P0103
Medium SeverityMass Air Flow Sensor Circuit High Input
Fuel System
What Does P0103 Mean?
The MAF sensor is reading higher than expected airflow. This causes the engine to run rich. Could be a sensor fault or an intake leak.
Common Fix
Replace MAF sensor
Estimated Cost (DIY)
$40 - $150
Symptoms
- ⚠️Rich running (black exhaust)
- ⚠️Poor fuel economy
- ⚠️Check engine light
- ⚠️Rough idle
Common Causes
Faulty MAF sensorlikely
Short circuit in MAF wiringpossible
Air leak in intake bootpossible
Aftermarket air filter issuepossible
How to Diagnose P0103
- 1Inspect MAF sensor connector
- 2Check intake duct for cracks
- 3Clean MAF sensor
- 4Test MAF output with scan tool
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Frequently Asked Questions
- What causes P0103?
- Usually a failed MAF sensor or a short in the sensor wiring. Sometimes caused by an oiled aftermarket air filter contaminating the sensor element.
- Can an oiled air filter cause P0103?
- Yes — oiled aftermarket filters (like some K&N filters) can contaminate the MAF sensor wire, causing false high readings.