The check engine light illuminates when the onboard computer detects one numerous issues, including problems with an oxygen sensor, mass airflow sensor, gas cap, spark plugs or catalytic converter. Making repairs quickly... More »

Two common causes for the check engine light coming on are that the ozone sensor needs replaced or the gas cap is damaged or missing. Other reasons why the check engine light may come on include a bad catalytic converter... More »

When the "check engine" light comes on, it is important for the on-board diagnostics system in the car to be checked out in a timely manner. This can be done with an OBD scanner by the car owner or a qualified mechanic. More »

Common fixes that solve on-board diagnostic fault codes in a vehicle include replacing the oxygen sensor, tightening or replacing the gas cap, replacing the catalytic converter, replacing the mass airflow sensor and repl... More »

The check engine light may come on for various reasons including if the gas cap is loose, oxygen sensor needs replacing, spark plugs need replacing and catalytic converter has a problem. It is a good idea to check the en... More »

A lit check engine light in a vehicle is indicative of one or more problems including faulty oxygen sensors, leaking hoses or manifolds, damaged fuel injector O-rings, a blown head gasket and a loose or damaged gas cap. ... More »

A car's Check Engine light may come on when the oxygen sensor malfunctions, the gas cap fails, the ignition coil fails, spark plugs misfire, or the catalytic converter fails. Auto parts stores, repair shops and dealershi... More »