O2 sensor....

[TURBOV8R]

Wife's got an '04 GTP and a PO135 and a PO035 code popped up.Where exactly is the 02 sensor in these cars? is there only one...I HOPE?

 

[murphinator]

2 sensors total

1 in the rear exhaust manifold which is the business one that all pcm calcs are based off of ( front & rear banks both rely on this one- bank 1 sensor 1)

the other 02 sensor is post cat at the " u bend " which is the big exhaust restriction on these cars just previous to the catback flange , this sensor is basically to monitor that the cat is doing its job

 

[TURBOV8R]

Thanks!! Found that one fairly easy,but wanted to make sure there wasn't another lurking elsewhere.