Service instruction
- The internal resistance of the oxygen sensor heating can be measured when disconnected/removed. A resistance greater than 100 ohms can be measured between Pin 4 (12 V) and Pin 3 (ground) in the event of a fault and when the sensor is cold (less than 50 °C).
- Do not allow plug connection to come into contact with cleaning agents or solvents, since the oxygen sensor can be destroyed as a result.