What is Cylinder Bank 1 Sensor 1?
1 Answers
Cylinder Bank 1 Sensor 1 refers to a pre-catalytic converter oxygen sensor malfunction. The diagnostic methods for a faulty pre-catalytic oxygen sensor are as follows: 1. Read the pre-catalytic oxygen sensor data stream: The voltage should fluctuate between 0.1~1V, with changes occurring more than 8 times per 10 seconds. If the voltage fluctuates between 0.1~0.5V, it indicates a lean air-fuel mixture; if between 0.5~1V, it indicates a rich mixture; if remains static at 0.4~0.5V, it indicates sensor damage. 2. Check the oxygen sensor resistance: After the engine reaches normal operating temperature, disconnect the sensor wiring harness and measure resistance with an ohmmeter. The value should match the vehicle manufacturer's specifications. 3. Test the sensor's voltage output signal: With the sensor reconnected, extend a test lead. Start the engine, warm it to normal temperature, and maintain idle. Monitor the sensor's output voltage. When disconnecting a spark plug wire, exhaust oxygen content decreases - if the voltmeter shows increased voltage, the sensor functions properly. 4. Observe the sensor tip color for fault identification: (1) Black tip indicates carbon contamination - remove and clean carbon deposits; (2) White tip indicates silicon contamination from using non-compliant sealants during repairs - requires sensor replacement; (3) Reddish-brown tip indicates lead contamination from using leaded gasoline.