The problem can be as simple as a loose fuel tank cap or a bad spark plug, but it can also indicate a severe engine problem. You will need to read the codes with an OBD2 scanner. If your Volkswagen check engine light is continuously ON, it can be due to many possible issues. Replacing the temperature sensor is a simple DIY fix many VW owners can perform at home. Volkswagen engine coolant temperature sensor can fail, triggering the check engine light to come on. When reading the codes with an OBD2 scanner, you will get P0300, P0301, and P0302. When VW ignition coils fail, the check engine light will flash on and off, the engine will shake, plus you will have a poor throttle response. Sometimes, a brand-new ignition coil can malfunction or last less than 10,000 miles. Volkswagens are famous for ignition coils frequently failing in their four-cylinder 1.8 and 2.0T engines. Audi, BMW, Mercedes-Benz, Porsche, Toyota, and Honda struggle to make oxygen sensors that last forever. Volkswagens aren’t the only cars suffering from oxygen sensor issues. The oxygen sensors on Volkswagen vehicles often fail in the 80,000 to 100,000-mile range. Oxygen Sensorīad O2 sensors are another common reason the VW check engine light comes on. Volkswagen owners often forget to perform this maintenance and end up with CEL coming around the 120,000-mile mark. Typically you should change your VW spark plugs at the 90,000-mile mark. Worn spark plugs are another common problem that triggers the VW check engine light. Or use a YOUCANIC Scanner to reset the codes yourself. You can drive the vehicle, and the light will reset after a few driving cycles. Sometimes the seal can crack and not seal the fuel tank properly. If you read the codes, still get a code for EVAP system leak, inspect or replace the gas cap. Make sure you tighten the gas cap until you hear it click. Gas CapĪ loose gas cap can trigger a Volkswagen engine light to turn on. The Check Engine Light (CEL) on your Volkswagen ( Jetta, Passat, Golf, Tiguan, etc.) can come on for many reasons, including defective mass airflow sensor, bad thermostat, engine temperature sensor, short in main wire harness, vacuum leak, worn spark plugs and failed ignition coils. Read the fault codes to determine why your check engine light is on. Hundreds of possible problems can trigger the check engine light on a Volkswagen. To narrow down the problem, use the YOUCANIC scanner to read the codes via the OBD-II port. If the vehicle runs and drives fine, but the check engine light stays on, the most likely issue is an EVAP leak. Driving while the check engine light is flashing can lead to serious engine damage and overheating. Engine RPMs are high or unstable at idleĭon’t ignore these symptoms, especially if the check engine is flashing.In addition to the check engine light, you may notice a few more symptoms, such as: Both these parts set engine misfire codes in the ECU, and if more than one coil or spark plug is faulty, it will trigger multiple cylinder misfires, and the check engine starts to flash on and off. The most common problem that triggers the check engine light on Volkswagen vehicles is bad ignition coils and, quite often, faulty spark plugs. It is important to diagnose and repair the issue as soon as possible, as the check engine light can lead to other problems if ignored. We also show you how to troubleshoot the VW check engine light yourself. This guide covers some of the most common problems that trigger the check engine light on a Volkswagen. There could be several reasons why a Volkswagen check engine light stays on, but the most common issue with VWs is failed ignition coils.
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