P013A fault code: what it means

P013A: Rear O2 sensor (HO2S) slow to switch from rich to lean on SkyActiv-G. Usually an aged rear sensor.

Engine and gearbox (powertrain) · Minor

Usual causes, most likely first

aged rear O2 sensor
exhaust leak near the sensor
sensor wiring or connector

P013A by make

Mazda

Rear O2 sensor (HO2S) slow to switch from rich to lean on SkyActiv-G. Usually an aged rear sensor.

Usual causes: aged rear O2 sensor; exhaust leak near the sensor; sensor wiring or connector

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

Not sure what P013A 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.