skipping steps or performing steps out of sequence could make the entire test worthless. Each step of each test must be performed in absolute sequence. Following that test will direct you to the problem. The only thing a code really indicates is which system or circuit to test in order to isolate the actual problem.Įach numerical code has a matching-numbered test procedure. This is where the real meaning of codes comes into play. However, unless there is an easy solution to the problem, you should have the vehicle diagnosed by a qualified service technician to properly find the root of the problem. Some automotive parts stores will read and interpret the code for you. Have the code read and the problem fixed. Have the car checked as soon as possible to prevent expensive damage. For example, it would be a good idea to stop towing a trailer. If the check engine light is blinking or you notice any serious performance problems, such as a loss of power, reduce your speed and try to reduce the load on the engine. Some vehicles have a separate indicator that warns of a loose gas cap before the condition sets off the check engine light.

Keep in mind that it may take several trips before the light resets. These conditions mean you should pull over and shut off the engine as soon as you can find a safe place to do so. Look for a serious problem that requires immediate attention.Ĭheck your dashboard gauges and lights for indications of low oil pressure or overheating. Today’s automotive computers often try to compensate when there’s a problem: so you may not notice deterioration in performance, even though your fuel mileage is suffering and your vehicle may be emitting unacceptable levels of hydrocarbons and/or other pollutants. If this occurs, you should reduce power and have the vehicle checked as soon as possible. There it can quickly raise the temperature of the catalytic converter to a point where damage is likely, requiring an expensive repair. The problem is not an emergency, but you should schedule an appointment as soon as possible.Ī blinking light usually indicates a severe engine misfire allowing unburned fuel to be dumped into the exhaust system. Either way, you should have the vehicle checked by a Qualified Service Technician as soon as possible. If the check engine light illuminates, it will either blink or remain constant, depending on the problem. Computers have control and monitor vehicle performance, regulating such variables as engine speed (RPM), fuel mixture, and ignition timing, and may even tell the automatic transmission when to shift. If you Check Engine Light is a warning light that informs you there is an issue with your emission related components of the vehicle and is part of your vehicles’ onboard diagnostic (OBD) system.

What causes check engine light to flash