System: Powertrain (P-Code)
SAE Standard (Generic)
Family: EVAP Reference Orifice Performance
Code P043E: EVAP System Leak Detection Reference Orifice Low Flow
Diagnostic & Technical Explanation
Code P043E (EVAP System Leak Detection Reference Orifice Low Flow) sets when the EVAP monitor's calibrated reference orifice — used to define the exact flow rate that represents the small-leak threshold during a self-test — reads too much or too little flow compared to its known-good calibration value. Causes are a partially clogged reference orifice, a leak in the reference-orifice plumbing itself, or a failing leak-detection module that cannot regulate flow through the reference path.
First-listed procedure
Rank #1
Clean or clear the reference orifice fitting
Easy DIY
This is the first procedure in the authored
consideration order, not a measured cause likelihood. Execute it only when its prerequisites
and diagnostic findings support it. Its cost and labor estimates (where known), the step-by-step procedure and the
remaining 3 procedure(s) are in the licensed dataset. Ordering context.
Full family: EVAP Reference Orifice Performance
What this page does not show
This page publishes the fault mechanism and the code index. The licensed dataset adds, for
every one of the 15,886 codes, the full authored repair set (56,729 procedures in total)
with the fields deliberately withheld here:
- Procedures 2..n after the first-listed procedure
- Aftermarket parts cost ranges in USD (
est_parts_cost_min/max_usd)
- Professional labor-hour estimates (
est_labor_hours)
- Step-by-step diagnostic and repair instructions
- Replacement-part mappings and catalog lookups
- 6,637 manufacturer-specific OEM codes across 32 makes ($149 tier)