OBD · Air intake and boost
P0101 Mass air flow sensor range or performance
What this code means
P0101 is a generic OBD code shared by all manufacturers since 2001 for petrol and 2004 for diesel. It relates to: air intake and boost. The code tells you what the ECU measured as abnormal, not necessarily which part to replace.
Most common causes
- Dirty mass air flow sensor#1
- Intake air leak#2
A hiss at idle with an unstable idle often means a split hose or intake gasket.
Cost of related repairs
| Independent garage | Main dealer | |
|---|---|---|
| Mass air flow sensor | £90 – £255 | £115 – £365 |
How to read this code
An OBD scanner plugged into the 16-pin socket under the steering wheel reads and clears codes. Bluetooth models cost £20 to £40. Clearing a code without fixing the fault is pointless: it comes back.
Related problems
Frequently asked questions
What does code P0101 mean?
P0101: Mass air flow sensor range or performance. P0101 is a generic OBD code shared by all manufacturers since 2001 for petrol and 2004 for diesel. It relates to: air intake and boost. The code tells you what the ECU measured as abnormal, not necessarily which part to replace.
Can I drive with code P0101?
Fix soon. Drive gently and as little as possible. The fault can get worse and damage other parts.
How much does it cost to fix P0101?
Mass air flow sensor: £90 – £255.
How to read this code
An OBD scanner plugged into the 16-pin socket under the steering wheel reads and clears codes. Bluetooth models cost £20 to £40. Clearing a code without fixing the fault is pointless: it comes back.