P2195 fault code: what it means

P2195: Bank 1 front O2 / air-fuel sensor signal is stuck lean.

Engine and gearbox (powertrain) · Minor

Usual causes, most likely first

intake or vacuum leak
aged front O2 / A/F sensor
low fuel pressure
exhaust leak before the sensor

P2195 by make

Lexus

Front air-fuel ratio sensor signal stuck lean (bank 1 sensor 1). Lexus uses wide-band A/F sensors here.

Usual causes: faulty front air-fuel ratio sensor; A/F sensor wiring or connector fault; air or exhaust leak near the sensor

Toyota

Front air-fuel ratio sensor signal stuck lean (bank 1 sensor 1). Toyota uses a wide-band A/F sensor here, not a normal O2 sensor.

Usual causes: faulty front air-fuel ratio sensor; A/F sensor wiring or connector fault; air leak or exhaust leak near the sensor

What the repair usually costs

Air-fuel ratio / front O2 sensor replace (upstream)NZ$270–NZ$750 · A$260–A$730
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 P2195 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.