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204s 01-08-2013 05:37 AM

Help! Subaru Dealers can't fix my issue
I've got an 06 WRX Impreza Wagon with 96k miles that Subaru dealers can't figure out what is causing the issue. I have not modified this vehicle, maintained it well with all services, and have never taken it off road.

At the 75k mark, I received a check engine light giving a PO420
Catalyst System Efficiency Below Threshold error. I brought it in for service at dealer and they said it was an 02 valve issue and at the time it was under warranty and they replaced it with no charge.

The check engine light went away but came back on after another 8,000 miles, but as soon as I would get ready to bring it in to a shop it would go away for another 4 months. This on/off cycle repeated for the next 7000 miles, never staying on longer than a few days at a time.

At 90k mark, the check engine light stayed on permanently. Brought it into a different subaru dealer (I had moved to a different state) and had them do check the code - it was the same PO420 They said it was an O2 Valve causing the issue and the original dealer had not fixed it. I tried calling the original dealer but they said the fix was out of warranty. Spent 1500 for the 90k service and new O2 Valves.

Now at 95k the check engine light has come on again. Just checked the code - it's the same PO420...and a new issue has popped up on a cold start, the engine makes a loud fuzzy noise for about 1 minute (RPMs won't make it go away), and then disappears.
Had a mechanic look at it and he said all my belts look good.

Some questions:
- Do I need a new catalytic converter?
- Is the fuzzy noise maybe related to catalytic problem?
- Do I have a lemon? :(

Thanks in advance for anyone's help!!!

BLAZE2099 01-08-2013 08:22 PM

Sound clip may help us help you.
Did you buy this car at New?
If you bought it used, maybe some under hood shots would be of good use.

detrails01 01-09-2013 05:50 PM

a p420 code is usually always a bad cat. What is an O2 valve? Oxygen sensors were replaced?

06_hawk_eye 01-09-2013 06:20 PM

Yeah that code 9 times out of ten is a bad cat or a 02 sensor after the cat. Actually just did one today but on a 2010 Toyota. Replaced 02 sensor today and gonna see if the other code comes back if code comes back then it needs a cat

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jimbo058 01-10-2013 01:18 PM

Loud fuzzy noise when cold could be timing belt on the way out.

204s 01-15-2013 07:08 AM

Thanks for the response. Really appreciate it. Yeah, I bought it new, and had the O2 sensors were replaced.

I was hoping it wouldn't be the catalytic converter and timing belt. That's like a 3k fix. Almost want to buy a new car.

pzr2874 01-15-2013 11:59 AM

You can get the belt done for $600 (labor) from the dealer... and a Cat? Look into an aftermarket one. Even if in CA, you can't tell me you'd put a factory one back on?

204s 01-16-2013 08:36 AM

[quote=pzr2874;289724]You can get the belt done for $600 (labor) from the dealer... and a Cat? Look into an aftermarket one. Even if in CA, you can't tell me you'd put a factory one back on?[/quote]

Good tip. 600 dollars I can afford. Where's a good place to get an aftermarket Cat that would be reliable?

pzr2874 01-16-2013 12:16 PM

[url=]Catalytic Converter Reviews - Read Aftermarket Cat Converter Reviews[/url]

I don't have any other helpful info for you bud. Sorry about that.


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