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Car Forum / Chevrolet / Chevrolet Trucks / August 2006O2 Sensor Problem in 97 Geo Prizm
The check engine light came on in my 97 Geo Prizm. The code was P0141 (O2 Heater Circuit (Bank 1, Sensor 2)) and the Chilton manual said that that was the post-convertor O2 sensor. It had a little diagnostic test I could try and so I tried that out and according to the test it was bad. I replaced the sensor on Saturday, but then today on the way to work the check engine light came on. It was the exact same code. Does anyone have any suggestions on what the problem might be? Thanks, Dave This problem is very common on European cars. I haven't seen it in a lot of Japanese cars like yours, but I have on some of the higher end ones. A lot of the time the front 02 sensor starts to go bad, but does not set a light. The incorrect information it sends to the computer changes the way the engine runs and leads to the destruction and/or degredation of the rear 02. Sometimes the front 02 is going to hell and that condition is manifested by a trouble code in the rear 02, which is picking up bad air mixtures from the cat because the engine is running too rich or too lean (in this case there's nothing wrong with the rear 02 and it probably doesn't need replacement). Either way, I would suggest starting with the front 02, even though that's not what the code suggests. Dave D > The check engine light came on in my 97 Geo Prizm. The code was P0141 > (O2 Heater Circuit (Bank 1, Sensor 2)) and the Chilton manual said that [quoted text clipped - 5 lines] > Thanks, > Dave Cool. Thanks for the info. Unfortunately, I already replaced the rear one, so too late for that, but I'll check the front one and see if that's the problem. Thanks again for the advice. Dave > This problem is very common on European cars. I haven't seen it in a > lot of Japanese cars like yours, but I have on some of the higher end [quoted text clipped - 20 lines] > > Thanks, > > Dave > This problem is very common on European cars. I haven't seen it in a > lot of Japanese cars like yours, but I have on some of the higher end [quoted text clipped - 10 lines] > > Dave D well, kinda, I guess. What you describe could happen but it most likely will degrade the cat not the rear sensor. What happens is the front O2 gets weak which makes the car run a little rich. This will ruin the CAT. You would then get a code for cat inefficiency because of the rich mixture, over time, killing the cat. Either way, sounds like his code was the rear O2 heater circuit, not O2 per say. Ya, the code was for the post-catalytic converter O2 sensor. Dave > > This problem is very common on European cars. I haven't seen it in a > > lot of Japanese cars like yours, but I have on some of the higher end [quoted text clipped - 17 lines] > mixture, over time, killing the cat. Either way, sounds like his code > was the rear O2 heater circuit, not O2 per say. > The check engine light came on in my 97 Geo Prizm. The code was P0141 > (O2 Heater Circuit (Bank 1, Sensor 2)) and the Chilton manual said that [quoted text clipped - 5 lines] > Thanks, > Dave If the code is the HEATER CIRCUIT then check the wiring for being burned to the exhaust or the like. Then check the fuses, I think that car will use 12v from the fuse box for the O2 heater. If you car is a 4 cyl it will only have 2 O2 sensors. Sensor 2 is the rear (after cat) sensor. |
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