P0030 fault code: what it means

P0030: Front (pre-cat) oxygen sensor heater circuit fault, bank 1. On BMW six-cylinders bank 1 is cylinders 1-3.

Engine and gearbox (powertrain) · Minor

Usual causes, most likely first

front oxygen sensor heater failed
oxygen sensor connector or wiring damage
blown fuse

P0030 by make

BMW

Front (pre-cat) oxygen sensor heater circuit fault, bank 1. On BMW six-cylinders bank 1 is cylinders 1-3.

Usual causes: front oxygen sensor heater failed; oxygen sensor connector or wiring damage; blown fuse

Mini

Front (pre-cat) oxygen sensor heater circuit fault.

Usual causes: front oxygen sensor heater failed; sensor wiring or connector; blown fuse

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

Not sure what P0030 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.