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Advice needed! CEL P0140 O2 Circuit
Posted by Noel (more from Noel) on Sat, 11 Apr 2015 11:09:05
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My '96 9K threw a CEL today: P0140 O2 Circuit, No activity detected (Bank 1, Sensor 2).
Does this mean the sensor at the cat? I replaced the front sensor about 9 years ago at 129K, we're now at 222K.
I cleared the code and it came back after I ran a few errands. Gas mileage is more or less normal. When the other sensor failed mileage went to about 18 highway.
I know where the sensor is, so how hard is this one to replace? Any gotchas? My indy did the other one as it was winter and he did other stuff while it was in the shop. Looks like I now have a reason to buy an O2 socket tool!
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