Cooper / Cooper S (1.6 EP6)
2006–2013 · petrol · 1598cc · 175hp
Engine codes: EP6, N12, N14, N18
Reliability, common problems and owner reviews for the Mini Hatch Cooper / Cooper S (1.6 EP6). Check this before you buy used.
The R56's 1.6 petrols are the BMW/PSA 'Prince' engine (EP6, the same unit as the Peugeot 308/207 THP and Citroën C4) — fun to drive but the R56's Achilles heel: timing-chain stretch and rattle (the defining failure, can destroy the engine if ignored), direct-injection carbon, high-pressure-fuel-pump and (on turbo S/JCW) turbo and the infamous N14 carbon/death-rattle. The naturally-aspirated Cooper is a little less stressed than the supercharged-feel turbo S. Buy only with full chain history and budget for it — an unknown R56 1.6 is one of the riskier used buys in this catalogue.
Known Issues
Chain stretches → cold-start 'death rattle' → can skip and wreck the engine. The defining R56 fault.
Fix / Workaround: Replace chain kit at first rattle; strict oil. Walk away from a rattling car.
Repair cost: €700–€2200
Typically appears after: 70,000 km
DI valve carbon; high-pressure pump and (turbo S) turbo wear.
Fix / Workaround: Walnut-blast intake; replace HPFP/turbo as needed.
Repair cost: €300–€1800
Typically appears after: 90,000 km
Year Cutoffs
Mileage Thresholds
After 120,000 km: Chain attention overdue — verify it's been done.
Pre-Purchase Checklist
- ☐Cold-start rattle = walk away
- ☐Same EP6 as Peugeot/Citroën THP
- ☐Full chain history essential
Frequently asked questions
Is the Mini Hatch Cooper / Cooper S (1.6 EP6) reliable?
Problematic — The R56's 1.6 petrols are the BMW/PSA 'Prince' engine (EP6, the same unit as the Peugeot 308/207 THP and Citroën C4) — fun to drive but the R56's Achilles heel: timing-chain stretch and rattle (the defining failure, can destroy the engine if ignored), direct-injection carbon, high-pressure-fuel-pump and (on turbo S/JCW) turbo and the infamous N14 carbon/death-rattle. The naturally-aspirated Cooper is a little less stressed than the supercharged-feel turbo S. Buy only with full chain history and budget for it — an unknown R56 1.6 is one of the riskier used buys in this catalogue.
What are the common problems and reviews for the Mini Hatch Cooper / Cooper S (1.6 EP6)?
The most commonly reported problems: Timing chain stretch/rattle (EP6), Carbon / HPFP / turbo.
Is a used Mini Hatch Cooper / Cooper S (1.6 EP6) worth buying?
Known design issues and recurring faults that were never fully resolved. Buy only with eyes open.