When you first notice the check engine light illuminate, pull over and check your gas cap is properly in place â this is especially likely to be the problem if the light comes on right after you fill up. But the real question is, why is my check engine light on? The catalytic converter helps to reduce the pollutants and toxic gases from the internal combustion engine by using redox reaction technology. The first thing you should do if the check engine light is flashing or is constant on your dashboard is to read the trouble code memory. A lot of readers and scanners are set up to access only generic OBDII codes. Another thing that gets the check engine light flashing away frantically is a gas cap that hasnât been shut tight. There may be a few different vehicle issues that may cause your new Mazda CX-5 warning light, Mazda3 engine light, or your Mazda6 check engine light to go on. Because along with your Jeep check engine light coming on, other signs of ignition coil failure include rough idle, engine misfiring, poor emissions, a reduction in power or the car simply not starting. Hereâs something you probably donât know: after clearing the carâs computer you will need to drive for about 50 to 100 miles. The ignition coil functions as an induction coil. Maybe it cost you a fortune. Denise S July 16, 2020 611 Views 1 Answer Misty C answered on July 16, 2020 Your check engine and awd lights may illuminate in your 2015 toyota rav4 if the alternator is weak or your vehicle is experiencing sensor failures. When the engine light is lit up, and the engine control unit recognizes a problem with the engine, the engine control unit will store a trouble code in the memory. Although obvious, when the check engine light is on, it means an engine sensor is sending abnormal data to the computer (ECM). Helpful 1 Leave your â¦ Without accurate data, the ECM cannot precisely control fuel delivery and spark timing (and automatic transmission shifting). Their scanner showed a faulty catalytic converter with an estimate of $1800 for replacement. If your check engine light flashes and then stabilizes when you start the engine, you need to turn off the engine immediately and check the spark plug wires, using the OBD code. Whatever the cause, failure to get your Chevy vehicle checked out when the check engine light goes on could lead to further damage meaning costlier and more invasive repairs. I have tried multiple times to repair it but the light keeps coming on. You should also make sure that the battery terminals are clean, though with the battery being new, this shouldnât be an issue. And itâs getting on your nerves. Youâre going to need some kind of diagnostic tool to access your engineâs computer. Virginia Gorg is a writer and self-published author. If your car isnât feeling jerky or strange when the check engine light comes on, the first thing you should check is the gas cap. If your car isnât feeling jerky or strange when the check engine light comes on the first thing you should check is the fuel cap. As was mentioned, anything that could lead to an increase in tailpipe emissions has the potential to turn on the light. A check-engine light comes on after a fill-up, then goes away a few days later depending how many times I drive. My Honda Civic's check engine light (MIL) keeps alerting me to P0300 Random Misfire codes. Chances are that youâve had your check engine light issue fixed BUT the light is still on! Check the make and model of your â¦ You should also know that a defective idle air control valve might make the engine â¦ This can be very dangerous and may even cause damage to the catalytic converter, which is very expensive to fix. First, make sure the replacement battery is the right type for your vehicle. Replacing the spark plugs and spark plug wires is all you need to fix this problem. Conclusion. Protect your automotive investment and combat this issue before it becomes more significant by understanding the top reasons why your Toyota check engine light is on. Below is a list of the top 10 reasons why your Chevy check engine light may come on. That check engine light lets you know that something isnât quite right with your carâs engine, but what is it thatâs wrong? Your check engine light typically comes on when there is a problem with your emission control system or another computer-controlled system in your vehicle. The vehicle is emitting emissions which are higher than the Environmental Protection Agency mandates, and that is why the check engine light is on. The list of things that can trigger the check engine light is pretty lengthy. The mechanic will read the codes using a scanner, interpret the codes, and provide a diagnosis. 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