Volkswagen sagitar bank 1 sensor 1 signal is too low.

Sagitar bank 1 The sensor is on the exhaust pipe. Once the air-fuel ratio of the mixture deviates from the theoretical air-fuel ratio, the purification ability of the three-way catalyst for CO, HC and NOx will drop sharply. Therefore, an oxygen sensor is installed in the exhaust pipe to detect the oxygen concentration in the exhaust gas and send a feedback signal to the ECU, and then the ECU controls the increase or decrease of the fuel injection quantity of the injector, so as to control the air-fuel ratio of the mixed gas near the theoretical value. Common faults of oxygen sensor are as follows:

1, oxygen sensor poisoning: due to the high exhaust temperature, lead intruded into it, which hindered the diffusion of oxygen ions and made the oxygen sensor invalid and had to be replaced;

2. Carbon deposition: Due to poor engine combustion, carbon deposition is formed on the surface of the oxygen sensor, or deposits such as oil or dust enter the oxygen sensor, which will hinder or prevent the outside air from entering the oxygen sensor, making the output signal of the oxygen sensor inaccurate and the ECU unable to correct the air-fuel ratio in time;

3. Ceramic fragmentation of oxygen sensor: the ceramic of oxygen sensor is hard and fragile, and it may be broken and invalid if it is hit by hard objects or washed by strong airflow;

4. The heater resistance wire is burnt out: for the heated oxygen sensor, if the heater resistance wire is ablated, it is difficult to make the sensor reach the normal working temperature and lose its function.