P0451 Code: Evaporative Emission Control System Pressure Sensor Range/Performance
🟢 Low severity · drivable
Safe to drive — this is an emissions-system fault, not an engine problem. Fix it before your next emissions test.
What P0451 means
The EVAP system pressure sensor is reporting a reading that's out of the expected range. This sensor monitors the pressure inside the EVAP system to detect leaks.
Symptoms
- Check engine light is on
- Usually no driving symptoms
Common causes
- most common: Faulty EVAP pressure sensor
- common: Damaged wiring or loose connector
- less common: Corroded sensor connector
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Replace the EVAP pressure sensor | Yes | $50–150 |
| Repair damaged sensor wiring | Mechanic | $50–150 |
Frequently asked questions
Can I drive with a P0451 code?
Yes. It's an emissions fault and won't affect drivability.
What is the most common cause of P0451?
A faulty EVAP pressure sensor.
How much does it cost to fix a P0451?
Typically $50–$150 for a new pressure sensor.
Related codes
P0452
P0452 Code: Evaporative Emission Control System Pressure Sensor Low Input
P0453P0453 Code: Evaporative Emission Control System Pressure Sensor High Input
P0450P0450 Code: EVAP System Pressure Sensor/Switch A Circuit
P0451 by vehicle brand
Causes and repair costs for P0451 differ between makes. Pick your brand for the specifics.
Toyota
P0451 on a Toyota
HondaP0451 on a Honda
FordP0451 on a Ford
ChevyP0451 on a Chevy
NissanP0451 on a Nissan
BMWP0451 on a BMW
Mercedes-BenzP0451 on a Mercedes-Benz
VolkswagenP0451 on a Volkswagen
HyundaiP0451 on a Hyundai
SubaruP0451 on a Subaru
MazdaP0451 on a Mazda
JeepP0451 on a Jeep
GMCP0451 on a GMC
LexusP0451 on a Lexus
VolvoP0451 on a Volvo
Related guide: How to Reset a Check Engine Light →
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.