Can spark plugs make my check engine light come on?

One common cause of a check engine marker light-up is spark plug wires gone bad. This can cause your engine to misfire and trip your check engine light. With your engine off, remove your spark plugs and check the wires for tiny cracks or holes, particularly near the ends of the wires.
A.

Is it safe to drive your car with the check engine light on?

Regardless, you're safe to drive for now as long as the car isn't performing strangely. Just have the Check Engine Light checked and the problem repaired. If you left the gas cap loose or off, the computer would detect a leak in the evaporative emissions system and turn on the Check Engine Light.
  • How many miles does it take to clear a check engine light?

    After you clear the computer you need to drive up to 100 miles to give it a chance to monitor all the sensors and register the results. Sometimes it may be complete in about 50 miles.
  • What are the symptoms of a bad gas cap?

    Symptoms of a Bad or Failing Gas Cap
    • Cap does not tighten properly. One of the most common symptoms of an issue with the gas cap is a cap that does not tighten properly.
    • Fuel smell from the vehicle. Another symptom of a possible issue with the fuel cap is a fuel smell from the vehicle.
    • Check Engine Light comes on.
  • What does it mean when the check engine light flashes on and off?

    A flashing CEL (Check Engine Light) is something serious to be concerned about. A blinking CEL indicates that your vehicle's engine is misfiring, which could severely damage your catalytic converters. Engine misfire is a severe condition that requires immediate attention to avoid expensive repairs or even a car fire!
B.

What can cause the check engine light to come on?

It might just be your gas cap. Many people don't know this, but a loose, cracked, or faulty gas cap can cause fuel to evaporate, thus cuing your check engine light. So first things first, pull over (as soon as it's safe) and make sure your gas cap is on tight.
  • How many miles does it take to clear a check engine light?

    After you clear the computer you need to drive up to 100 miles to give it a chance to monitor all the sensors and register the results. Sometimes it may be complete in about 50 miles.
  • Can Autozone diagnose check engine light?

    All Autozone locations should offer the service. Please note that while Autozone says they offer check engine light diagnostics, it typically is not as thorough as people expect. The "diagnostic" consists of having error codes scanned and then possible causes and solutions being printed out.
  • Why is my service engine soon light on?

    Meaning of the Service Engine Soon Light. The check engine light is a light to warn you to a possible issue with your exhaust system or emissions system. The service engine soon light can come on for minor issues like a loose gas cap, or for more major problems such as possible engine failure.
C.

What does it mean when the check engine light comes on?

If the check engine light comes on: Look for a serious problem that requires immediate attention. Check your dashboard gauges and lights for indications of low oil pressure or overheating. These conditions mean you should pull over and shut off the engine as soon as you can find a safe place to do so.
  • How much is a catalytic converter cost?

    Installation takes about an hour on average, depending on the vehicle; total costs for parts and labor can be $300-$3,000 or more. CarMD.com names replacing a catalytic converter as the third most common car repair related to a "check engine" warning light, and estimates the average cost for parts and labor at $1,029.
  • What can cause the check engine light to come on?

    It might just be your gas cap. Many people don't know this, but a loose, cracked, or faulty gas cap can cause fuel to evaporate, thus cuing your check engine light. So first things first, pull over (as soon as it's safe) and make sure your gas cap is on tight.
  • Can Autozone diagnose check engine light?

    All Autozone locations should offer the service. Please note that while Autozone says they offer check engine light diagnostics, it typically is not as thorough as people expect. The "diagnostic" consists of having error codes scanned and then possible causes and solutions being printed out.

Updated: 5th October 2018

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