PowertrainP0402
CautionSeverity: Caution - get it checked when you can
Exhaust Gas Recirculation Flow Excessive Detected
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 42
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P0402 | Turbocharger Solenoid Valve, Turbine Inlet. Position Sensor. Operation Failure Brand | Powertrain |
| BAIC Motor | P0402 | Exhausted Gas Recirculation (EGR) flow too high Brand | Powertrain |
| Mercedes-Benz | P0402 | Exhaust Gas Recirculation Flow Excessive Detected SAE | Powertrain |
| BMW | P0402 | Exhaust Gas Recirculation Excessive Detected Brand | Powertrain |
| BYD | P0402 | EGR flow excessive Brand | Powertrain |
| Chery | P0402 | EGR flow excessive Brand | Powertrain |
| Chrysler | P0402 | Exhaust Gas Recirculation Flow Excessive Detected SAE | Powertrain |
| Daewoo | P0402 | Exhaust Gas Recirculation Valve Stuck Brand | Powertrain |
| Daihatsu | P0402 | EGR flow exceeded Brand | Powertrain |
| DFFS | P0402 | Fuel filler cap sensor failure Brand | Powertrain |
| DFFX | P0402 | EGR flow excessive Brand | Powertrain |
| DFXK | P0402 | EGR flow excessive Brand | Powertrain |
| EOBD | P0402 | EGR 'A' vooluhulk liiga suur Brand | Powertrain |
| Ford | P0402 | Exhaust Gas Recirculation Flow Excessive Detected SAE | Powertrain |
| Geely | P0402 | EGR flow excessive Brand | Powertrain |
| GM | P0402 | Exhaust gas recirculation (EGR) flow excessive Brand | Powertrain |
| Great Wall | P0402 | EGR flow excessive Brand | Powertrain |
| Hafei | P0402 | EGR flow excessive Brand | Powertrain |
| Holden | P0402 | Exhaust Gas Recirculation Valve 1 Brand | Powertrain |
| Honda | P0402 | Exhaust Gas Recirculation Flow Excessive Detected SAE | Powertrain |
| Hyundai | P0402 | Exhaust Gas Recirculation Flow Excessive Detected SAE | Powertrain |
| Isuzu | P0402 | Exhaust Gas Recirculation Flow Excessive Detected SAE | Powertrain |
| Land Rover | P0402 | Exhaust Gas Recirculation Flow Excessive Detected SAE | Powertrain |
| Mahindra | P0402 | EGRC-BPT VLV Brand | Powertrain |
| Maserati | P0402 | Exhaust Gas Recirculation (EGR) Flow Excessive Detected Brand | Powertrain |
| Mazda | P0402 | Exhaust Gas Recirculation Flow Excessive Detected SAE | Powertrain |
| Mitsubishi | P0402 | EGR flow excessive Brand | Powertrain |
| Nissan | P0402 | EGRC-BPT valve Brand | Powertrain |
| Opel | P0402 | Exhaust gas recirculation (EGR) flow excessive Brand | Powertrain |
| Perodua | P0402 | EGR flow exceeded Brand | Powertrain |
| Peugeot | P0402 | Exhaust Gas Recirculation Flow Excessive Detected SAE | Powertrain |
| Porsche | P0402 | Exhaust Gas Recirculation Flow Excessive Detected SAE | Powertrain |
| Proton | P0402 | EGR flow excessive Brand | Powertrain |
| Renault | P0402 | EGRC-BPT Vlv Brand | Powertrain |
| Saab | P0402 | Durchfluss Abgasrückführung zu hoch Brand | Powertrain |
| MG (SAIC) | P0402 | Rear Left pretensioner Leakage to plus on squib Brand | Powertrain |
| Subaru | P0402 | Exhaust Gas Recirculation Flow Excessive Detected SAE | Powertrain |
| Suzuki | P0402 | Exhaust Gas Recirculation 'A' Flow Excessive Detected Brand | Powertrain |
| SWM Motor | P0402 | Excessive exhaust gas recirculation (EGR) flow Brand | Powertrain |
| Tata | P0402 | EGR Control Consistency Brand | Powertrain |
| Toyota | P0402 | Fuel filler cap sensor failure Brand | Powertrain |
| Volkswagen | P0402 | EGR system: excessive flow 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 2
These 7-character codes are manufacturer-specific variants of P0402 and may be reported by some scan tools.
6Related codes
Browse Pxxx codes or P040xx codes.