2005-2023 Citroen C4 Problems: 8 Known Issues

Owners of first-generation C4 1.6 HDi diesels report turbochargers failing from oil starvation: a 2008 C4 1.6 HDi FAP lost its turbo bearings, a 2006 110 hp owner's turbo blew, and another owner who fitted a new turbo found low oil flow to it. The owners' club FAQ reproduces a Citroën note that oil left polluted by missed or incomplete oil changes starves the turbo bearings and causes repeat failures. It affects 2005–2010 first-generation Citroën C4 hatchbacks and coupés with the 1.6 HDi (DV6) diesel. The linked owner reports give a failure mileage of 58,000 miles.

The EP6 'Prince' 1.6 THP turbo petrol engine (co-developed with BMW) fitted to the C4 from 2008 suffers from timing chain stretch combined with a weak hydraulic tensioner — on pre-2016 engines the chain frequently shows stretch by 60,000-100,000 km. Once stretched, the tensioner can reach its travel limit; if oil pressure drops at idle the chain can jump teeth, throwing cam timing out and in severe cases causing valve-to-piston contact and major engine damage.

The 1.2 PureTech three-cylinder petrol engine runs its timing belt in engine oil, and Citroën's special-coverage terms cover engine lubrication faults caused by premature degradation of that belt. Belt debris left in the oil can clog engine parts, including the brake-assist vacuum pump, which lengthens stopping distances; if it is not maintained properly the engine can fail. It affects the Citroën C4 with the 1.2 PureTech petrol engine: the second generation (produced April 2014–2018, PureTech 110/130) and the third generation (C41, produced from 2020; PureTech 100/130/155). Diesel and electric C4s are not affected. C4s with the 1.2 turbo petrol built March 2013–April 2017 were also recalled (Citroën codes HFC and HLT, EU Safety Gate A12/01504/20 and A12/01042/21) because belt abrasion could damage the vacuum pump.

The owner of a 2006 first-generation C4 VTR Plus 1.6 HDi 110 at about 63,000 miles reports the depollution system warning lighting up on a long motorway drive, clearing, then returning, and concluded it was coming from the diesel particulate filter (DPF). Other members explain that the Eolys additive helps the filter burn off soot, but ash builds up in the filter over time and it can block, especially with mostly slow urban driving. Not every C4 1.6 HDi has a particulate filter: another member says his 2008 C4 1.6 HDi 110 did not have one. This is based on one owner-forum thread, not a manufacturer finding.

Owners of first-generation C4 diesels report EGR valve faults flagged by diagnostics, with hesitation, a flat spot or lack of power. Owners who removed the valve found carbon deposits in it; on one 2.0 HDi the deposits stopped the valve closing, and on another a replacement valve still logged an EGR fault code. It affects 2005–2010 Citroën C4s (first generation, hatchback and coupé) with the 1.6 HDi or 2.0 HDi diesel. The linked owner reports put it at 50,000 km (about 31,100 miles) and 60,000 miles.

Second-generation C4 models manufactured between 2 February 2010 and 20 May 2018 are covered by the Citroen 'stop-drive' airbag recall extended in August 2025: the airbag gas generators (Takata-type inflators) degrade with age and humidity and can rupture when the airbag deploys, projecting metal fragments at occupants. The defect has no warning signs. Citroën issued the stop-drive instruction on 7 August 2025 (DVSA supports it), and DVSA MOT special notice 03-25 tells testers to pass the car as normal but record an advisory that the recall is outstanding.

A rear suspension spring can become detached from its lower locating cup. If it does, driving stability is affected, which may increase the risk of an accident. It affects Citroën ë-C4 (electric) cars built 26 May 2020 to 20 August 2021, covered by UK recall R/2022/023 (manufacturer reference HWH; VIN range VR7******LE509289 to VR7******ME046441). The EU Safety Gate alert A12/00512/22 lists the C4 and ë-C4 under the same production window; a Citroën dealer's VIN check confirms whether your car is included.

Owners of first-generation C4s report body-electronics faults blamed on the BSI body computer: wipers and lights switching on and off by themselves, only the driver's window working, and a boot that would not lock, which one dealer blamed on the BSI. One 2006 owner fixed wiper and stalling faults by repairing a missing component on the BSI board, and another's wipers and lights acted up after heavy rain until a Citroën dealer replaced the unit. A third owner's lights, wipers and warnings were traced to a short on the CAN bus, and replacing the BSI and steering-column COM2000 did not help. It affects 2005–2010 Citroën C4s (first generation, hatchback and coupé) with any engine.