P0102 - Mass or Volume Air Flow Sensor A Circuit Low
P0102 is a generic powertrain diagnostic trouble code indicating Mass or Volume Air Flow Sensor A Circuit Low. It relates to the Fuel & Air Metering system.
DTC Breakdown (SAE J2012)
| System | Powertrain (P) |
| Type | Generic |
| Subsystem | Fuel & Air Metering |
| Fault Index | 02 |
| Standard | SAE J2012 / ISO 15031-6 |
What does diagnostic code P0102 mean?
The powertrain control module logged P0102 due to a low input fault in the maf-sensor/">MAF sensor circuit.
Severity Level & Driveability Details
Severity: Moderate
The engine runs in a default backup mode, which can cause poor fuel control and potential engine stalling.
Common Symptoms of P0102
- Engine hesitation, stumbling, or stalling.
- Rough running at idle.
- Lack of power on acceleration.
- Check engine light illuminated.
Typical Causes for P0102
- Dirty or contaminated MAF sensor elements.
- Intake air leaks or cracked intake boot downstream of the sensor.
- Failed MAF sensor assembly.
- Damaged wiring harness or loose electrical plug for the sensor.
Diagnostic and Troubleshooting Steps
Inspect intake tubes for leaks. Clean the sensor elements using a specialized electronic cleaner spray. Monitor live sensor readings on a scan tool while revving the engine.
Typical Repairs and Fixes
- Cleaning the MAF sensor elements.
- Replacing the cracked intake air tube.
- Replacing the MAF sensor assembly.
- Repairing damaged sensor wiring.
Sensor Location & Parts Involved
The MAF sensor is located in the intake air ducting, between the air filter box and the throttle body.
Clearing Code & Recurrence
Clear the code with a scanner to verify that the sensor readings rise smoothly.
Emissions & Smog Inspection Impact
Causes incorrect fuel-air ratios, increasing unburned tailpipe emissions.
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Related Diagnostic Codes
Sources & References
This diagnostic guide is compiled and verified against the following authority sources:
- EPA Technical Standards
- SAE J2012 reference guide
Frequently Asked Questions about P0102
What does the MAF sensor circuit low input code P0102 mean?
The powertrain control module logged P0102 due to a low input fault in the MAF sensor circuit.
Is it safe to drive with the MAF sensor circuit low input code P0102 active?
Yes, but drive carefully to avoid stalling.
How much does it cost to repair a MAF sensor circuit low input code P0102 fault?
Cleaning the sensor is cheap ($15). A new MAF sensor is $120-$250, and labor is $70-$150.
What are the common causes of the MAF sensor circuit low input code P0102?
Trigger conditions for the MAF sensor circuit low input code P0102 include: Dirty or contaminated MAF sensor elements., Intake air leaks or cracked intake boot downstream of the sensor., Failed MAF sensor assembly..
Can I clear the check engine light for MAF sensor circuit low input code P0102?
Clear the code with a scanner to verify that the sensor readings rise smoothly.
Will the MAF sensor circuit low input code P0102 cause an inspection failure?
Causes incorrect fuel-air ratios, increasing unburned tailpipe emissions.