How to solve the P0321 trouble code?
2 Answers
P0321 trouble code solutions are as follows: 1. The causes of the P0321 trouble code include engine speed sensor failure, sensor wheel failure or mismatch, electronic control module (PCM or ECM) failure, etc. 2. If it is an engine speed sensor failure, you can measure the resistance between the two pins of the sensor (the normal value should generally be between 0.7-1.2). If it exceeds the specified resistance range, it indicates that the sensor is damaged, and the speed sensor should be replaced. 3. If the sensor is not damaged, you should check whether the electronic control module is faulty. If it is faulty, you should go to a 4S shop for repair.
A few days ago, my car suddenly had the check engine light on with a trouble code P0321, and it felt rough when driving, as if there was an issue with the ignition system. I looked it up online and found that P0321 is usually caused by a faulty crankshaft position sensor, which is responsible for the engine speed signal. I decided to fix it myself. First, I disconnected the negative battery terminal to prevent short circuits, then opened the hood to locate the sensor, which is typically mounted on the side or front of the engine. I cleaned the connector and interface with alcohol wipes because dust can cause poor contact. After reassembling it, I started the car, and the light went off—problem solved. If cleaning doesn’t work, you’ll need to replace the sensor, which costs anywhere from tens to a hundred yuan on the market. Before starting, it’s best to use an OBD scanner to check the data stream, which can save a lot of time. Regularly keeping the engine clean and preventing oil buildup can help reduce such issues.
