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Q: Check Engine Light is on

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The Check Engine Light is on in my car.

A: Since 1996, OBD-II (onboard diagnostics) ha...

Since 1996, OBD-II (onboard diagnostics) has been used to identify emissions related failures in vehicles. The Check Engine Light will illuminate when the powertrain control module (PCM) has detected a problem with the vehicle that may affect emissions. There are countless reasons the light may come on. The only way to know is to retrieve the diagnostic trouble codes the PCM has stored. I recommend you have a mechanic, like one from YourMechanic, inspect the Check Engine Light and repair any problem that is directly correlated with the light.

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