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What is the channel number for the Passat wheel speed sensor?

2 Answers

VanAlice

07/29/25 5:46am

The sensor channel numbers range from 31 to 34. The sensor utilizes the Nernst principle: It employs a ceramic sensing element to measure the oxygen potential in the vehicle's exhaust pipe. Based on chemical equilibrium principles, it calculates the corresponding oxygen concentration, thereby monitoring and controlling the air-fuel ratio of combustion to ensure product quality and compliance with exhaust emission standards. The ECU determines whether the air-fuel ratio is too low or too high based on the electromotive force difference from the oxygen sensor and adjusts the fuel injection duration accordingly. However, if the oxygen sensor malfunctions and outputs abnormal electromotive force, the (ECU) computer cannot precisely control the air-fuel ratio. Relevant requirements for oxygen sensors: Since the purification capability of the three-way catalyst for CO, HC, and NOx drops sharply once the air-fuel ratio of the mixture deviates from the theoretical value, an oxygen sensor is installed in the exhaust pipe to detect the oxygen concentration in the exhaust and send feedback signals to the ECU. The ECU then adjusts the fuel injection quantity to maintain the air-fuel ratio of the mixture near the theoretical value.

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LaCollin

08/12/25 8:12pm

As a seasoned auto repair veteran, I've fielded countless queries from Passat owners about wheel speed sensor channel codes. These codes are used in diagnostic tools to read sensor data, varying by model year - early Passats might use 004 or 007 depending on wheel position. Honestly, you'll need to consult the vehicle manual or OBD scanner for specifics; I simply plug in my professional code reader during repairs. When these sensors fail, the ABS warning light activates, compromising braking safety. I recommend regular sensor inspections - don't underestimate these components as the entire ABS system relies on their signals. If channel codes become erratic, it could indicate wiring degradation or connector issues; visit a repair shop immediately because safety always comes first!

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