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Why does the service engine light not come on when the key is in the run position?
Wiki User
∙ 14y ago
Reasons the service engine light does not come on:
The bulb is burned out. I would suspect this first.
There is a wiring problem.
The engine control module is bad.
Wiki User
∙ 14y ago
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Why don't the service engine soon light come on when starting the vehicle?
The check engine/service engine light should come on as soon as the ignition is turned to the on position without starting the engine. If it does not, then the bulb is either blown or has been removed.
Check engine light won't come on?
If an check engine light does not come on it is a good thing. When your check engine light comes on, it means you need service done on your vehicle.
Would the service engine soon light come on if a brake light is bad?
No.
Will your service engine light come on if your crankshaft sensor is bad?
yes
How do you reset the service engine light on a 1995 Beretta?
The service engine light has to be reset with a scanner. Disconnecting the battery will not work. The light will come back on unless you make the necessary repairs.
Will 90 plus outdoor temps cause the service engine light to come on?
Ambient temperature Should have no effect on Service engine light Have vehicle scanned to determine the problem
Trouble code indicated a bad cam sensor. I changed the sensor and reset light but service engine light come back on in a days time. Why would my service engine light come back on?
Could be a wiring issue or a completely different problem.
Can the service engine light come on because of getting bad gas?
Yes, it may cause a miss that will trigger the check engine light.
Your check engine light on your 1997 ford explorer does not come on when the key is turned in the auxiliary position Mechanic says it will not pass inspection unless the light is on. How do you correc?
Your check engine light will not come on in the auxilary (accesory) position. It comes on when the key is in the on (run) position to check the warning lights just before you start the vehicle.
Would the service engine light come on if engine temperature sensor is bad?
That is one of many possible causes.
Will a bad catalytic converter cause service engine soon light to come on?
Yes it can.
Would the service engine soon light come on if you have a burned out headlight on a 2000 Firebird?
No it will not.
