P0103 - Mass or Volume Air Flow Circuit High Input

MAF signal voltage/reading is too high.

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Code Overview

MAF signal voltage/reading is too high.

Common Causes

• Failing or contaminated mass air flow sensor
• Short to voltage in the MAF signal circuit
• Oil contamination from an oiled filter
• Incorrect intake setup or turbulence at the sensor

Symptoms

• Rich-running behavior or loaded-up idle
• Hesitation or surge during acceleration
• Poor fuel economy

Diagnostic Steps

1. Inspect the MAF wiring for short-to-voltage damage
2. Inspect and clean the MAF sensor if contamination is present
3. Check for oil contamination or an aftermarket intake affecting the signal
4. Compare live MAF readings to expected airflow at idle and under load

Repair Difficulty

Moderate

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