OBD-II DTC · SAE J2012
P2099
Post Catalyst Fuel Trim Sys Too Rich Bank2
What P2099 means
P2099 is a standard SAE J2012 powertrain diagnostic trouble code with the defined meaning: Post Catalyst Fuel Trim Sys Too Rich Bank2. This is the OEM-agnostic definition; specific manufacturer interpretation may add detail (subsystem, bank, sensor location) but the core meaning is consistent across all OBD-II compliant vehicles since 1996.
Can this code be suppressed via ECU tuning?
Suppressible at the calibration level. Required when fitting a de-cat downpipe or running a leaner catalyst. Off-road only.