P043E fault code: what it means

P043E: EVAP reference orifice low flow on a Lexus: the key-off EVAP leak test pump cannot pull through its reference orifice.

Engine and gearbox (powertrain) · Minor

Usual causes, most likely first

blocked canister pump module filter or vent hose
failed canister pump module

P043E by make

Lexus

EVAP reference orifice low flow on a Lexus: the key-off EVAP leak test pump cannot pull through its reference orifice.

Usual causes: blocked canister pump module filter or vent hose; failed canister pump module

Toyota

EVAP leak detection reference orifice low flow: the key-off EVAP leak test pump (canister pump module) cannot pull through its reference orifice. Common on Toyota hybrids.

Usual causes: blocked canister pump module filter or vent hose; failed canister pump module; water or dirt in the vent line

Not sure what P043E 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.