P0100 fault code: what it means

P0100: Mass air flow (MAF) sensor circuit fault; the engine computer is not getting a usable airflow signal.

Engine and gearbox (powertrain) · Minor

Usual causes, most likely first

loose or corroded MAF connector
broken MAF wiring, power or earth
failed MAF sensor

P0100 by make

Volvo

Mass air flow sensor circuit fault.

Usual causes: failed MAF sensor; MAF wiring or connector

What the repair usually costs

MAF (mass air flow) sensor replaceNZ$170–NZ$660 · A$160–A$600

Not sure what P0100 means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.