What does code P043E mean?

Q: What does code P043E mean?

EVAP System Leak Detection Reference Orifice Low Flow. P043E means the engine computer detected that the EVAP (evaporative emission) system's leak detection reference orifice is flowing less than expected during the self-test. The computer uses a calibrated orifice as a baseline to judge whether the fuel system can hold pressure or vacuum, and this code sets when the reference measurement itself is out of range.

DTC codes / P04xx · Auxiliary emission controls / P043E

P043EEVAP System Leak Detection Reference Orifice Low Flow

P043E means the engine computer detected that the EVAP (evaporative emission) system's leak detection reference orifice is flowing less than expected during the self-test. The computer uses a calibrated orifice as a baseline to judge whether the fuel system can hold pressure or vacuum, and this code sets when the reference measurement itself is out of range.

SystemPowertrain

Code typeGeneric (all makes)

SeverityLow

Fix difficultyIntermediate

AreaAuxiliary emission controls

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.