You can't truly "reset" a bad camshaft position sensor (CMP) without a scanner, as it usually needs replacement if faulty; however, you can clear the warning light temporarily by disconnecting the battery for a while (sometimes with the positive and negative cables touching) to reset the computer's codes, but the light will return if the underlying problem isn't fixed, and sometimes a special "relearn" procedure after installing a new sensor is needed, which often involves just driving the car through various conditions.
A bad camshaft position sensor cannot be reset, so you'll need to swap it out for a new one instead. Check your owner's manual to find the location of the camshaft position sensor. It is usually attached to the engine or the cylinder head, but it varies based on the make and model.
Possible to do a relearn of the camshaft position sensor without a higher end Obd reader
Camshaft and crankshaft position sensor replacement is often necessary on many cars due to the common results of heat and vibration. However, if the proper relearn process is not performed to account for mechanical wear and manufacturing tolerances when replaced, you may face unnecessary comebacks and complaints.
Disconnecting the car battery from your vehicle does not reset your crankshaft position sensor (although this can still depend on the vehicle). Your engine control module will reset all of its code, but this is not the same as resetting and relearning a crankshaft sensor.
Unplugging the camshaft position sensor may lead to less precise performance, resulting in issues such as rough idling, engine misfires, and other irregularities.
Cleaning and retesting the MAF sensor several times is time-consuming, and the more you do it, the higher the chances are that you will end up damaging it. For the best results, replace the sensor with an OEM unit that is guaranteed to fit and function perfectly.
The key symptoms of a bad camshaft include ticking or tapping noises, poor engine performance, engine misfiring, a check engine light, and visible wear or damage.
While the sensor itself can be damaged, a loose wire, missing connector, or broken wire casing can create a short and cause an error code P0340. Pushing together loose connectors can sometimes solve the issue. Another solution is to replace connectors or wiring.
1. Do I need to reset the ECU after replacement? Yes, clearing the ECU helps the system relearn the new sensor. You can do this with an OBD-II scanner or by disconnecting the battery briefly.
To reset the camshaft position without a scanner:
While the new sensor is now installed, and you may get lucky and have it function perfectly right from the start, it's highly recommended to “relearn” the sensor at this point in order to calibrate the entire system properly.
In general, a new crankshaft sensor does not need to be programmed or recalibrated. Crankshaft sensors are typically plug-and-play components, and once installed, they should function without the need for additional programming in most vehicles.
Sensor Connection Issues: Faulty wiring, loose connections, or improper installation can cause intermittent or complete loss of signal from a sensor, resulting in unreliable measurements or complete sensor failure.
Disconnect the negative battery terminal to prevent a short circuit. This crucial step should be taken anytime you work with sensors or electrical components. Some crank position sensors may require the removal of exhaust components or the starter.
The actual problem with your car could be something different entirely. This means that more than one problem could be causing your check engine light to illuminate. Perhaps the technician replaced your oxygen sensor, but your engine also needs some spark plugs to be replaced.
Using an OBD2 Scanner
Plug the OBD2 scanner into your car's diagnostic port, usually located under the dashboard. Then, turn the ignition to the “ON” position without starting the engine. Write down or record the codes in case the light comes back. Select the option to clear or erase the trouble codes.
Locate and Remove: Find the designated ECM fuse using the diagram in your manual and carefully remove it with fuse removal tool (often included in the car's fuse box compartment). Wait for Reset: Similar to the battery method, wait at least 15 minutes for the computer to reset.