2003 Mercury Grand Marquis OBD2 Code P2BA9 nox Exceedence - Insufficient Reagent Quality

OBD II Fault Code

• OBD II P2BA9

OBD-II Code Diagonostic Trouble Code is defined as a nox Exceedence - Insufficient Reagent Quality

The purpose of the reductant system (DEF) is to reduce the amount of NOx released by the diesel engine. The engine computer (PCM) uses multiple NOx sensors to confirm the performance of the reductant system. If excessive emissions are detected, the PCM will deactive other systems to prevent additional component damage. Code P2BA9 will be set.Additional codes will be stored. Those codes will need to be diagnosed and repaired.

Common Problems That Trigger the P2BA9 Code

• DEF contamination

Common Repairs Needed for the P2BA9 Code

• Mass Airflow Sensor Replacement