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Old 10-15-2012, 04:06 PM   #1
Djimpreza02
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Angry Oil change, and Invidia N1 = code?

Put a Invidia N1 catback exhaust on Fri, and I did unhook the battery neg side for about a half hour.

And then yesterday, I did a oil change with 5 QT's of Rotella T6 5w-40, and a oil filter from Subaru.

Today my GF gives me a call and says the check engine light is on, she says it's driving fine, not overheating, and the boost gauge is acting normal.

I'll have the code number later tonight when she stops at a Advance auto parts, but any idea's until then?

The car is a 2004 WRX 5 speed.

Dj
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Old 10-15-2012, 04:45 PM   #2
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Google it!!
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Old 10-15-2012, 04:56 PM   #3
Djimpreza02
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Gave it a try, a lot of places trying that sell invidia N1's came up.

But I did find one thread with a guy who had a few more mods, but he said after he put it on, he got a code for the Intake Manifold Runner Position Sensor?
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Old 10-15-2012, 08:16 PM   #4
lavid2002
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Doesn't mean the c.e.l. is related to the oil change or the exhaust.

What exhaust did you install? Cat back i'm guessing?

Just scan the code.


Right now your saying, somethings wrong with my car. Guess what.
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Old 10-15-2012, 09:20 PM   #5
Djimpreza02
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Invidia N1 Catback.

And sorry, the codes should be here soon.
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Old 10-15-2012, 09:28 PM   #6
Djimpreza02
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Okay, it says:

P0420 - Catalyst efficiency below threshold- bank 1.

The print out from autozone say for probable causes:

1. Rich A/F Ratio.

2. Ignition system malfunction.

3. Faulty catalytic converter.

So what's going on here? Is a o2 sensor going bad?


And is it safe to drive until I can get this fixed?
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Old 10-15-2012, 09:41 PM   #7
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I know you said you installed a 'cat back' exhaust system, but just curious does your vehicle actually still have a cat or do you have any kind of catless downpipe on there?
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Old 10-15-2012, 09:48 PM   #8
Djimpreza02
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The downpipe has never been removed.

Everything before this Invidia catback is stock.
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Old 10-15-2012, 10:53 PM   #9
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Find someone local who has a tactrix cable to clear the code for you. No biggie.
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Old 10-15-2012, 11:09 PM   #10
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Just get a tune
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Old 10-15-2012, 11:37 PM   #11
Djimpreza02
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Yea but when reading through stickies, I read that I only need a tune if I did the downpipe.

Now the Invidia N1 is 3 inch piping, to a 4 inch tip. Would that have anything to do with it?


And would you say it's safe to drive as long as I take it real easy, until the light goes off?


Thanks for helping guys.
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Old 10-15-2012, 11:49 PM   #12
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Old 10-16-2012, 12:04 AM   #13
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Thanks, I might put her back up in the air and check out that nasty ring right before the cat, I reused it, and tightening it might fix any possible leak, as that link suggest it could be that as well.
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Old 10-16-2012, 09:14 AM   #14
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"Before" the cat??
What?

Your car has 3 catalytic converters.
1 pre cat in the up pipe between the manifold and the turbo
2 in the downpipe (Downpipe is one piece)
none in the cat back

You could even run an open downpipe and not throw a check engine light (Ask me how I know)

So the gasket you used in between the downpipe and the cbe shouldn't be throwing a code. Did you accidentally nick the rear 02 sensor?


That rear o2 sensor is what determines the "efficiency" of the catalytic converter.
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Old 10-16-2012, 04:16 PM   #15
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This is a 04, it does not have the cat on the up pipe. All I have is the two on the down pipe.(IIRC)

And I was careful when working near the rear o2, but It's worth checking for visible damage.

Anything else I can visibly check that would throw the code?
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Old 10-16-2012, 04:24 PM   #16
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if the rear o2 is bad find someone local to delete the code in the rom and call it a day. the rear o2 doesnt do anything important you will ever need
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Old 10-16-2012, 07:09 PM   #17
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The rear 02 is a oxygen sensor, correct?

I'll want to replace it sooner or later, but it is nice to know it's nothing that going to hurt the car.


EDIT: And after reading through many reports on this forum of P0420, it could be multiple things, but the o2 sensor is most common, and my non loss of MPG furthers my theory of the o2 sensor.

I will bring it to a guy I know down the road, and have him hook his $1800 scanner to it, I'm thinking if it is the o2 sensor, he would be able to tell me indefinitely with his scanner?

Last edited by Djimpreza02; 10-16-2012 at 08:00 PM.
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Old 10-16-2012, 08:51 PM   #18
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Yea, it sounds like the 02 sensor. Mine threw that same code and the 02 sensor was the issue.
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Old 10-16-2012, 08:55 PM   #19
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Yea, it's also the fact of when I installed the Invidia N1 exhaust, I had to drill the old flange holes out for the bigger bolts that came with the cat-back, so that sensor might have got a good shaking, for about 15 mins.


Also if it was a clogged cat, or bad ignition coil/spark plug or something like that, gas millage would be noticeably affected, and for something like the cat or a plug, it would affect HP greatly. I would imagine that it would throw it into safe mode for some certain things.


BTW:
If mods want to, change the title to "P0420 problem", so on searches it comes up with the many others.

Last edited by Djimpreza02; 10-16-2012 at 09:24 PM.
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Old 10-17-2012, 04:33 PM   #20
Djimpreza02
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Okay, my local Subaru dealer wants $160 for the oxygen sensor.

It there a good name brand out there that's cheaper?
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Old 10-17-2012, 04:59 PM   #21
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Why spend $160, the rear O2 isn't doing anything for u. Buy a guy a beer or lunch to hook their tactrix cable up and delete the code. Won't come back on again, won't cause any problems, will save u $$$. Seriously don't replace, just delete.
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Old 10-17-2012, 06:17 PM   #22
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Okay, but do most mechanics have a tactrix cable? And will it still pass emissions?

I've never heard of that kinda cable?
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Old 10-17-2012, 06:42 PM   #23
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Post in ur local forum asking for someone to help u. Mechanics most likely wont have one unless u went to a tuner. U can also search the classifieds or buy one online.
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Old 10-17-2012, 07:00 PM   #24
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Quote:
Originally Posted by Djimpreza02 View Post
Okay, but do most mechanics have a tactrix cable? And will it still pass emissions?

I've never heard of that kinda cable?
my last 3 cars had the rear o2's deleted. no biggie on emissions, just reads ready no report. Get it tuned out and be done. if your cat is going, you'll know it.
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Old 10-17-2012, 07:02 PM   #25
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Quote:
Originally Posted by Djimpreza02 View Post
This is a 04, it does not have the cat on the up pipe. All I have is the two on the down pipe.(IIRC)

And I was careful when working near the rear o2, but It's worth checking for visible damage.

Anything else I can visibly check that would throw the code?
Wrong.

The catted up pipe didn't change until 06.
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