2009 — 2011
3.0L V6 HDi (DT20C)
Diesel
Execute a full-lock turn at low speed and listen for knocking or clicking sounds from the front suspension. | Note: The 407 V6 uses a complex double-wishbone setup. Lower swivel hubs and ball joints are high-wear items in New Zealand due to heavy engine weight and road camber.
Accelerate to highway speeds and monitor for 'thumping' or harsh downshifts between 3rd and 2nd gear when coming to a stop. | Note: The Aisin AM6 6-speed automatic transmission often suffers from valve body wear. Frequent 'sealed for life' claims lead to fluid degradation and costly rebuilds.
Inspect the 'V' of the engine and the plastic coolant housing (Y-pipe) for signs of pink/white crusty residue. | Note: The DT20C cooling system relies on plastic components that become brittle. A failure here leads to rapid overheating, which the V6 diesel does not tolerate well.
Toggle the AMVAR electronic suspension button (Sport/Comfort) and feel for a distinct change in damping stiffness. | Note: The V6 features electronically controlled dampers. If these are leaking or the actuators fail, replacement parts are significantly more expensive than standard 407 shocks.
Oil and filter change using strictly Low SAPS 5W-30 C2 oil to protect the Diesel Particulate Filter (DPF).
Replacement of the fuel filter and a transmission fluid 'drain and fill' to extend the life of the Aisin gearbox.
Critical timing belt, tensioner, and water pump replacement; the DT20C engine is interference, so failure is catastrophic.
Verify Eolys DPF additive fluid levels and top up if 'Particle Filter' warnings are present.
Inspect the front 'double-wishbone' lower swivel joints for play or boot tears.
Check the condition of the crankshaft pulley (harmonic balancer) for perishing rubber.
Scan for 'Depollution System Fault' codes related to the EGR valves which clog with short-trip usage.
Test dual-zone climate control flap operation; the heater box blend flaps are known to snap.
Estimated repair costs if issues arise
Preventative maintenance required every 10 years or 150k km (100k km recommended for NZ conditions).
Specialist parts usually sourced from Europe; labor is intensive due to sensor integration.
Common fix for shift flares and harsh engagement in the Aisin 6-speed auto.
Required if the vehicle has been used primarily for short city commutes in NZ.
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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