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Re: Can bad O2 sensor kill AMM or v v? Posted by RS [Email] ![]() ![]() ![]() In Reply to: Can bad O2 sensor kill AMM or v v?, kyle morley, Fri, 8 Apr 2005 04:59:25 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The AMM has probably been slowly going bad for years. When the O2 sensor bought the farm, the ECU was unable to mask the AMM's deteriorated condition with O2 sensor process feedback.
You didn't mention how many miles the car has on it, but there is a finite lifespan for O2 sensors before they get coated and slow down or stop altogether.
There's no physical or process connection from the O2 sensor back to the AMM; the ECU just takes their signal inputs and changes the injector timing as necessary to make the signal from the O2 sensor oscillate around 0.5 V.
Underhood conditions are about as unfriendly for electronics as you can get, short of being located next to a jet engine or a van der Graff generator. You have a combination of heat, moisture, and vibration that start the electronics on their journey south from the first drive off the pier.
Now, it is possible that an AMM could give the ECU a false high flow reading that would make the engine run rich and coat the sensor, but the plugs would show that rich-running condition.
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