Chevy Silverado
Check Engine Light
Ford Explorer Sport

Why would your Check Engine Light come back on even though you have replaced the O2 sensor and cleared the code?


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Wiki User
2005-02-03 22:43:03
2005-02-03 22:43:03

Pull the codes from the computer, match the code to the troubleshooting procedure, follow the procedure to find the source. Repair the source, light will go out if that was the only problem. There are "monitors" or self test the computer runs the car through, if a problem occurs, it may not run all of the self tests until that problem is taken care. Therefore, another problem may exist. It is emission related.


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Have the code read. Autozone will do this for free. Even though the light is not on now. It will be stored as a recent code. It has to cleared to be erased completely. Good luck. i had the same problem with mine it turned out to be the knock sensor i replaced it and the problem went away give that a try

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When this happened to me on my seven year old 2.2 DCi laguna I had to hae taken in to the Renault dealers. It turned out to be the a problem with both the cam sensor and the fuel injection sensor. Both had to be replaced at a cost 0f £300 in all. It did cure it though! May also be TDC / crank sensor. Worth removing it and giving it a clean.

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You need to reset the light by using diagnostic equipment even though the part was replaced the fault code will still be stored in the ECU memory.

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Depending on the year it could be in the distributor or by the crank's pulley. On 93-98 Honda passports with the 3.2l engine the crankshaft position sensor in located on the passenger side of the engine near the engine mount. 93-95s did not have the camshaft sensor though. that was added in 96 and is located on the d/s valve cover in the outside upper corner

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