1. Fix the underlying problem. The most permanent way to turn off your check engine light is to fix the underlying problem that is causing it. This may involve anything from replacing a faulty sensor to overhauling your engine.
2. Disconnect the battery. Disconnecting the battery will clear the codes from your vehicle's computer, which may turn off the check engine light. However, this is only a temporary solution, as the light will come back on if the underlying problem is not fixed.
3. Use an OBD-II scanner. An OBD-II scanner can be used to read the codes from your vehicle's computer and clear them. This is a more advanced solution than disconnecting the battery, but it can be more effective in some cases.
4. Install a resistor. A resistor can be installed in the circuit between the oxygen sensor and the vehicle's computer. This can trick the computer into thinking that the oxygen sensor is working properly, which may turn off the check engine light. However, this is not a permanent solution, as it can cause other problems with your vehicle's emissions system.
5. Use a fuel injector cleaner. A fuel injector cleaner can be added to your vehicle's fuel tank to clean the fuel injectors. This may improve your vehicle's performance and fuel economy, which may also turn off the check engine light.
6. Drive the car for a while. In some cases, the check engine light will turn off by itself after a while if the problem that caused it is intermittent or has resolved itself.
Note that, the check engine light is a warning that something is wrong with your vehicle. Ignoring the check engine light can lead to serious problems, such as engine damage or a failed emissions test. It is important to have your vehicle diagnosed and repaired as soon as possible if you see the check engine light.