P0100 🟠 Élevé ⚠️ Do not drive

Mass Air Flow (MAF) Sensor Circuit Malfunction

The MAF sensor measures air entering the engine. A complete failure means the ECU cannot calculate how much fuel to inject — expect severe running issues.

💷

Average repair cost

£9 — £250

🔍 Symptoms

  • → Check engine light on
  • → Major power loss
  • → Frequent stalling
  • → Hard starting
  • → Very high fuel consumption

⚙️ Common Causes

  1. 1Dirty MAF sensor (oil from air filter, dust)
  2. 2Failed MAF sensor
  3. 3Cut wiring or loose connector
  4. 4Air leak after the MAF

🔧 Recommended Fixes

  1. 1Clean MAF with MAF cleaner spray (~£9) — always try this first
  2. 2Check wiring and connector
  3. 3Check intake duct for air leaks
  4. 4Replace MAF sensor if cleaning fails (~£60-200)

🛒 Recommended Parts (Amazon UK)

MAF sensor cleaner spray~£9
View on Amazon UK →
Replacement MAF sensor~£50-180
View on Amazon UK →
Replacement air filter~£10-18
View on Amazon UK →

Affiliate links — same price for you, we may earn a small commission.

Frequently Asked Questions

Can I clear this code without fixing it?

Yes, but it will return if the underlying issue isn't fixed. Clearing a code only tells you if the problem is permanent or intermittent.

Will this code fail an MOT?

Yes — this code will likely cause an MOT failure. Get it repaired before your test.