I have an 01 Camaro SS ls1 and I've had it about 8 months. When I picked it up I knew the previous owner had abused it! But it seems like everything I fix more comes up!
it has 92k and the plugs and wires had never been changed. So I did a tune up plugs wires, intake gasket, all fluids and cleaned the slp mass air flow, throttle body, all connectors and it was running great!! Now my check engine light is on. 3 codes came up
P0141, p0161 and p1637. The first two say downstream o2 sensors? Could that be cause from the after market mass air flow? And the third one is something with alternator but it tests good?

Any help will be appreciated!!!!
thank you in advance

 

No. The O2 sensor is bad. Replace it, or have it tuned out. It is not essential for good performance.
See what that does for performance, then if the alternator code persists, you will have to dig deeper.

 

What kind of test did you perform on the alternator? Also be sure you connected all your plug wires well if you have loose ones you could not be getting spark and your o2 sensors will be reading that way because you have "rich" condition because the fuel is not burning at all or is not burning completely. You can also check for terminal tension on the coil packs if you diabled those while replacing your plugs. Or it could be excessive spark plug gaps. I wouldn't jump straight to replacing the sensors without checking that first. That just sounds like something a dealership would tell you to do :S. No offense.

 

I used the tester at kragen. And ill check to make sure my wires are snapped on all the way. And the plug gap is normal

 

Idk what that is do they use a vat machine there or just a diode tester? Did you have the codes before you did the work to it?

 

I only had the alt code before hand

 

Hook a dmn up to the positive and neg terminals on the battery and check for ac voltage to make sure your diodes are working correctly. Find anything with your wires?

 

What's a dmn and the wires are fine

 

Digital multi meter.

 

It's gotta be something you did. Is it both downstream sensors or just one?