P1083 fault code: what it means

P1083: Fuel mixture lean on bank 1. Vacuum leaks are the classic BMW cause; rough idle and hesitation.

Engine and gearbox (powertrain) · Costly if missed

Usual causes, most likely first

1. vacuum or crankcase vent leak
2. faulty MAF sensor
3. clogged injector
4. faulty oxygen sensor

P1083 by make

What the repair usually costs

• Air-fuel ratio / front O2 sensor replace (upstream)NZ$270–NZ$750 · A$260–A$730
• O2 sensor replace (downstream / after cat)NZ$180–NZ$480 · A$180–A$460
• MAF (mass air flow) sensor replaceNZ$170–NZ$660 · A$160–A$600
• Throttle body clean and idle relearnNZ$90–NZ$190 · A$100–A$200

Not sure what P1083 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.