Why is my check engine light on after getting gas?

Typically if a check engine light comes on after filling the fuel tank, it’s due to a vapor pressure problem. This often is triggered by one of the EVAP system components. This system is designed to filter harmful vapors from the fuel tank. An older or incorrect fuel cap can cause this issue.

Why would my check engine light come on after getting gas?

There are many reasons your car’s check-engine light turns on after you fuel up. It could be a loose gas cap, a gasket gone bad on said gas cap, or a damaged vacuum hose, among others. … If it detects a loss of pressure, the check-engine light will come on, indicating that there’s a problem.

Can gas Make your check engine light come on?

Sometimes a tank of bad gas can cause a “check engine” light to come on. If your indicator light is caused by bad gas, it will shut itself back off after you run a tank or two of good gas through the car. … Many automotive parts stores and some repair places will hook your car up to a diagnostic reader free of charge.

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How long before check engine light goes off after gas cap?

As soon as it’s safe, pull over and make sure your gas cap is tight. Once you’re back on the road, your check engine light should go off within 10 or 20 miles.

How do you reset the check engine light on gas?

How to Reset the Warning Light Gas Cap That Is Loose or Missing

  1. Turn off your vehicle’s engine. …
  2. Step to the gas cap door. …
  3. Replace the gas cap. …
  4. Close the gas cap door. …
  5. Use an OBD-II code scanner if the warning light does not disappear. …
  6. Continue driving the vehicle.

What is the most common reason for a check engine light?

Replacing a faulty oxygen sensor — a sensor used to optimize a vehicle’s fuel-to-air mixture to increase gas mileage and reduce emissions — is the most common cause for a check engine light. With over 400,000 repairs nationwide, oxygen sensor replacements account for 8% of all check engine light repairs.

Can low oil cause the check engine light to come on?

Low oil pressure



Low oil pressure is a common cause of a check engine light turning on, and it can seriously interfere with your car’s performance. Usually, if this is the case, your oil light will also appear. … In any case, low enough oil pressure will disable your vehicle, so get this repaired immediately.

Can bad gas cause blinking engine light?

Modern cars have on-board diagnostic (OBD) tools that monitor car’s functioning. If your car’s computer detects a malfunction in the engine, fuel, or pollution system, it may trigger the check engine light (CEL) to blink on your dashboard.

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Will check engine light go off after replacing gas cap?

The check engine light should go off after you drive for several minutes if the light was caused by a loose gas cap. … If you find that the light keeps coming on, and goes off again once you tighten the gas cap, then your gas cap is too loose.

Does AutoZone check gas caps?

Safeguard your emissions system and give a clean, finished look to the exterior of your vehicle with replacement fuel caps and doors from AutoZone. … When you take your vehicle to pass the emissions test, the last of your worries should be a faulty fuel cap or door.

Can AutoZone reset check engine light?

Does AutoZone Scan Check Engine Lights? AutoZone does. If your light is on, and you are wondering why, head down to your local AutoZone where one of our store associates can help diagnose the issue through our free Fix Finder service.

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