The 2021 Partner III shares PSA Group's EMP2 platform with Citroën Berlingo and Opel Combo. The 1.2 PureTech three-cylinder suffers from wet-belt timing system failures, while the 1.5 BlueHDi diesel sees DPF and injector issues but is mechanically more robust.
1.2 PureTech Wet Timing Belt Failure
Common · high severityTypical onset: 40,000-80,000 mi
Symptoms: Metallic rattling on cold start, Oil contamination with white particles, Check engine light with timing correlation codes, Sudden loss of power or no-start
Fix: The oil-bathed timing belt disintegrates, sending debris through the engine. Requires complete engine teardown, new belt kit, oil pump, sump cleaning, and often camshaft replacement. Belt should be inspected every 30k mi and replaced proactively at 60k. 12-18 labor hours for preventive replacement, 25-35 hours if engine damage occurred.
Estimated cost: $2,800-4,200 preventive, $6,500-9,500 if engine damage
Hydraulic Lifter Collapse on 1.2 PureTech
Occasional · medium severityTypical onset: 50,000-90,000 mi
Symptoms: Loud ticking or tapping at idle, Noise worsens when engine is hot, Hesitation on acceleration, Sometimes triggers misfire codes
Fix: All 12 lifters typically need replacement along with cam followers. Cylinder head removal required for proper access. Often done in conjunction with timing belt service. Oil contamination from belt debris accelerates wear. 8-12 labor hours.
Estimated cost: $1,800-2,800
EAT6 Automatic Transmission Oil Cooler Failure
Occasional · high severityTypical onset: 60,000-100,000 mi
Symptoms: Transmission slipping or delayed engagement, Pink milky fluid in coolant reservoir, Transmission overheating warnings, Harsh shifting when cold
Fix: Internal cooler in the radiator fails, allowing coolant and ATF to mix. Requires new radiator, complete transmission flush with new fluid and filter, sometimes new torque converter if contamination is severe. Transmission mounts often need replacement during this job as they're oil-soaked. 6-9 labor hours.
Estimated cost: $2,200-3,800
1.5 BlueHDi DPF Clogging and Regeneration Issues
Common · medium severityTypical onset: 30,000-70,000 mi
Symptoms: Frequent DPF regeneration cycles, Loss of power and limp mode, Excessive fuel consumption, Warning light showing DPF full, Strong diesel smell during regen
Fix: Short trips and city driving prevent proper regeneration. DPF cleaning with forced regen usually works initially (2 hours), but filter often requires replacement by 80k mi. Pressure sensors fail frequently. Full DPF replacement is 4-6 labor hours.
Estimated cost: $350-650 for cleaning/sensors, $2,500-3,200 for DPF replacement
Fuel Injector Failure on 1.5 BlueHDi
Occasional · medium severityTypical onset: 80,000-120,000 mi
Symptoms: Rough idle and misfires, Black smoke on acceleration, Hard starting when cold, Poor fuel economy, Diesel knock more pronounced
Fix: High-pressure injectors leak or stick. Usually one fails first but others follow within 20k miles. Requires injector coding after replacement. Single injector is 2-3 hours; all four is 5-7 hours. Poor fuel quality accelerates failures.
Estimated cost: $800-1,200 per injector, $2,800-4,000 for all four
Transmission Mount Failure (Both Engines)
Common · low severityTypical onset: 50,000-80,000 mi
Symptoms: Clunking when shifting or accelerating, Excessive engine movement visible from driver seat, Vibration through cabin at idle, Gear lever feels loose
Fix: The upper transmission mount rubber deteriorates, especially on manual transmission models. Automatic EAT6 also sees left-side mount failure. Simple replacement but access is tight on diesel models. 1.5-2.5 labor hours.
Estimated cost: $350-650
Buy the diesel if you do highway miles and can handle DPF maintenance; avoid the 1.2 PureTech unless timing belt has been replaced with proof—it's otherwise a ticking time bomb that can grenade an engine.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.