Citroën C4 Picasso
Mid-range output of the 1.6 HDi with 90–92 hp. Best-selling diesel in many Citroën models. Good compromise between economy and everyday usability.
Base diesel for the van
90 hp in the large C4 Picasso — a bit tight for the heavy van.
Engine Weaknesses 6
The VTG turbocharger's variable vanes seize up due to oil coke deposits. The engine enters limp mode or abruptly loses boost. The cause is almost always spent oil with high soot content after excessively long oil change intervals.
Symptoms: Sudden power drop, limp mode, whistling noise, black smoke, boost pressure fault P0234
Leaking injectors on the 92 hp variant push fuel into the engine oil; the elevated fuel content in the oil significantly accelerates turbo damage. Detection is difficult since the oil level appears to rise due to fuel entry.
Symptoms: Strong fuel smell in oil, rising oil level, blue smoke, turbo noises
The EGR valve on the DV6-92 tends to block with soot, especially on vehicles with frequent short-trip use. A blocked valve triggers limp mode and prevents restarting after a hot engine shut-off.
Symptoms: Engine hard to start or stalls after starting, limp mode, engine warning light P0401
Swirl flaps in the DV6-92 inlet manifold coke up from oil mist in the crankcase breather and recirculated exhaust gases. Broken flap fragments can be drawn into the engine and cause severe damage.
Symptoms: Hesitation at low revs, fault codes P2004/P2006, smoke, power drop
The intake swirl flaps coke up and seize from EGR soot deposits. The actuator motor overloads and fails. Broken flap fragments risk engine damage from foreign body ingestion.
Symptoms: Engine limp mode from actuator overload, swirl flap fault code, power loss especially in the lower rev range, DPF regeneration fails.
The DPF differential pressure sensor fails and reports incorrect values to the ECU. As a result, regeneration triggers too early or not at all, leading to DPF clogging.
Symptoms: Fault message 'exhaust system defective', engine warning light, increased fuel consumption from frequent regeneration cycles, occasional engine limp mode.
Vehicle Weaknesses 4
The optional air suspension on the C4 Picasso I is considered the main weak point. Leaking air bags and failed compressors cause the vehicle to sink on one side. Many owners convert to conventional springs.
From five years on, steering joints, axle springs and dampers show above-average defect rates at the MOT on the C4 Picasso I. Driveshafts are a documented weak point across almost all build years.
The exhaust system on the C4 Picasso I is flagged above average by the MOT for corrosion. Short-trip drivers in particular have problems as the exhaust system does not dry out sufficiently.
The C4 Picasso I shows electrical problems from permanent consumers in the standby current circuit. Vehicles with many extras (seat heating, auxiliary heater) are particularly prone to unexplained battery drain.
