2001 — 2004
2.2L I4 HDi (DW12TED4)
Diesel
Accelerate hard in 3rd gear from low RPM to test the Dual Mass Flywheel (DMF). | Note: Listen for vibrations or shuddering. The 2.2 HDi's torque puts significant strain on the DMF; replacement is costly in NZ due to labor.
Monitor the dashboard for 'Antipollution Fault' messages during a sustained 100km/h cruise. | Note: This often indicates a clogged FAP (Diesel Particulate Filter) or low Eolys additive levels, a common maintenance headache for this specific engine.
Operate the indicator stalks and wipers multiple times while turning the steering wheel. | Note: The COM2000 unit (stalk assembly) is prone to failure, causing phantom indicator clicks or headlight flickers. New units are expensive to source locally.
Listen for 'clunking' from the rear when driving over speed bumps or uneven surfaces. | Note: The 406 uses a complex multi-link rear suspension. Worn drop links or transverse arm bushes are common but affect the car's legendary handling.
Intermediate service including high-quality 5W40 or 5W30 synthetic oil and a fresh fuel filter to protect the high-pressure injectors.
Comprehensive inspection of the FAP system and Eolys additive tank level. Brake fluid flush and inspection of the auxiliary drive belt.
Critical timing belt and water pump replacement. Failure to replace this on the DW12TED4 engine will lead to catastrophic engine damage.
Use only Low-SAPS synthetic oil to prolong the life of the Diesel Particulate Filter (FAP).
Inspect the crankshaft pulley (harmonic balancer) for perishing rubber or wobbling.
Clean the Mass Air Flow (MAF) sensor periodically to maintain fuel economy and prevent smoke.
Verify the operation of the engine cooling fans (low and high speeds) to prevent overheating in NZ summer traffic.
Check the condition of the vacuum lines controlling the turbo vane actuator and the swirl flaps (Swirl Valve).
Estimated repair costs if issues arise
Preventative maintenance required every 100k km or 5 years.
High labor cost due to subframe clearance requirements.
Must be done by a specialist with diagnostic software to reset the counter.
Common electrical failure point; parts usually imported from Europe.
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Disclaimer: This report is generated with the assistance of AI analysis based on verified automotive data. While we strive for 100% accuracy, enthusiasts should always conduct physical inspections and consult service records. View Full Disclaimer