fuel tank lines in the diagrams, but can't seem to suss out where I should be looking. The car is lowered (shocking, I know), so getting under there isn't the easiest thing right now. (Going to get the jack stands this evening.)


Can someone point me in the right direction as to where I should start looking? Everything I can see, touch, feel and point my phone towards while the car is on the ground looks good.

Thanks in advance!
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Old 03-03-2020, 11:36 PM   #1575
m1ss1on
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Member#: 499514
Join Date: Mar 2019
Default

Hello,

2016 sti
No CEL code and car starts and dies some times, after a couple tries ( About 5 tries, starts a couple seconds later dies) car runs fine no issues no CEL.

could it be possible to have a cam sensor or throttle body sensor go bad and no CEL

one thing to add car wont start at all without something being plug into obd2 pot
(AP, scanner)
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