PowertrainP0451
CautionSeverity: Caution - get it checked when you can
Evaporative Emission Control System Pressure Sensor Range/Performance
Key terms: Catalytic converter: cleans the exhaust gases · EGR: exhaust gas recirculation, which cuts harmful gases · EVAP: the system that traps fuel vapour · Oxygen sensor: measures oxygen in the exhaust gas · SAE J2012: the standard generic code list · Powertrain: engine, transmission and emissions
1What it means in plain English
This range covers emissions control (EGR, EVAP, oxygen sensors and the catalytic converter), but some manufacturers also use P04 codes for oil-pressure, brake-fluid and coolant-level warnings.
2Common causes
- Clogged or faulty EGR valve
- EVAP system leak (hoses, canister, fuel cap)
- Faulty oxygen sensor
- Ageing catalytic converter
- Low oil, brake fluid or coolant (on some models)
- Wiring or connector fault
3Can I drive?
Do not assume this code is safe to drive. Check the description: if it names oil pressure, brake fluid, coolant, or a brake fault, stop safely and have it diagnosed before driving. Emissions-only codes (EGR, EVAP, catalyst) should still be checked before an emissions or roadworthiness inspection.
This page gives general information. It is not professional advice. For a definite diagnosis and a repair quote, ask a qualified mechanic to inspect the car.
4Brand data 36
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P0451 | Evaporative Emission Control System Pressure Sensor Range/Performance SAE | Powertrain |
| BAIC Motor | P0451 | Fuel tank pressure sensor performance fault Brand | Powertrain |
| Mercedes-Benz | P0451 | Evaporative Emission Control System Pressure Sensor Range/Performance SAE | Powertrain |
| BMW | P0451 | Evaporative Emission Contr. Syst. Press. Sensor Range/Perform Brand | Powertrain |
| BYD | P0451 | EVAP. emission PRS. sensor range Brand | Powertrain |
| Chery | P0451 | EVAP. emission PRS. sensor range Brand | Powertrain |
| Chrysler | P0451 | Fuel Tank Pressure (FTP) sensor performance Brand | Powertrain |
| Daewoo | P0451 | Fuel Tank Pressure Sensor Range/Performance Brand | Powertrain |
| DFFS | P0451 | Fuel tank pressure sensor performance fault Brand | Powertrain |
| DFFX | P0451 | EVAP. emission PRS. sensor range Brand | Powertrain |
| DFXK | P0451 | Fuel tank pressure sensor performance fault Brand | Powertrain |
| EOBD | P0451 | EVAP-system trykksensor/bryter 'A'-krets område/ytelse Brand | Powertrain |
| Geely | P0451 | EVAP. emission PRS. sensor range Brand | Powertrain |
| GM | P0451 | Fuel tank pressure (FTP) sensor performance Brand | Powertrain |
| Great Wall | P0451 | EVAP. emission PRS. sensor range Brand | Powertrain |
| Hafei | P0451 | EVAP. emission PRS. sensor range Brand | Powertrain |
| Holden | P0451 | Fuel Tank Pressure Sensor Performance Brand | Powertrain |
| Honda | P0451 | Evaporative Emission Control System Pressure Sensor Range/Performance SAE | Powertrain |
| Hyundai | P0451 | Evaporative Emission Control System Pressure Sensor Range/Performance SAE | Powertrain |
| Isuzu | P0451 | Evaporative Emission Control System Pressure Sensor Range/Performance SAE | Powertrain |
| Land Rover | P0451 | Evaporative Emission Control System Pressure Sensor Range/Performance SAE | Powertrain |
| Mitsubishi | P0451 | EVAP. emission PRS. sensor range Brand | Powertrain |
| Opel | P0451 | Fuel tank pressure (FTP) sensor performance Brand | Powertrain |
| Peugeot | P0451 | Evaporative Emission Control System Pressure Sensor Range/Performance SAE | Powertrain |
| Porsche | P0451 | Evaporative Emission Control System Pressure Sensor Range/Performance SAE | Powertrain |
| Proton | P0451 | EVAP. emission PRS. sensor range Brand | Powertrain |
| Saab | P0451 | Prestazioni sensore FTP Brand | Powertrain |
| MG (SAIC) | P0451 | Evaporative Emission System Pressure Sensor/Switch Range/Performance Brand | Powertrain |
| Smart | P0451 | Evaporative Emission Control System Pressure Sensor Range/Performance SAE | Powertrain |
| Sprinter | P0451 | Evaporative Emission Control System Pressure Sensor Range/Performance SAE | Powertrain |
| Subaru | P0451 | Fuel Tank Pressure Sensor Performance Problem Brand | Powertrain |
| Suzuki | P0451 | Evaporative Emission System Pressure Sensor / Switch Range / Performance Brand | Powertrain |
| SWM Motor | P0451 | Fuel tank pressure sensor signal is unreliable Brand | Powertrain |
| Tata | P0451 | Evaporative Emission System Pressure Sensor/Switch Range/Performance Brand | Powertrain |
| Toyota | P0451 | Fuel tank pressure sensor performance fault Brand | Powertrain |
| Volkswagen | P0451 | EVAP system pressure sensor: implausible Brand | Powertrain |
Legend: SAE is the generic J2012 description; Brand is text taken from that manufacturer’s data. Manufacturer rows keep the wording and language of the source data, and non-English text is tagged so screen readers pronounce it correctly.
5Extended variant codes 5
These 7-character codes are manufacturer-specific variants of P0451 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| Mercedes-Benz | P045100 | Der Drucksensor/Druckschalter der Kraftstoffverdunstungsanlage hat Funktionsstörung. Brand | Powertrain |
| SsangYong | P045100 | EVAP. emission system - pressure sensor range/performance Brand | Powertrain |
| Mercedes-Benz | P045111 | Der Drucksensor/Druckschalter der Kraftstoffverdunstungsanlage hat Funktionsstörung. Es liegt ein Kurzschluss nach Masse vor. Brand | Powertrain |
| Mercedes-Benz | P045112 | Der Drucksensor/Druckschalter der Kraftstoffverdunstungsanlage hat Funktionsstörung. Es liegt ein Kurzschluss nach Plus vor. Brand | Powertrain |
| Mercedes-Benz | P045116 | Der Drucksensor/Druckschalter der Kraftstoffverdunstungsanlage hat Funktionsstörung. Der Grenzwert für elektrische Spannung ist unterschritten. Brand | Powertrain |
6Related codes
Browse Pxxx codes or P045xx codes.