P2099 Code Mercedes Benz: Diagnosis, Causes, and Solutions

The P2099 Code Mercedes indicates a “Post Catalyst Fuel Trim System Too Rich (Bank 2)”. AutoExplain.com understands the complexities of modern automotive diagnostics, and this guide provides comprehensive information to help technicians and owners understand and resolve this issue. We offer remote support for those challenging diagnostic situations to ensure your Mercedes-Benz is running optimally, so you can rely on our team for expert technical assistance, comprehensive diagnostic strategies, and effective repair solutions to address the P2099 trouble code and similar engine performance issues.

1. Understanding the P2099 Code on a Mercedes-Benz

The P2099 diagnostic trouble code (DTC) signifies that your Mercedes-Benz’s powertrain control module (PCM) has detected an excessively rich fuel condition downstream of the catalytic converter on bank 2. This means the oxygen sensor located after the catalytic converter on the side of the engine opposite cylinder #1 is reporting higher than normal levels of unburnt fuel. This condition triggers the PCM to store the P2099 code and illuminate the check engine light.
![Mercedes-Benz Engine](https://blogger.googleusercontent.com/img/a/AVvXsEi0hFgl2I9C9Uu6iC1WkE8G7_H9Qn5e8nBvL6g-s29s5b2Nq50H0wO_R9a9Z8tX_k6pYhG6_8J6R6_q2fW9v3uSjH9_h0T0q4a6_yW3xH6v3iN0iB3c2I7_n3yA9X5v3V2f_l6O0i7_c5X9z9N0i4L5v3d_m6N8u2R7_l6J4h9_s9A7j2J5n9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8M6j2K7_s2F5n9H0i3Z9a9H0i6Z9i8