UA6 BALLER STATUS

Well my TL has 120,xxx miles and I haven't been driving it much at all, what would you guess the problem is?

I have a code reader and CEL is a P0420 Catalyst System Efficiency Below Threshold (Bank 1)

Uncle Ben's

Precat has gone bad. Bad O2 sensors have their own codes. Good news is RV6 performance makes a pair of high flow cats based on 200 cell Magnaflow universals that cost the same as one OEM catalytic converter. Bad news is one OEM cat costs $500-$600 and you're gonna wanna replace at least the O2 sensors on the rear bank while they're out, which are about $150 a piece. Only buy Denso, the Bosch ones will be trashed at the very first sign of simple misfire due to tune up (ask me how I know).

UA6 BALLER STATUS

now after the car was sitting, I drove it and now the CELL is off. seems fine now, what should I do?

Uncle Ben's

Keep driving it for now lol. I reset my ECU a few times when I had the P0430 (the other bank) and it kept coming back shortly afterward. So I really doubt you'd reliably be able to pass emissions, because it will come back before the ECU is "ready" if it is like mine was. But you might be getting lucky. From what I've seen in the forums, this code and its sister normally mean new cat. And IIRC this code is for the rear one, which is about three hours labor time for a shop to do since they have to take off so much **** to get at it.

Edit: scan your ECU again, the code may still be stored, which still = failed emissions. All I remember with my ordeal was that I could get my CEL to turn off, but couldn't pass emissions until I replaced the ******. Better luck to you.

UA6 BALLER STATUS

Thanks, I appreciate the insight, yeah hopefully it doesn't come back. :crossesfingers: