P014C fault code: what it means

P014C: Front A/F sensor 1 slow response (rich to lean). The sensor is slow to react; fuel economy and emissions suffer.

Engine and gearbox (powertrain) · Minor

Usual causes, most likely first

aged A/F sensor 1
wiring or connector fault
exhaust leak before the sensor

P014C by make

Nissan

Front A/F sensor 1 slow response (rich to lean). The sensor is slow to react; fuel economy and emissions suffer.

Usual causes: aged A/F sensor 1; wiring or connector fault; exhaust leak before the sensor

Subaru

Front A/F sensor slow response rich to lean. Usually an ageing sensor.

Usual causes: aged A/F sensor; exhaust leak

Not sure what P014C 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.