DTC Description

WARNING: This page is about a different car, the 2002 Mercedes-Benz G500. However, it is still accessible from the selected car via links, so may be relevant.

Fault Memory & Actuation Of MIL - After 2 consecutive driving cycles with fault.
Frequency Of Testing - Continuous.
Checked Signal Or Status - Calculated resistance value of sensor heater.
Lower Limit Value - Less than 2 ohms. Corresponds to approximately 6 amps at 12 volts.
Upper Limit Value - More than 10 ohms. Corresponds to approximately 1.2 amps at 12 volts.
Test Conditions - Sensor heater on and heating-up time of approximately 220 seconds has elapsed.

NOTE: Fault in O2 sensor heating is also set if cycle duration of O2 sensor signals within a driving cycle suddenly increases to more than 25 seconds.