The evap vent valve is stuck shut, so the tank cannot breathe properly. You may notice a hiss when opening the filler cap or slow filling at the pump.
P2422 — also written P2422, P 2422, 2422 — is the OBD-II code for evaporative emission system vent valve stuck closed. Same code, same fix: this page covers every spelling of it.
P2422 is a emissions fault code, typically costing £80–£450 to put right in a UK garage.
What causes P2422?
- Vent valve seized with road dirt
- Blocked charcoal canister
- Water or spider ingress into the vent line
- Wiring fault
How P2422 is fixed
- Replace the vent valve
- Inspect and replace the charcoal canister if saturated
- Clear the vent line
P2422 repair cost in the UK
Most P2422 repairs land between £80–£450 including parts and labour. The spread is wide because the cheap fix (a sensor, a hose, a leak) and the expensive fix (a major component) throw the same code — which is why a proper diagnosis before parts are bought saves the most money.
Can you drive with P2422?
Yes, but the light will fail an MOT on newer cars.
Urgency: low.