: o2 sensor problems



96caddie
03-19-04, 01:36 PM
i replaced my n* engine in my 96 seville sts. now i have o2 sensor problems, i replaced all of them, changed the cat, checked egr valve and all wiring/hoses over and over. im getting a couple of different codes. bank 2 sensor 1/ no activity/low heater voltage same with bank 1 sensor 1 and 2. but bank 2 sensor 2 seems to be fine. the engine runs fine, sometimes a little rich and gas mileage is sometimes bad, but you can still feel those 300 horses when you put the pedal to the floor. some times the codes are current and sometimes their not. all three of the sensors are never reading bad at the same time. please help before i drive it off a cliff! also can you eliminate the cat without confusing the computer? thanks

BeelzeBob
03-19-04, 02:51 PM
i replaced my n* engine in my 96 seville sts. now i have o2 sensor problems, i replaced all of them, changed the cat, checked egr valve and all wiring/hoses over and over. im getting a couple of different codes. bank 2 sensor 1/ no activity/low heater voltage same with bank 1 sensor 1 and 2. but bank 2 sensor 2 seems to be fine. the engine runs fine, sometimes a little rich and gas mileage is sometimes bad, but you can still feel those 300 horses when you put the pedal to the floor. some times the codes are current and sometimes their not. all three of the sensors are never reading bad at the same time. please help before i drive it off a cliff! also can you eliminate the cat without confusing the computer? thanks

Did you use OEM sensors or aftermarket ones?? Many of the aftermarket O2 sensors are simply not compatible with the OEM electronics especially on the 96 and later OBD2 cars.

If you eliminate the cat it will set a continuous "catalyst efficiency low" SES light.....no way around it.