The DW10C diesel engine is widely used in the Peugeot 308, 3008, 508, Citroen C4, C5, and DS5. Over time, fuel injectors may develop faults that affect performance, starting, and emissions. This guide helps you diagnose injector issues and determine when replacement is required.
Lumpy idle with engine vibration: The DW10C develops a characteristic lumpy idle when injectors begin to fail. The vibration is most noticeable with the engine at operating temperature and in gear at a standstill.
White or grey smoke at startup: Cold-start smoke that takes longer than 30 seconds to clear indicates one or more injectors are not atomising fuel correctly.
Anti-pollution fault message: The PSA 'Anti-pollution fault' warning on the dashboard is often caused by injector issues affecting emissions control.
Reduced power in limp mode: The ECU enters limp mode when injector performance falls outside acceptable parameters, limiting power to protect the engine.
Excessive fuel consumption: DW10C injector failures commonly increase fuel consumption by 10-15%, most noticeable on longer motorway journeys.
Why DW10C injectors fail
fuel contamination
high-pressure wear cycles
carbon buildup
poor fuel quality
internal valve wear
How to diagnose DW10C injector faults
Read fault codes: Connect an OBD-II scanner and note any injector-related codes (P0201–P0204, P2146, P2149). This identifies which cylinder is affected.
Perform a leak-off test: Disconnect the fuel return pipes and route into measuring containers. Run the engine at idle for 60 seconds. Compare volumes per cylinder against manufacturer spec.
Listen for injector tick: Use a mechanic's stethoscope on each injector body. A dead or irregular tick indicates a stuck or failing solenoid.
Check fuel rail pressure: Monitor live fuel rail pressure data via diagnostic tool. Low pressure can mimic injector symptoms and may indicate a fuel pump issue instead.
Inspect for external leaks: Check around injector seals for signs of fuel or combustion gas leakage. Black carbon deposits indicate a blown seal.
Cylinder balance test: Use diagnostic software to run a cylinder contribution test. This electronically disables each injector in turn to measure its effect on engine speed.
P1164 – Fuel injection system malfunction (PSA specific)
P0087 – Fuel rail system pressure too low
P0300 – Random/multiple cylinder misfire
P242F – DPF restriction — ash/soot accumulation
DW10C repair advice
The DW10C requires injector coding via Peugeot Planet/Diagbox or compatible PSA diagnostic tool. On BlueHDi models, check the AdBlue system is functioning correctly after injector replacement. We recommend clearing all fault codes and performing a forced DPF regeneration after fitting new injectors.
The 'Anti-pollution fault' warning covers a range of emissions-related issues. Injector failure is one of the most common causes, alongside DPF and EGR problems.
Is the DW10C the same as the DW10B?
They are related but different engines. The DW10C is the updated Euro 5/6 version with improved fuel injection and emissions systems. Injector part numbers differ between variants.
Can I drive with the anti-pollution fault?
You can drive short distances, but the engine may be in limp mode with reduced power. Prolonged driving risks damage to the DPF and catalytic converter.
How much does DW10C injector replacement cost?
Remanufactured DW10C injectors cost approximately £120-£180 each. A full set of four with fitting typically costs £700-£1,100 including labour.
How much does it cost to replace injectors?
Replacement typically costs £150–£350 per injector depending on brand and engine. A full set of four with professional fitting usually costs £600–£1,200.
Can I drive with a faulty injector?
Driving with a faulty injector can cause engine damage, increased fuel consumption, DPF contamination, and oil dilution. We recommend diagnosis and replacement as soon as possible.
Do new injectors need coding?
Some vehicles require injector coding after replacement using manufacturer-specific diagnostic tools. Many Bosch solenoid units are plug and play. Check your engine guide for specific requirements.
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