P1174 fault code: what it means

P1174: Fuel trim additive adaptation fault, bank 1.

Engine and gearbox (powertrain) · Minor

Usual causes, most likely first

vacuum leak
faulty oxygen sensor
fuel pressure fault

P1174 by make

BMW

Fuel trim additive adaptation fault, bank 1.

Usual causes: vacuum leak; faulty oxygen sensor; fuel pressure fault

Land Rover

Right bank mixture adaptation over time too large (lean).

Usual causes: vacuum or breather leak; faulty MAF; low fuel pressure

Mini

Fuel trim additive adaptation fault, bank 1.

Usual causes: vacuum leak; faulty oxygen sensor; fuel pressure fault

Volvo

Fuel trim cylinder balance fault (bank 1). One or more cylinders are richer or leaner than the others.

Usual causes: dirty or failing injector; intake leak near one cylinder

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
Direct-injection petrol injectors (set)NZ$1,490–NZ$3,850 · A$1,350–A$3,520
High-pressure fuel pump (GDI petrol or common-rail diesel)NZ$1,140–NZ$4,280 · A$1,060–A$3,800

Not sure what P1174 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.