Citroën C5
Top diesel with 180 hp and SCR cat. Very punchy with high torque, usually paired with EAT8 automatic. Ideal for heavy SUVs and long-distance vehicles.
Powerful diesel estate flagship
The BlueHDi 180 with 400 Nm and EAT6 is the most powerful and modern engine in the C5 II — Euro 6b-compliant from 2015. Paired with the Hydractive III+ hydropneumatic suspension the C5 II glides on air, while 222 km/h top speed enables effortless motorway legs. For long-distance enthusiasts the most convincing overall package in the C5 range.
Engine Weaknesses 6
BlueHDi engines with SCR urea injection suffer from faulty AdBlue tanks and pumps, especially in winter. The faulty tank unit (pump and sensor integrated) cannot be replaced separately — cost €1,000–2,000. Engine will not start after failure.
Symptoms: AdBlue warning light, engine warning light, start lockout after countdown warning, fault codes.
The BlueHDi DW10F variant is an interference engine. Timing belt replacement requires specific PSA special tools (NTN-SNR kit). Incorrect installation leads to engine damage. Interval: 5 years or 100,000 km.
Symptoms: Sudden engine stall, metallic noises, no restart on snap.
BlueHDi DPF regenerates actively via post-injection. With insufficient running time, unburnt fuel passes into the engine oil (oil dilution). Regular oil level checks and motorway drives for regeneration are mandatory.
Symptoms: DPF warning light, oil level rising, engine warning light, strong diesel smell in oil.
The water pump on the DW10 BlueHDi 180 is belt-driven and can seize on bearing failure, shearing off the timing belt. Documented pre-failure damage on DW10 variants from 50,000 km. Engine damage from valve contact follows.
Symptoms: Squealing from the timing belt area, coolant loss, sudden engine stall with loud bang. After stalling: engine will not restart.
Despite BlueHDi technology, the EGR valve remains susceptible to soot deposits. The intercooler can be internally coated from recirculated EGR exhaust gases with oil mist. Engine warning light and power reduction follow.
Symptoms: Hesitation at 1,500–2,500 rpm, engine warning light, increased fuel consumption.
On the DW10 BlueHDi 180, NOx sensors fail and AdBlue pumps corrode, producing the same fault codes as other BlueHDi variants (P20E8, P20EE). Costly repair due to complete AdBlue tank replacement.
Symptoms: Exhaust aftertreatment fault warning, countdown display until engine lockout, rough idle. Fault codes P20E8/P20EE/P204E. After limit: engine start refused.
Vehicle Weaknesses 5
The optional Hydractive 3+ suspension (standard on Exclusive trim) in the C5 II starts leaking at spheres and cylinders from around 80,000 km. A 'Suspension defective' message appears and the car limits top speed to 90 km/h.
The electric power steering in the C5 II is connected to the BSI control unit. BSI faults or ECU problems cause the power assistance to fail. A frequently reported issue is sudden loss of assist while the engine is running.
The automatic gearbox in the C5 II (2008–2017) shows typical problems pulling away from standstill. Only after firm throttle input does the gearbox engage properly. A gearbox flush or software update often helps, but solenoids are due at higher mileages.
The 2016 MOT report documents above-average frequency of tie rod wear and increased driveshaft wear on the C5 II. Tyre inner edge wear and clunking in corners are typical symptoms.
According to MOT reports, the C5 II frequently shows oil leaks at engine and gearbox seals as well as occasional BSI control unit problems. Faulty EGR valves cause short-circuit risks at the starter cable connection (recall 2013–2017).
