09 Volkswagen LaVida 1.6 can't be reached, and the sensor signal is not credible when the engine speed is bright. If it is replaced with a new one, it will still be as bright as the fault code. How to

09 Volkswagen LaVida 1.6 can't be reached, and the sensor signal is not credible when the engine speed is bright. If it is replaced with a new one, it will still be as bright as the fault code. How to reply? I can't hit the engine, the signal of the sensor is not credible, and a new fault code is still on. Generally, there are several conditions of engine jitter, such as starting jitter, cold start, insufficient three-way catalytic temperature, and serious engine carbon deposition. The most common reason for vehicle jitter is that the throttle valve is too dirty or the nozzle has too much carbon deposit, because the gasoline adsorbed on the carbon deposit after landing is sucked into the cylinder by the engine and burned, and the combustible mixture of the engine is thin and thick, which leads to idling jitter after cold start. Solution: The company cleans the oil circuit, and checks whether the idle motor has carbon deposit, so it should be cleaned.