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The light comes on to tell you of a problem. It's the way the computer tells you that you need to find out what's wrong with the system.
If you clear a code and it comes back, that means that the computer has detected the problem again and that it's a real problem. Fix it, replace whatever has gone bad or have someone do it for you. Then the problem should go away permanently.
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∙ 15y ago
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What causes engine light to come on and stay on after clearing?
It usually means that the fault has not been cleard. Use a code scanner, read the code and repair the problem then you should be able to successfully clear the check engine light.
Why would the check engine light be on in a Nissan Altima?
Use an automotive computer code-scanner to read the stored code. Then you'll know why the "check engine" light is on.
For a dodge grand caravan Should a engine code of P1684 cause the check engine light to come on?
It would be very rare for a P1684 code to turn the light on.
What would cause check engine light and code p0304?
Engine missfire. Cylinder #4
Why would the check engine light come on in a 2002 Chevy Malibu?
The light could come on for a number of reasons. The vehivle would have to be hooked up to a scanner to determine the engine code or codes. After you determine the codes you can isolate and fix the probelem. If the check engine light is on there will be a computer code that will appear on the scanner.
How do you reset airbag light on 2000 dodge neon?
The airbag light stays on when the computer has detected a malfunction and set a code. Clearing the code with out repairing the failure will not shut the light off.
If your check engine light came on and the car started ru nning rough and then the check engine light went out would the code still be stored the cars ecm?
Yes. The code should still be there.
Would replacing an exhaust cause the check engine light to come on?
Maybe, the check engine light comes on when the computer detects a malfunction and sets a code.Maybe, the check engine light comes on when the computer detects a malfunction and sets a code.
How do you reset the codes on a Volvo 850?
You will need an OBDII code reader these can be purchased from Walmart or Harbour Freight from $ 49 and up. This device plugs up to the Volvo's computer via the OBD port found under the change holder on the center console just in front of the gear shift. Once plugged up follow the instructions that comes with the reader on how to clear codes. Before clearing the code, write it down. If after clearing the codes it returns then the problem s a Hard code and must be repaired or it will continue to light the check engine light on the dash. Again if the code returns you must repair the problem that is setting of the check engine light. If the Light is ABS or SRS This will not reset the light.
Why would the check engine light come on when you changed your tail light?
There are pages and pages of things that can cause a check engine light. You need to have it checked with a scantool. Then the code can be diagnosed and repaired.
Where would you fine check engine light codes for a Chevy silverado truck?
You can buy the check engine computer and the book comes with it. I know, I bought one. When your check engine light comes on, you plug it in and check the engine and it will give you the code and you look in the book for that code and it gives you the answer.
What would make check engine light come on in 2004 jeep Cherokee?
There are pages and pages of things that can cause a check engine light. Have the code checked with a scanner.
