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Old 01-08-2019, 11:51 AM   #1551
Justthetom
Scooby Newbie
 
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
Scooby Newbie
 
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
Scooby Newbie
 
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
Scooby Newbie
 
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
Scooby Newbie
 
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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