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Discussion Starter #1
2000 2.2 automatic 177 k tired of fighting the P0140 code. Any recommendations on an O2 simulator for this vehicle?
 

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IF the sensor and wiring are good, take a look at your MAF sensor. There has to be a reason you are getting the code.
Finding away around it isn't going to fix the problem.
 

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Discussion Starter #4
Thanks for the reply but a 2000 2.2 doesn't have an MAF all it has is an M A P sensor which has been replaced. I would rather fix it then fool it and I'm getting down to the really expensive parts now like the ECM converter and the ICM.
 

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If the engine is running way rich or way lean the rear O2 will nail at .1v or .9v, confusing the ECU. This sensor is there only to monitor the efficiency of the catalytic converter. The front O2 (bank 1 sensor 1) voltage regulates the fuel trim. Watch O2(1) to see if it responds when you gun the accelerator. Also watch the Short and Long Fuel Trims. Negative indicates rich (high fuel pressure, leaky injector and positive fuel trim could be intake manifold or exhaust manifold gaskets or cracks. Normal FTR is -5 to +5.
P0140 - CHEVROLET - O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2
Rear Heated Oxygen Sensor Bank 1 harness is open or shorted - Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection - Faulty Rear Heated Oxygen Sensor Bank 1 - Inappropriate fuel pressure - Faulty fuel injectors - Intake air leaks - Exhaust gas leaks.
 
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