What happens when you turn off the Check Engine light?

What happens when you turn off the Check Engine light?

Some computers are programmed to see a problem, store a code, and light the check engine light. Then later, if the problem does not reoccur, the computer will turn off the check engine light and store the code as a HISTORY CODE.

Is there check engine light but no code?

There are other cases where there’s no check engine light but codes. For example, any problem that affects the emissions system will automatically light the check engine light. But if the problem is not emissions related, and also not critical, it may be stored in the computer but not light the check engine light.

What happens when no codes are set for OBD2?

This means that if no codes are set (translates to no trouble found) after all the monitors have been run, then your vehicle is running clean and will pass an OBDII plug-in emissions test or a tailpipe smog check.

What does it mean when a car has an OBD2 scanner?

When that light is on it means there is a certain sensor in the car that has sent an error message to the powertrain control module (PCM) which it can’t decode.

What does it mean if your check engine light is on but no code?

If the check engine light is on, you’ve got a trouble code stored. The same is true if you have ABS light on, TCS light on, VSC light on, etc. etc. If your check engine light is on but no code, it’s your scan tool, not the vehicle.

This means that if no codes are set (translates to no trouble found) after all the monitors have been run, then your vehicle is running clean and will pass an OBDII plug-in emissions test or a tailpipe smog check.

When does the Check Engine light reset itself?

Reset onboard diagnostic computer. If you are sure that you have fixed the problem that the Check Engine light was showing up for, the engine light will reset itself after 10-20 successful cycles. A cycle is when the car is cold and started until it’s at operating temperature.

What should I do if I Can’t Read my OBD code?

If you’re scanning your car’s computer for OBD (on-board diagnostic) codes and getting nothing in return, there are some things you should check before you give up and take your car to the shop.