P0156

[joserw]

I just took off the highflow cats (althought the tune still has them programed in) and put the stock H-pipe back on the car. The stock H-pipe was fine when it came off and just sat in my garage so I don't think the cats are bad. Anyway I am getting a P0156 code now... I replaced the passenger side rear O2 sensor... I just want to confirm I replaced the right one and see if anyone else knows what the problem could be.

The CEL comes on with the stock tune installed too.

 

[trinity_gt]

P0156 refers to the downstream sensor on bank 2 which is the driver's side.

 

[joserw]

That would be the problem then wouldn't it. Thank you.