P252F fault code: what it means

P252F: SkyActiv-D: engine oil level too high. Usually diesel getting into the oil during DPF regens; Mazda released software and a new dipstick for early CX-5s.

Engine and gearbox (powertrain) · Costly if missed

Usual causes, most likely first

diesel dilution from frequent or interrupted DPF regens
oil data not reset at last oil change
overfilled at service

P252F by make

Mazda

SkyActiv-D: engine oil level too high. Usually diesel getting into the oil during DPF regens; Mazda released software and a new dipstick for early CX-5s.

Usual causes: diesel dilution from frequent or interrupted DPF regens; oil data not reset at last oil change; overfilled at service

What the repair usually costs

Basic service: engine oil and filter change (car)NZ$120–NZ$260 · A$120–A$260
Basic service: engine oil and filter change (SUV / diesel ute / 4WD)NZ$190–NZ$370 · A$180–A$360
Basic service: engine oil and filter change (European)NZ$220–NZ$420 · A$210–A$400

Not sure what P252F 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.