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Re: check engine codes 13,14
You don't say what code came back, the 13 or 14?
As I said there is only one way to check an O2 sensor, and that is with a scan tool......
First, you start the vehicle, and then disconnect the O2 sensor....the scan tool reads around 450mv......now install a jumper in the harness side to the ECM.....grab the other end of the jumper with one hand, and then with the other hand, touch the neg terminal of the battery....scan reading should drop towards 0.100mv.....now touch the pos terminal.....should go to 0.900mv....if it does, the circuit to the ECM is ok...if it stays at 0.450, you either have a bad circuit to the ECM, or bad ECM, or bad sensor ground to the ECM....
Now attach your new O2 sensor.....it should be constantly changing(once it warms up) above and below 0.450mv.......if it isn't, then there is a problem.....a vac leak could cause it to run constantly lean(especially one near the exhaust)......a rich condition could cause it to constantly read above 0.450(like a dirty air filter).....
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