The car hesitates when cold for about the first 1-2 minutes. It also has trouble under hard acceleration (hesitates). I have a good mechanic that I trust. He already replaced the O2 sensor indicated by the error, however the car is still throwing the code. He just ordered another sensor and put it in. Same thing. He's convinced the issue is with the ECM because when he drives the car after ECM reset the monitors fail to set, and then the things throws the P0135 code.
I'm not convinced the problem is the ECM, because if that were the case the car would not run at all. A partial ECM failure seems extremely unlikely.
He has also checked the wiring to the O2 sensor. I am considering getting the car back, and checking the voltages and resistance of the new sensor. I'm also considering the possibility that this could be due to a MAF? I'm quite close to saying f*ck it, and taking it to the dealer.
Any suggestions, greatly appreciated.
I'm not convinced the problem is the ECM, because if that were the case the car would not run at all. A partial ECM failure seems extremely unlikely.
He has also checked the wiring to the O2 sensor. I am considering getting the car back, and checking the voltages and resistance of the new sensor. I'm also considering the possibility that this could be due to a MAF? I'm quite close to saying f*ck it, and taking it to the dealer.
Any suggestions, greatly appreciated.