P0102
Medium SeverityMass Air Flow Sensor Circuit Low Input
Fuel System
What Does P0102 Mean?
The MAF sensor is reporting lower airflow than expected. The engine thinks less air is entering than actually is, causing a lean condition.
Common Fix
Replace MAF sensor
Estimated Cost (DIY)
$40 - $150
Symptoms
- ⚠️Stalling
- ⚠️Hard starting
- ⚠️Loss of power
- ⚠️Lean misfire
Common Causes
How to Diagnose P0102
- 1Check MAF sensor connector
- 2Clean MAF sensor
- 3Inspect air filter
- 4Check for disconnected vacuum hose
OEM Diagnostic Flowchart
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Related Resources
Repair guides, symptom pages, and wiring diagrams related to P0102.
Exact Vehicle Hubs
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Open the exact vehicle hub for a repair workflow commonly associated with P0102.
Open the exact vehicle hub for a repair workflow commonly associated with P0102.
Open the exact vehicle hub for a repair workflow commonly associated with P0102.
Open the exact vehicle hub for a repair workflow commonly associated with P0102.
Open the exact vehicle hub for a repair workflow commonly associated with P0102.
Exact Repair Workflows
Browse →Open the exact repair flow most commonly associated with P0102 on this vehicle.
Open the exact repair flow most commonly associated with P0102 on this vehicle.
Open the exact repair flow most commonly associated with P0102 on this vehicle.
Open the exact repair flow most commonly associated with P0102 on this vehicle.
Open the exact repair flow most commonly associated with P0102 on this vehicle.
Open the exact repair flow most commonly associated with P0102 on this vehicle.
Related Codes
The MAF sensor is reading outside the expected range for current engine conditions. Could be dirty, defective, or have an air leak after the sensor.
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.
The engine is running lean on bank 1 — too much air or not enough fuel. The ECM has maxed out its fuel trim trying to compensate. Common causes include vacuum leaks and dirty MAF sensors.
Frequently Asked Questions
- Is P0102 the same as P0101?
- P0102 specifically means low airflow reading, while P0101 is out-of-range. P0102 usually means the sensor has failed rather than just being dirty.
- Can I drive with P0102?
- The car may stall or run very poorly. Drive only if necessary and get it fixed quickly.
Related Repair Guides
If your vehicle has triggered P0102, these DIY repair guides may help: