No codes but something is def wrong!

Wilson2608

It's easier to find out what's going on if you have a scan tool you can look at the short term fuel trim that's will tell you what the ecu is telling the motor to do(add or take away fuel) depending on if your running lean or rich. This should help eliminate a few variables

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Stillen G3, z1 Intake Manifold, Stillen Headers, Z1 HFC's, Stillen Catback. 330whp 267 ft- lbs tuned at Z1 motorsports.

shishka

Actually shortly after getting the Bank 1 CEL, I got the Bank 2 as well... He said it was very unlikely that my cat is going bad at 50k. Does that help narrow it down?

By scan tool, do you mean OBD2? I use the Torque app although I'm not an expert at it.

Wilson2608

I know you said the cats shouldn't be going out but are you sure it's not the sensor at the header? What is the code that was thrown? just wanna be positive we're talking about the same sensor.

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Stillen G3, z1 Intake Manifold, Stillen Headers, Z1 HFC's, Stillen Catback. 330whp 267 ft- lbs tuned at Z1 motorsports.

shishka

Sorry, the recent codes were different. P0420 and P0430 ("Catalyst System Efficiency Below Threshold" at Bank 1 and Bank 2). He said it's unlikely that both sensors went out, which makes sense.

Gotta be air/fuel mixture...?

Wilson2608

Yes he is right it is unlikely both went out at the same time. If it is a issue with air fuel ratio it should be throwing a different code saying rich or lean. I suspect either electrical issues with those sensors or maybe (even though unlikely) both cats went out. I agree with trying to take it to a different mechanic maybe he will know.

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Stillen G3, z1 Intake Manifold, Stillen Headers, Z1 HFC's, Stillen Catback. 330whp 267 ft- lbs tuned at Z1 motorsports.