1.2 PureTech Wet Timing Belt Degradation and Oil Strainer Clogging
SeriousEngineThe 1.2 PureTech three-cylinder petrol engine employs a timing belt running submerged in engine oil ('wet belt'). Heat cycling, fuel dilution from short journeys, and incorrect engine oil cause the belt's rubber compound to crack and shed fibrous debris into the oil sump. This debris clogs the oil pump pickup strainer screen, causing severe oil starvation, loss of brake vacuum assistance (due to vacuum pump oil starvation), oil pressure warning lights, and potential catastrophic engine failure.
Low oil pressure warning lamp flashing on dashboard under braking or cornering, Brake pedal feeling hard or stiff due to brake vacuum pump oil starvation, Engine rattling or noisy valvetrain due to degraded oil circulation, Visible surface cracking, swelling, or edge fraying on timing belt seen through oil filler
- Remove engine oil filler cap and shine a torch inside to inspect timing belt surface for cracks, fraying, or width swelling
- Verify full dealer or specialist service history confirming PSA B71 2312 or B71 2010 oil specification
- Check whether the timing belt has been renewed within the revised 6-year/60,000-mile maintenance schedule