2010 Mazda B Series OBD2 Code P2BAB nox Exceedence - Incorrect EGR Flow

OBD II Fault Code

• OBD II P2BAB

OBD-II Code Blockage in the EGR system is defined as a nox Exceedence - Incorrect EGR Flow

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 P2BAB will be set.Additional codes will be stored. Those codes will need to be diagnosed and repaired.

Common Problems That Trigger the P2BAB Code

• Blockage in the EGR system
• EGR valve failure

Common Repairs Needed for the P2BAB Code

• Mass Airflow Sensor Replacement
• EGR Valve Replacement