P0102 — MAF Circuit Low Input

CAUTIONIs it safe to drive? The MAF is reading too low (or no signal). Driveable but the mixture will be off.

What P0102 means

The airflow signal is below the expected range — often a wiring/connector issue or a failed sensor, sometimes a big air leak.

Most likely causes (in order)

  1. MAF connector / wiring (check first)
  2. Failed MAF sensor
  3. Large air leak after the MAF
  4. Blown sensor fuse

Symptoms you might notice

What to check first

Back-probe the MAF signal and power/ground; wiggle-test the connector. Compare g/s to the displacement rule.

Repair cost & difficulty

Parts
$20–350
Labor
0.3–1 hr
Difficulty
DIY-friendly

Related codes

P0101P0103
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