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Old May 28, 2021 | 12:27 PM
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pizzaguy
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Joined: Jun 2009
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From: Fort Worth, Texas
Default Re: opinions wanted please...

Cylinder 2 is the middle one, passenger side.

Those two O2 sensors are fed from separate power feeds, so there is no common path to THOSE two, the upstream sensors are powered together and the downstream sensors are powered together, but you have the upstream and downstream on one side failing at the same time. Very odd.

The fact the ECU detected a misfire on the 1st bank, apparently at the same time as 1st bank O2 sensors failing, does not mean that ONLY that side had an issue, it's just that the ECU only caught it on one side.

Its fine to drive the car, but I don't trust the car now, and neither do you. "No activity" would imply there was no return signal from the sensors, but again, if power to the sensors failed, the sensors on the other side would have failed, as they are powered from the same sources.

I hate to go there, but how old is the battery? More questions: Was this car stored this winter? Have you observed any odd behavior when starting the engine?
 
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