Failed MAF sensor. Broken wiring or disconnected connector. Blown fuse in MAF circuit. Water damage to sensor. ECM fault (rare).

Which cars are affected by P0100?

P0100 is most commonly reported on Volkswagen, Audi, BMW, Mercedes-Benz, Vauxhall vehicles, but can appear on any make.

← All fault codes

P0100

High severity

Mass Air Flow (MAF) Sensor Circuit Malfunction

The MAF sensor circuit has a complete failure or is sending no signal. Unlike P0101 (range/performance), this code indicates a total circuit fault — the ECM sees no data at all from the sensor.

Get a full AI diagnosis for your vehicle

Enter your reg plate and fault code — Velocito.ai cross-references technical databases, MOT history, manufacturer recalls, and known fixes to pinpoint the exact cause.

Diagnose P0100 free3 free searches — no card required

Common causes of P0100

1Failed MAF sensor

2Broken wiring or disconnected connector

3Blown fuse in MAF circuit

+2 more causes

Get all causes ranked by likelihood for your specific vehicle — plus the cheapest confirming test for each.

Diagnose P0100 free

Commonly affected vehicles

VolkswagenAudiBMWMercedes-BenzVauxhall

P0100 can appear on any vehicle — these are the makes where it is most frequently reported.

Full diagnosis report

Most likely cause for your vehicle

Based on your vehicle's make, model, year, and MOT history, the most probable cause is identified and ranked by likelihood.

Confirming diagnostic test

The cheapest test to confirm the root cause before replacing any parts — saving time and money on unnecessary work.

Recalls & technical bulletins

Manufacturer recalls and TSBs checked automatically for your specific vehicle, so nothing gets missed.

Unlock the full report

Enter your reg plate to get causes ranked for your specific vehicle, confirming tests, recall checks, and known fixes.

Try 3 free searches

Stop guessing. Start diagnosing.

Enter your reg plate and P0100 — get a full diagnostic report in seconds.

Try 3 free searches

Related fault codes

P0171Medium

System Too Lean (Bank 1)

P0300High

Random/Multiple Cylinder Misfire Detected

P0420Medium

Catalyst System Efficiency Below Threshold (Bank 1)

P0172Medium

System Too Rich (Bank 1)