Check Engine Light Conundrum Car Functions Perfectly, Warning Confuses

If they are good, it is probably your harness. Buy some contact cleaner & a tube of Ox-gard from any home improvement store. They can be found in the electrical ... The check engine light is constantly on: Your vehicle's onboard diagnostic system has determined something is wrong and needs to be fixed. Although your vehicle ... My car runs fine and seems to shift fine in automatic mode. For some ... but not much but the shifting seems rather delayed probably bc ... If the Check Engine light doesn't come on in the run position it means the computer failed the self-test mode and there's a problem with the computer. It could pop on because of something minor like a loose or faulty gas cap. It could also mean a major engine failure. Low oil pressure is a common cause of a check engine light turning on, and it can seriously interfere with your car's performance. pull the negative terminal out of the battery and open the driver side door for 10min so it releases any charge left in the system. Then put the ... If there are no other symptoms, your check engine light may indicate a problem with your computer, a loose gas cap, transmission errors, or ... No. My rule of thumb is to run a tank or two of gas through the car once the light comes on. If the light doesn't go off then I take it in. Spark plug/ignition coil issues: Faulty spark plugs or coils can cause engine misfires, rough idling, and trigger the "check engine" dashboard light. The ...