OBD-II code · Powertrain (generic)
P018F Fuel System Over Pressure Relief Valve Frequent Activation
The mechanical pressure relief valve has activated repeatedly within a short window — pressure regulation is failing more than once.
Is it safe to drive with P018F?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyRegulator intermittently sticking
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–6 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Pressure Relief Valve, Fuel Pressure Regulator
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.