Known faults for the Citroën C6.

Engine / equipment

Citroën C6 (3.0 V6 petrol and HDi)

Period mentioned

2005–2012

Symptoms

Wishbone bushes worn after just three years; the inner shoulder of the tyres wears when straddling speed cushions; a difficult alignment that few garages get right.

Possible cause described

Cases collected by Honest John: new wishbones cost about £660 a pair.

Check for the garage

Check the bushes and inner tyre wear; have the alignment done by an experienced garage.

Cost cited in the source

No verified estimate; ask the garage for a quote.A rough figure from the original database, not an up-to-date quote.

Sources from the original database

Engine / equipment

PSA 2.0 HDi (DW10) and 2.2 HDi (DW12), including the 2.0/2.2 JTD in the Fiat Ulysse and Scudo and the Lancia Phedra

Period mentioned

1998–2015

Symptoms

Particulate filter warning and power loss; rough idle from a dirty EGR; vibration and knocks when starting or in low gears (dual-mass flywheel); smoke or hesitation from injectors at high mileage.

Possible cause described

The engine itself is very robust, but the ancillaries are not: the DPF with Eolys additive clogs in town use, the EGR and its cooler fill with soot, the variable-geometry turbo sticks and the dual-mass flywheel wears. The 136 hp versions have more problems than the 138 to 163 hp ones.

Check for the garage

Read the DPF status and additive level, check the EGR and cooler, check the dual-mass flywheel at start-up and measure injector balance rates.

Cost cited in the source

Forced DPF regeneration: €100–150; new DPF: €800–1,500; rebuilt injector: €200–250A rough figure from the original database, not an up-to-date quote.

Mileage cited in the database: 120,000–180,000 km. This is not a maintenance interval and does not predict a failure.

Sources from the original database