P0102
Medium SeverityMass Air Flow Sensor Circuit Low Input
Fuel System
P0102 — Instant Answer
Mass Air Flow Sensor Circuit Low Input
Severity: MEDIUM SEVERITY
Meaning: The MAF sensor is reporting lower airflow than expected. The engine thinks less air is entering than actually is, causing a lean condition.
Safe to drive? Usually yes with caution, but confirm root cause before long trips.
Estimated repair cost: $40 - $150
Most common causes:
- 1. Failed MAF sensor (35-45% of cases)
- 2. Vacuum leak (10-25% of cases)
- 3. Restricted air filter (10-25% of cases)
- 4. Wiring issue to MAF (10-25% of cases)
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.
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Open the exact repair flow most commonly associated with P0102 on this vehicle.
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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.
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Author & Review
Written by AllOEMManuals Editorial Team. Reviewed by ASE-certified technicians and updated with factory-reference checks for fitment-sensitive steps.
This guide was drafted with AI assistance and reviewed for accuracy by a human editor.
Last updated: 2026-05-07