After replacing a camshaft sensor, the most important next steps are to clear the error codes with an OBD-II scanner and perform a sensor relearn procedure if your vehicle requires it, which can sometimes be done by a specific driving pattern or with an advanced scanner, ensuring the new sensor functions correctly and the Check Engine Light stays off for optimal engine performance. Always test drive the car to confirm smooth operation and check for any lingering issues.
It's only necessary when installing an all-new camshaft position sensor, not when you do a simple code-reader reset. Without correct calibration, the camshaft sensor may produce false data, resulting in poor performance, lower efficiency, and higher emissions, potentially causing engine damage.
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.
The cam sensor does not require any relearn after it has been replaced. However, if the crankshaft sensor is replaced, the CKP relearn procedure must be performed.
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.
After replacing a crankshaft sensor, confirm proper installation, reset the ECU, run idle and road tests, and scan for codes. Watch fuel economy, wiring, and related sensors to ensure long-term reliability.
Unplugging the camshaft position sensor may lead to less precise performance, resulting in issues such as rough idling, engine misfires, and other irregularities.
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.
The crankshaft position sensor allows your car engine to adjust timing and other performance metrics, which can become imbalanced or maladjusted when there is a computer malfunction. Simply restarting the engine, even for just a few moments can provide an effective reset that can bring these metrics back into balance.
Turn the ignition on but keep the engine off.
Insert the key and turn it to the “On” position without starting the engine. This powers the ECU and allows it to reset.
Steps to change a camshaft position sensor
What Causes a Camshaft Sensor to Go Bad? CMP sensors are subject to the harsh operating conditions found in the engine compartment. In most cases, the sensors simply wear out over time. The sensors can also be affected by metal debris (an indicator of bigger problems) circulating through the engine.
MAF cleaners usually dry pretty quickly, so you don't have to wait too long for the sensor to dry. Follow the wait time indicated in the cleaner's instructions. Don't try to wipe it with a dry cloth, or you might end up damaging its parts. Just let it air-dry for a few minutes.
To remove light rust, leave parts in the solution for 1-3 hours. To remove heavy rust, leave parts in the rust removal solution overnight. Do not use on parts that have bluing, browning, or protective oxide paints, as those protective coatings would be removed.
Answer: No. Mass Air Flow (MAF) sensors are extremely sensitive. Brake cleaner can: Damage the delicate sensing wires.
4. Relearn the New Cam Sensor
Replacing a camshaft position sensor typically involves a plug-and-play process, with no direct need for reprogramming.
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.
Most cars adjust within a few drives, but full reset may take 50–100 miles depending on ECU and driving style.
Locate the TPMS reset button (often found beneath the steering wheel or in the glove box). Press and hold the reset button until the TPMS light blinks three times, then release. Start your vehicle and drive at least 5–10 minutes at 50 mph to allow the system to recalibrate.