2003 Buick Regal LS

[Captainclock]

Originally Posted by dishdude

What code is it throwing? P0420 is almost always a bad cat.

Well That's the thing I don't know what the code is, I never saw what the code was when they tested it at Auto Zone and they didn't tell me what the code was at the Mechanics shop either, but all I know is that from what I read online is that the Rear Oxygen sensor and the Catalytic Converter share the same code on the 3800s, at least on the Series II 3800s anyways.

[davet753]

Originally Posted by Captainclock

Well That's the thing I don't know what the code is, I never saw what the code was when they tested it at Auto Zone and they didn't tell me what the code was at the Mechanics shop either, but all I know is that from what I read online is that the Rear Oxygen sensor and the Catalytic Converter share the same code on the 3800s, at least on the Series II 3800s anyways.

That reminds me, P0420 was the code mine always had.

[Captainclock]

Originally Posted by davet753

That reminds me, P0420 was the code mine always had.

Hmm, interesting, could it be that perhaps the computer on the car has some sort of issue that's causing it to throw codes randomly when there really isn't any issues? Just wondering because my car runs fine and gets fairly decent gas mileage for the type of driving I do (which is mostly city driving with a little highway driving occasionally).