Mazda
SKYACTIV-D cylinder 1 injection quantity too low (from idle smoothness check). Rough idle or knock; often injector wear or sensor signals.
P1051 fault code: what it means
P1051: SKYACTIV-D cylinder 1 injection quantity too low (from idle smoothness check). Rough idle or knock; often injector wear or sensor signals.
Usual causes, most likely first
- fuel injector No.1 wear or sticking
- low fuel or air in fuel
- input sensor fault (CKP, rail pressure, ECT)
- injector code not programmed
P1051 by make
What the repair usually costs
- Throttle body clean and idle relearnNZ$90–NZ$190 · A$100–A$200
- Parking sensor replace, one sensorNZ$130–NZ$520 · A$130–A$510
- Petrol fuel injectors (port injection, set)NZ$430–NZ$1,420 · A$400–A$1,360
- Coil packs and spark plugs (4-cylinder)NZ$280–NZ$1,000 · A$260–A$920
Not sure what P1051 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.