Block of codes
P24xx codes: EGR and particulate filter
This block brings together the codes from P2400 to P247D in the glossary. Open yours to see what it means, its causes and whether you can keep driving.
Reviewed by Daniel Morales, founder of Reprorace SL, on
What this block covers
Emission control
The catalytic converter, oxygen sensors, EGR, fuel vapor system (EVAP), particulate filter and NOx reduction clean the exhaust. A fault here raises pollution and may make the car fail its inspection; left alone, some end in a bigger fault or in limp-home mode.
Fuel and air metering
The engine measures the incoming air and meters the fuel so the mixture is right; the throttle, the accelerator pedal and the turbo are here too. A fault usually shows as higher fuel use, jerking, lack of power or hard starting.
The 65 codes of the block
- P2400EVAP system leak detection pump, control circuit open
- P2401EVAP system leak detection pump, control circuit: signal low
- P2402EVAP system leak detection pump, control circuit: signal high
- P2403EVAP system leak detection pump, sense circuit open
- P2404EVAP system leak detection pump, sense circuit: range/performance
- P2405EVAP system leak detection pump, sense circuit: signal low
- P2406EVAP system leak detection pump, sense circuit: signal high
- P2407EVAP system leak detection pump, sense circuit: intermittent/erratic
- P2408Fuel cap sensor/switch, circuit: malfunction
- P2409Fuel cap sensor/switch, circuit: range/performance
- P2410Fuel cap sensor/switch, circuit: signal low
- P2411Fuel cap sensor/switch, circuit: signal high
- P2412Fuel cap sensor/switch, circuit: intermittent/erratic
- P2413EGR system: performance
- P2414O2 sensor (bank 1, sensor 1): exhaust sampling error
- P2418EVAP system switching valve, control circuit open
- P2419EVAP system switching valve, control circuit: signal low
- P2421EVAP system vent valve: stuck open
- P2422EVAP system vent valve: stuck closed
- P2423HC adsorption catalyst (bank 1): efficiency below threshold
- P2424HC adsorption catalyst (bank 2): efficiency below threshold
- P2425EGR cooling valve, control circuit open
- P2426EGR cooling valve, control circuit: signal low
- P2427EGR cooling valve, control circuit: signal high
- P2428Exhaust gas temperature (bank 1): too high
- P2429Exhaust gas temperature (bank 2): too high
- P242FParticulate filter: restriction - ash accumulation (bank 1)
- P2430AIR system air flow/pressure sensor (bank 1), circuit: malfunction
- P2431AIR system air flow/pressure sensor (bank 1), circuit: range/performance
- P2432AIR system air flow/pressure sensor (bank 1), circuit: signal low
- P2433AIR system air flow/pressure sensor (bank 1), circuit: signal high
- P2434AIR system air flow/pressure sensor (bank 1), circuit: intermittent/erratic
- P2435AIR system air flow/pressure sensor (bank 2), circuit: malfunction
- P2436AIR system air flow/pressure sensor (bank 2), circuit: range/performance
- P2437AIR system air flow/pressure sensor (bank 2), circuit: signal low
- P2438AIR system air flow/pressure sensor (bank 2), circuit: signal high
- P2439AIR system air flow/pressure sensor (bank 2), circuit: intermittent/erratic
- P2440AIR system switching valve (bank 1): stuck open
- P2441AIR system switching valve (bank 1): stuck closed
- P2442AIR system switching valve (bank 2): stuck open
- P2443AIR system switching valve (bank 2): stuck closed
- P2444AIR system pump (bank 1): stuck on
- P2445AIR system pump (bank 1): stuck off
- P2446AIR system pump (bank 2): stuck on
- P2447AIR system pump (bank 2): stuck off
- P244AParticulate filter differential pressure (bank 1): too low
- P244BParticulate filter differential pressure (bank 1): too high
- P2452Particulate filter pressure sensor A, circuit: malfunction
- P2453Particulate filter pressure sensor A, circuit: range/performance
- P2454Particulate filter pressure sensor A, circuit: signal low
- P2455Particulate filter pressure sensor A, circuit: signal high
- P2456Particulate filter pressure sensor A, circuit: intermittent/erratic
- P2457EGR cooler A: efficiency below threshold
- P2458Particulate filter regeneration duration (bank 1): malfunction
- P2459Particulate filter regeneration frequency (bank 1): malfunction
- P245AEGR cooler bypass (bank 1), control circuit open
- P245BEGR cooler bypass (bank 1), control circuit: range/performance
- P245CEGR cooler bypass (bank 1), control circuit: signal low
- P245EParticulate filter pressure sensor B, circuit: malfunction
- P245FParticulate filter pressure sensor B, circuit: range/performance
- P2463Particulate filter: restriction - soot accumulation (bank 1)
- P2478Exhaust gas temperature (bank 1, sensor 1): out of range
- P2479Exhaust gas temperature (bank 1, sensor 2): out of range
- P247CExhaust gas temperature (bank 2, sensor 1): out of range
- P247DExhaust gas temperature (bank 2, sensor 2): out of range
Other blocks
Read your car's fault codes on your phone
With an ECO-LITE in the OBD socket you see the codes in your account, with the data captured when the fault happened, and your workshop can check them remotely, always with your permission.
Keep reading
- OBD fault codes: what each one means
- Check engine light on: what to do
- How to read and clear your car's fault codes
- Will your car pass its MOT or inspection with the engine light on?
- Wi-Fi OBD2 reader: which one to choose
- Reading fault codes by car make
- Remote OBD diagnostics: what it is, how it works and what it can't do
- Vehicle diagnostics glossary