Coolant sensor was replaced still get check engine light
I took my navigator to advance auto to diagnose a check engine light problem. It said the coolant sensor needed replacing. I replaced it and that seemed to correct the fault. About two days later the check engine light came back on. I took it back to advance auto and the computer gave the same fault....help, Rickey
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If you have a simple scanner, you can diagnose this right away. If not, your 'nice guy' auto parts store can diagnose for you for free, just buy the part from him. You most likely have a sensor problem.
you may have a bad idle control sensor. is your check engine light on? if so,then you can have it coderead at autozone or advance auto for free. but the check engine light has to be on in order to diagnose it,for free.thank you for choosing fixya.com.
Could be one of many...mechanic would be better at diagnosing. Things to try...coolant temp sensor, distributor cap, spark plugs and wires. Coolant temp sensor would be my first guess. Would recommend taking it to a mechanic or Advanced Auto Parts (they check codes for free) while the light is on. They can hook up their computer and find out what codes are being thrown up and better give you an idea on what to fix.
The sensor is located on the drivers side engine block...although you can see if from looking from the top of the engine, you would have to get under the vehicle and look up to replace it. Be aware that it takes a special tool to unscrew the old one and screw in the replacement.