I've solved all the issues related to my check engine light on my 1996 nissan maxima. Replaced knock sensor, O2 sensor, tune up etc. Now I can't clear the check engine light. The codes have been cleared.
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If the car is pinging you will set a knock sensor code.'
This comes from bad gas and running lean., You really need this professionally inspected to rule out the basics. I have seen alot of nissans with the knock sensor code stored but the light is still off.
Fill up the tank with high octane chevron and some techron injector cleaner and clear the light. If it stays off for a couple days then go get it inspected. Even if the code is stored it will still pass as long as the light is still off and the monitors have run.
The Crankshaft Position Sensor is located:
Under hood, driver side, front engine area, mounted rear of crankshaft pulley
The Knock Sensor is located:
Under hood, center, front engine area, below intake manifold, mounted on block
1) You better check the 'Idle control relay' - and pray this is not your computer - who may be shorted ( The Computer that govern all elec. functions in the car - is also getting signals from your Mothor Mounts' to ensure a more balanced ride'
If one or more of the Motor Mounts ( There are 3 ) are defective - they send a signal to the computer - and the yellow light ( Check engine soon) - will appear'
2) A Computer can only be fixed by a Nissan dealer ( est. $750 )
3) The Idle control valve - can be adjusted too ( Again - by a Nissan Dealer only .
4) It is NOT an easy problem nor cheap . In short - your best bet is with the dealer - and ask them for a diagnostic ONLY ( est. $100 )
Don't tell the dealer what YOU think or did .......just tell them the 'Yellow light comes on' .......they'll take it from there.
Sorry I don't have better news today .
There is no way to fix this issue according to my Nissan Dealer Service Manager. The monitors will not run and therefore the vehicle will not pass smog. If you need assistance from California's SMOG authority they are called "The Referee" and you can call them at 1-800-622-7733.