P00BD - MASS OR VOLUME AIR FLOW "A" CIRCUIT RANGE / PERFORMANCE - AIR FLOW TOO HIGH

The MAF sensor (Mass Air Flow Sensor) measures the volume and density of air entering the engine. This sensor is usually located in the intake near the air cleaner. Although this sensor only measures a portion of the air entering the engine, this value is used to calculate the total volume and density of the air.

The Powertrain Control Module (PCM) ensures that the fuel delivery at different driving points is right by reading the MAF Sensor and other data from it. The PCM makes this process in order to achieve higher engine power and fuel efficiency.

The P00BD OBDII fault code setting occurs when the PCM detects the Mass Air Flow Sensor A circuit has a condition in which the air flow is excessively high.

• The Check Engine light turns on.
• High levels of black smoke are expelled from the exhaust.
• Engine stalling.
• Difficult start of the engine.

The setting of the P00BD OBD2 diagnostic code occurs due to the following reasons:

• The Air Mass Flow Sensor may have contamination.
• The MAF Sensor is possibly in bad condition.
• There could be intake exhaust leaks.
• The MAF Sensor electrical circuit may be damaged, resulting in a short circuit.

Steps for troubleshooting the P00BD OBDII DTC:

• See Technical Service Bulletins (TSB).
• Check wires and connectors related to the Mass Air Flow Sensor for defects that would cause a short. Repair or replace as necessary.
• Check the system for air leaks at the intake. If such leaks are found, repair them.
• Check the MAF Sensor for signs of contamination by oil or other components. Note that if the filter is dirty, it should be replaced.
• Use a multimeter to verify that the resistance of the Mass Air Flow Sensor is as indicated in the service manual. If you detect a value out of range, you should check the condition of the sensor. Replace it if required.