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 - Correction value exceeded or cycle duration too long.
Duration Of Test - Up to 190 seconds.
Test Conditions - Engine speed approximately 1000-2000 RPM, engine load 15-50 percent, TWC temperature more than 716°F (380°C), Lambda control enabled, no fault with TWC effect, and no fault with oxygen sensor heating.

NOTE: The period of the O2 sensor before TWC is too long; O2 sensor after TWC does not continue to be monitored. Correction value of O2 sensor before TWC exceeded; O2 sensor after TWC continues to be monitored. If faults for the O2 sensor before and after TWC are recognized at the same time; usually only the O2 sensor after the TWC is defective.