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Q: What causes check engine light to illuminate?
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Symptoms of a bad o2 sensor?

The "check engine" light would illuminate.


Where can I test the check engine light?

Simply turn on the ignition but do not attempt to start the engine. If the light bulb is good you will see the Check Engine light illuminate and stay on. If you do not see the Check Engine light, the bulb is defective or has been removed.


Is it possible that the gas cap is the first thing to check on 2003 Mitsubishi galant when the service engine soon light is on?

If not installed properly check engine light will illuminate


Where is the check engine sensor on a 85 chevy S10 blazer?

The check engine light is triggered by the Engine Control Module (ECM). The ECM receives information from many sensors and determines when to illuminate the check engine light.


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The "Check engine" light will illuminate and a code will set.


How would you no if your tps going out on a 2000 Cadillac deville?

The check engine light would illuminate.


What happend when oxygen sensor go bad on 1996 impala?

The check engine light will illuminate.


How do you check 95 civic check engine light?

Connect an OBD2 scan tool which will retrieve the codes set by the ECU. If you mean how to check to see if the light is working just turn the key on without starting the engine. The check engine light will illuminate.


Can Pvc valve cause service engine light to illuminate?

It is possible, anything that could affect the emissions of the vehicle can turn the check engine light on.


How do you know if your catalytic converter is bad?

Depending on the year of the vehicle, the check engine light would illuminate.


Can a malfunctioning computer cause a car to idle rough?

Yes, and the check engine light should illuminate.


How do you know if a egr valve is bad?

Depending on the vehicle the check engine light would illuminate.