What are the symptoms of a faulty Passat sensor?
1 Answers
If the oxygen sensor of a Volkswagen Passat fails, the computer of the electronic fuel injection system will not receive information about the oxygen concentration in the exhaust pipe, thus unable to perform feedback control on the air-fuel ratio. This will lead to increased engine fuel consumption and exhaust pollution, as well as engine issues such as unstable idling, misfiring, and surging. Therefore, it is essential to promptly address the fault or replace the sensor. Below are relevant details: 1. Oxygen sensor poisoning: Oxygen sensor poisoning is a common and difficult-to-prevent fault, especially for vehicles frequently using leaded gasoline. Even a new oxygen sensor may only function for a few thousand kilometers. If the lead poisoning is mild, using a tank of unleaded gasoline can remove the lead from the sensor's surface and restore normal operation. However, excessively high exhaust temperatures often cause lead to penetrate the sensor's interior, obstructing oxygen ion diffusion and rendering the sensor ineffective, necessitating replacement. 2. Silicon poisoning: Silicon poisoning of the oxygen sensor is also common. Generally, silicon dioxide generated from the combustion of silicon compounds in gasoline and lubricants, as well as organic silicon gases improperly emitted from silicone rubber gaskets, can cause the oxygen sensor to fail. Therefore, it is crucial to use high-quality fuel and lubricants.
