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O2 sensor failure modes?
Hi folks,
Marvin decided to take a funny turn and run like a bag of nails, one of the codes I'm getting if for the O2 sensor, a code 21, which on this model year appears to mean that the O2 voltage value is stuck in the middle somewhere.
I'm thinking "what the hell?, don't they just fail lean???" so this seems highly bizarre. There's other codes for constant rich or constant lean. I realise of course that this might not be the O2 sensor per se but some other fault, particularly as I'm getting a code for the speed/distance sensor at the same time.
Some sources say for 90 up the code means O2 sensor "stuck at value" and no mention of whether it's middling high or low. Either way, seems very odd I'm not getting a code for constant lean or constant rich as well if that's the case.
Really don't have much of a clue what's going on yet, I'm suspecting an issue in the speed/distance sensor circuit that shares a signal ground with the injector timing, TPS etc, that is taking out the SDS and buggering up the fuelling.
Any clues greatly appreciated.
Road Warrior
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I remember The RoadWarrior..To understand who he was, you have to go back to another time..the world was powered by the black fuel & the desert sprouted great cities..Gone now, swept away..two mighty warrior tribes went to war & touched off a blaze which engulfed them all. Without fuel, they were nothing..thundering machines sputtered & stopped..Only those mobile enough to scavenge, brutal enough to pillage would survive. The gangs took over the highways, ready to wage war for a tank of juice
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GasSavers_RoadWarrior 
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