CEL and no acceleration

NissanZ34 · 07-23-2021, 07:30 PM

Went to the dealership and the technician verified the harness and it's working. o2 sensor wiring is good too, but the problem may be the o2 sensors themselves (both of them). That or it could be a damaged ECU or a flawed tune. Remind you the tunner wanted to deactivate o2 sensor reading to bypass the issue. Could my problem really be two broken o2 sensors? The technician told me it's very unusual to have both o2 sensor break at the same time.

As for testing the car after the dealership appointment, on cold start temperature the power was back but as soon as the engine gained some temperature it got slow again. I also got the service engine light soon flashing for a brief moment when trying to get to max rpm in 4th gear. The light disappeared as soon as I let off throttle. The technician told me the computer does not read o2 sensor data when the engine is cold but will do once it gets warmer. I think I also got in limp mode because I could barely get to 3000 rpm at one point.

So do you guys think the problem really is the o2 sensors? Dealer will happily sell me OEM sensors but will not accept any return on electronic parts so I must be certain otherwise I'll be stuck with them.

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07-23-2021, 07:30 PM	#17 (permalink)
NissanZ34 Base Member Join Date: Jun 2019 Location: Canada Posts: 92 Drives: 2010 370z 6MT Rep Power: 7	Went to the dealership and the technician verified the harness and it's working. o2 sensor wiring is good too, but the problem may be the o2 sensors themselves (both of them). That or it could be a damaged ECU or a flawed tune. Remind you the tunner wanted to deactivate o2 sensor reading to bypass the issue. Could my problem really be two broken o2 sensors? The technician told me it's very unusual to have both o2 sensor break at the same time. As for testing the car after the dealership appointment, on cold start temperature the power was back but as soon as the engine gained some temperature it got slow again. I also got the service engine light soon flashing for a brief moment when trying to get to max rpm in 4th gear. The light disappeared as soon as I let off throttle. The technician told me the computer does not read o2 sensor data when the engine is cold but will do once it gets warmer. I think I also got in limp mode because I could barely get to 3000 rpm at one point. So do you guys think the problem really is the o2 sensors? Dealer will happily sell me OEM sensors but will not accept any return on electronic parts so I must be certain otherwise I'll be stuck with them.