Diagnostic Trouble Code
P00BD
MAF "A" Circuit Range/Performance Flow Too High
Technical Description P00BD
P00BD Mass or Volume Air Flow "A" Circuit Range/Performance - Air Flow Too High
What Does This Mean P00BD?
This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles with a Mass or Volume Air Flow sensor (BMW, Ford, Mazda, Jaguar, Mini, Land Rover, etc.). Although generic, the specific repair steps may vary depending on year, make, model, and/or powertrain.
The mass air flow (MAF) sensor is a sensor mounted in a vehicle's engine air intake tract downstream from the air filter, and is used to measure the volume and density of air being drawn into the engine. The MAF sensor itself only measures a portion of the air entering and that value is used to calculate the total volume and density of air being ingested. The MAF may also be called a Volume Air Flow sensor.
The powertrain control module (PCM) uses that reading along with other sensor parameters to ensure proper fuel delivery at any given time for optimum power and fuel efficiency.
Basically this P00BD diagnostic trouble code (DTC) means that there is a problem with the Mass or Volume Air Flow (MAF) "A" sensor circuit. The PCM detects that the actual MAF sensor frequency signal is not within a predetermined expected range of the calculated MAF value, and in this case it's determined that the air flow is too high.
Note the "A" part of this code description. That letter denotes either part of the sensor or circuit, or even a single MAF sensor if the vehicle has more than one.
Note: Some MAF sensors also incorporate an air temperature sensor, which is another value used by the PCM for optimal engine operation.
The mass air flow (MAF) sensor is a sensor mounted in a vehicle's engine air intake tract downstream from the air filter, and is used to measure the volume and density of air being drawn into the engine. The MAF sensor itself only measures a portion of the air entering and that value is used to calculate the total volume and density of air being ingested. The MAF may also be called a Volume Air Flow sensor.
The powertrain control module (PCM) uses that reading along with other sensor parameters to ensure proper fuel delivery at any given time for optimum power and fuel efficiency.
Basically this P00BD diagnostic trouble code (DTC) means that there is a problem with the Mass or Volume Air Flow (MAF) "A" sensor circuit. The PCM detects that the actual MAF sensor frequency signal is not within a predetermined expected range of the calculated MAF value, and in this case it's determined that the air flow is too high.
Note the "A" part of this code description. That letter denotes either part of the sensor or circuit, or even a single MAF sensor if the vehicle has more than one.
Note: Some MAF sensors also incorporate an air temperature sensor, which is another value used by the PCM for optimal engine operation.
Symptoms P00BD
1
Malfunction indicator lamp (MIL) illumination (a.k.a. check engine light)
2
Engine running rough
3
Black smoke from tail pipe
4
Stalling
5
Engine hard start or stalling after it starts
6
Possible other driveability symptoms
Possible Causes P00BD
1
Dirty or contaminated mass air flow sensor
2
Failed MAF sensor
3
Intake air leaks
4
MAF sensor electrical harness or wiring problem (open, shorted, frayed, poor connection, etc.)
Solutions & Repair Steps P00BD
The best first steps for this P00BD diagnostic code are to check for Technical Service Bulletins (TSBs) that apply to your year/make/model/engine, and then do a visual inspection of the wiring and system components.
Possible diagnostic and repair steps include:
If you do need to replace the MAF sensor, we recommend using an original equipment OEM one from the manufacturer rather than buying an aftermarket part.
Possible diagnostic and repair steps include:
If you do need to replace the MAF sensor, we recommend using an original equipment OEM one from the manufacturer rather than buying an aftermarket part.