Faulty leak detection pump or module (worn or damaged orifice); Disconnected or cracked hose at the pump; Faulty vent or changeover valve in the pump; Wiring fault to the pump; Moisture or debris inside the pump.

How much does it cost to fix P043F?

Usually 80–600 € at an independent workshop in Europe, depending on which part is at fault.

P043F EVAP leak detection reference orifice high flow

What P043F means

Some EVAP systems measure flow through a small reference orifice to calibrate the leak test. P043F means the flow through that orifice was higher than expected, so the leak detection pump or module cannot give a valid result. The engine is not affected.

P043F is a generic SAE J2012 code: it means the same on every make. The exact cause still depends on the car, so read the freeze-frame data before replacing parts.

At a glance

Severity: Medium
Typical repair cost: 80–600 €
Workshop time: 0.7–3 h
Repair difficulty: Medium
DIY possible: No
Check engine light: Yes
Affects emissions test: Yes

Parts and labour at an independent workshop in Europe. Main dealers charge more; the cause decides the bill, not the code.

Symptoms

Check engine light on
Car drives normally
EVAP readiness monitor not complete
Technical inspection failure

Common causes

Faulty leak detection pump or module (worn or damaged orifice)
Disconnected or cracked hose at the pump
Faulty vent or changeover valve in the pump
Wiring fault to the pump
Moisture or debris inside the pump

Can I keep driving with P043F?

Yes, you can keep driving. Have it repaired within one or two weeks.

What to check first

Inspect the hoses connected to the leak detection pump
Check the pump wiring and connector
Run the EVAP leak test with a scan tool and compare readings with specification
Replace the leak detection pump or module if it fails the test

Related codes

Data: TORKO fault-code catalogue, built on OBDex (CC0-1.0) and reviewed against workshop practice. Informational only — it does not replace a diagnosis by a mechanic.
Updated: 2026-10-24