Originally Posted by
pizzaguy
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?
Thank you for your comments and questions. I learned from your logic or pointing out that what happened had logical inconsistencies.
The 2 cats and 3 O2 sensors were replaced 2 years ago. 1 O2 sensor is old but I don't remember if it is the front or back sensor.
The car has been stored for about 5 months with a trickle charger and the battery is five or six years old. I admit to be somewhat unobservant but everything seems normal to me and I just had the car out the day before for a 100 mile drive. I got gas yesterday. If dirt stuck in the injector of cylinder 2 and then cleared itself cause this problem? Do I need to replace the camshaft position sensor and or the crankshaft position sensor?
I would rather put in a new battery or do whatever is needed than get stuck by the side of the road in the rural mountains of NH where I might not have cell signal to call for help.....Even the downtown of the town where I live has no cell service!