why is my check engine light on but car drives fine

Auto Repair the Way It Should Be. This is another common reason for a check engine light to come on.

Reset A Check Engine Light At Your Own Risk

The most common cause of a check engine light is an issue with the emission control system like a bad oxygen sensor or MAF sensor.

. Gas Cap Is Loose. Different Types of Engine Light Illuminations. ESC light came on when driving - then check engine light Likley there is a misfire in one of the cylinders.

This condition is typically caused by a bad spark plug ignition coil clogged catalytic converter or blown head gasket. ISO9141 is not a Diagnostic Troubleshoot Code it is a protocol language used by car manufacturers. Usually due to worn out sparkplugs or wires.

It can also be due to issues with the ignition like bad spark plugs or ignition coils. Ad Certified Mechanics Will Come to Your Office or Home. The check engine light turns on and then off because the main computer might not be correctly registering the problems at all times.

If your check engine light comes on dont. 7 Days a Week. Untightened gas cap is the most common reason the check engine light is triggered.

It most likely has a loose gas cap a faulty oxygen sensor bad spark plugs or a faulty mass airflow sensor among others. Though there are plenty of feasible and specific reasons for a check engine light to come on some issues are of course more common than others. There are three common things for how the check engine flash illuminates.

The oxygen sensor or O2 sensor is a device that measures the oxygen levels in your cars exhaust system. There are several reasons why a cars check engine light turns on and off intermittently. The check engine light will definitely come on if your car has spark plugs spark plug wires a distributor caprotor or ignition coils and the parts are failing and causing the engine to misfire.

Causes of a Flashing or Blinking Check Engine Light. If your check engine light is flashing on and off it means that the engine is missfiring. Ad Used Cars for Sale Ranked by Best Deals Price.

Faulty engine sensors coolant air temperature exhaust temperature sensor etc Faulty EGR valve. Misfires on one or several cylinders most common Faulty spark plugsCoils. Perhaps you forgot to tighten the gas cap.

Common Check Engine Light Explanations. First is the continuous illumination it is not flashing when the engine light is simply on it means there. Replacing these worn out parts will not only improve your gas mileage right away but they can also make the car run substantially better assuming theres nothing else wrong.

Basically the check engine light can be caused by any issue with your engine. Read the codes with an OBD-II scanner to find out why your check engine light is flashing. Any electronic sensor or component on your vehicle that detects engine performance anomalies can cause the Check Engine Light to activate and a lack of communication with the sensor may also result in a trouble code.

1 J1850VPM Variable Pulse Width Modulation at 416 Kbps 2 J1850PWM Pulse Width Modulation at 104 416 Kbps 3 ISO 9141-2 Asynchronous serial communication at 104 Kbaud 4. There could be many things that can cause the check engine light to come on while driving. Yes something as simple as a loose gas cap or broken or missing gas cap can be the cause of.

Any Vehicle Any Place Any Time. This information is relayed to your cars computer which can then make adjustments to ensure the correct mixture of air and fuel in your engine is maintained. Why is my car running fine but the check engine.

Find 4 million cars for sale all in one place. The check engine light is a signal of a problem lying in your engine. A check engine light that turns when your car is running fine means there are problems in its electrical system or issues in its emission system.

Plus it can also be the frozen electronic stability control sensor a loosened gas cap or the clogged air filter. You can base the level of severeness on how the light is illuminating. It can be a pending code stored in the computer.

Below are some of the more common explanations for a CEL.

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