P1130 fault code: what it means

P1130: Ford code: front O2 sensor (bank 1) not switching, fuel trim at its limit.

Engine and gearbox (powertrain) · Minor

Usual causes, most likely first

failed O2 sensor
vacuum or exhaust leak
fuel pressure fault

P1130 by make

Ford

Ford code: front O2 sensor (bank 1) not switching, fuel trim at its limit.

Usual causes: failed O2 sensor; vacuum or exhaust leak; fuel pressure fault

Porsche

Mixture adaptation, idle range, bank 2: running lean at idle. Air/oil separator, oil filler cap or intake leaks are typical.

Usual causes: air/oil separator (AOS) or its hoses leaking; loose intake hose or oil filler cap; faulty MAF sensor; low fuel pressure

Toyota

A/F sensor circuit range/performance, bank 1 sensor 1 (older Toyota code). The front air-fuel sensor is out of range.

Usual causes: aged A/F sensor; exhaust leak before the sensor; sensor wiring fault

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
Direct-injection petrol injectors (set)NZ$1,490–NZ$3,850 · A$1,350–A$3,520

Not sure what P1130 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.