After having the engine out to fix a fault in the gearbox, the "service engine soon" light stays on. How do you switch it off? The car is going well, there is nothing wrong, all I wish to do is to switch the light off!
I am by no means a mechanic, but my car is in the same state at the moment. My car runs good and everything is working fine. The only way to find out what is wrong is to have it hooked up to a diagnostic machine. It costs about $100 dollars at the mechanic. Probrobly a sensor that may need to be replaced. Mine is a failure in the Cam sensor connection.
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Check engine lights report faults in engine AND gear box(auto). If you have changed from an auto to manual gear box then the sensor system for the gearbox is recording a massive fault with the gearbox that you have to check out. Talk wit an accredited auto electrician as to how to neutralise the system so that the light only checks out the engine.
Code P0705 - Transmisson Range Sensor Circuit (PRNDL Input) The transmission range switch detects the selector lever position and sends a signal to the TCM.
The park/neutral position (PNP) switch includes a transmission range
switch. The transmission range switch detects the selector lever
position when the shift lever is in the N or P shift position and sends a
signal to the Transmission Control Module (TCM).
Symptoms - Engine Light ON (or Service Engine Soon Warning Light)
Possible causes - Open or short park/neutral position switch circuit - Poor park/neutral position switch circuit connection - Misadjusted park/neutral position switch - Park/neutral position switch may be faulty
The Service Engine Soon light comes only when the engine computer control unit (called the PCM) senses a fault in the electronic controls of the engine and/or the emission system, it is not related to the oil change, there are about 200 possible faults that turn the light on, to know what has developed a problem you must have the system tested, this is called an OBD2 fault code test, Kragen and Autozone parts stores do this testing for free.