P0451 on a Volvo: Causes, Fixes & Repair Cost

🟢 Low severity · drivable

You can keep driving a Volvo with P0451 — it's an emissions fault, not an engine problem — but fix it before your next emissions test.

What P0451 means on a Volvo

On a Volvo, P0451 means the fuel tank pressure sensor in the EVAP system is reporting a reading outside the expected range. The sensor lets the engine computer monitor fuel vapor pressure in the tank. A bad reading turns on the check engine light but doesn't affect how the car drives.

Is P0451 common on Volvos?

P0451 appears on Volvos as the fuel tank pressure sensor ages, most often on higher-mileage S60, S80, XC60, and XC90 models. The sensor can be part of the fuel pump or canister assembly, which affects the repair cost. It is an emissions fault, not a drivability fault.

Commonly reported on: S60, S80, XC60, XC90.

Symptoms

Check engine light on
Possible faint fuel smell
No change in how the car drives

Common causes

most common: Faulty fuel tank pressure sensor
common: Damaged wiring or loose connector
common: Stuck or faulty EVAP vent valve
less common: Cracked EVAP line

How to fix it

Fix	DIY?	Typical cost
Inspect the sensor wiring and connector	Yes	$10–60
Replace the fuel tank pressure sensor	Mechanic	$130–320
Have the EVAP system smoke tested if the code returns	Mechanic	$50–150