1.6 THP / VTi (EP6)
2010–2018 · petrol · 1598cc · 156hp
Engine codes: 5FS, 5FV, 5G, EP6, EP6CDT, EP6DT
Reliability, common problems and owner reviews for the Peugeot 508 1.6 THP / VTi (EP6). Check this before you buy used.
The 1.6 THP/VTi (the PSA-BMW 'Prince' EP6, shared with MINI/Peugeot/Citroën) is punchy and economical but one of the era's more troublesome petrols: timing-chain stretch/rattle (and tensioner failure), heavy carbon build-up on the direct-injection intake valves, and on the turbo THP the high-pressure pump and oil consumption. The naturally-aspirated VTi is a bit less stressed but still carbons up. A documented car with chain done and decarbon history can be fine; an unknown-history THP is a real gamble.
Same engine, other cars
This is the same physical engine (5FS) sold under different names across brands. Reliability is broadly shared — cross-check these:
Known Issues
EP6 chain stretches and tensioner can fail → rattle, then jump and valve damage.
Fix / Workaround: Cold-start rattle check; replace chain + tensioner; strict oil.
Repair cost: €600–€1800
Typically appears after: 90,000 km
Heavy carbon on intake valves → misfires, rough running.
Fix / Workaround: Walnut-blast intake; spirited run.
Repair cost: €250–€600
Typically appears after: 80,000 km
Turbo THP HP pump and oil consumption.
Fix / Workaround: Monitor oil; replace HP pump.
Repair cost: €200–€900
Typically appears after: 100,000 km
DI intake-valve carbon; HP pump and oil consumption.
Fix / Workaround: Walnut-blast intake; monitor oil; replace HP pump.
Repair cost: €250–€900
Typically appears after: 80,000 km
Chain stretches → rattle on cold start → can skip. Common EP6 failure.
Fix / Workaround: Replace chain kit at first rattle; strict oil.
Repair cost: €600–€1800
Typically appears after: 90,000 km
DI valve carbon; high-pressure pump and turbo wear.
Fix / Workaround: Walnut-blast intake; replace HPFP/turbo as needed.
Repair cost: €300–€1600
Typically appears after: 100,000 km
Mileage Thresholds
After 100,000 km: Chain + carbon risk window.
After 120,000 km: Chain + carbon attention overdue.
Pre-Purchase Checklist
- ☐Cold-start chain rattle — high priority
- ☐Decarbon / carbon-symptom history
- ☐Diesels are the smarter choice
- ☐Oil-consumption check (THP)
- ☐Decarbon history
- ☐Cold-start chain rattle = walk away
- ☐Same EP6 as 308 / Mini
- ☐Full oil + chain history essential
Frequently asked questions
Is the Peugeot 508 1.6 THP / VTi (EP6) reliable?
Problematic — The 1.6 THP/VTi (the PSA-BMW 'Prince' EP6, shared with MINI/Peugeot/Citroën) is punchy and economical but one of the era's more troublesome petrols: timing-chain stretch/rattle (and tensioner failure), heavy carbon build-up on the direct-injection intake valves, and on the turbo THP the high-pressure pump and oil consumption. The naturally-aspirated VTi is a bit less stressed but still carbons up. A documented car with chain done and decarbon history can be fine; an unknown-history THP is a real gamble.
What are the common problems and reviews for the Peugeot 508 1.6 THP / VTi (EP6)?
The most commonly reported problems: Timing chain stretch / tensioner, Intake-valve carbon (DI), HP pump / oil use (THP), Intake carbon / HP pump, Timing chain stretch (EP6), Intake carbon / HPFP / turbo.
Is a used Peugeot 508 1.6 THP / VTi (EP6) worth buying?
Known design issues and recurring faults that were never fully resolved. Buy only with eyes open.