1.4 TSI Twincharger 140hp (BMY)
2006–2008 · petrol · 1390cc · 140hp
Engine codes: BMY, CAVA, CAVB, CTHD
Reliability, common problems and owner reviews for the Volkswagen Golf V 1.4 TSI Twincharger 140hp (BMY). Check this before you buy used.
The 1.4 TSI Twincharger (supercharger + turbo, EA111) makes a heavy MPV feel brisk on little fuel — but it's one of VAG's riskier petrols. The timing-chain tensioner can fail and let the chain jump (catastrophic, bent valves), early pistons/rings could crack causing heavy oil consumption and misfires, and the supercharger clutch and HP pump add cost. A well-sorted, documented car with the revised chain tensioner can be fine, but an unknown-history one is a real gamble — many buyers prefer the simpler engines.
Same engine, other cars
This is the same physical engine (BMY) sold under different names across brands. Reliability is broadly shared — cross-check these:
Known Issues
The chain stretches and the tensioner wears. If the chain jumps, valves hit pistons. Telltale is a rattle on cold start. Mk5-era units have the original weaker tensioner.
Fix / Workaround: Replace chain + tensioner + sprockets proactively with the latest-spec parts. Big job (7+ hours).
Repair cost: €500–€1100
Typically appears after: 90,000 km
Supercharger clutch, diverter and the dual-boost plumbing add failure points and repair cost vs a simple engine.
Fix / Workaround: Diagnose boost faults early; budget for higher repair bills.
Repair cost: €200–€1000
Early tensioner can fail → chain jumps → bent valves / wrecked engine.
Fix / Workaround: Confirm revised tensioner fitted; replace chain kit proactively; listen for rattle.
Repair cost: €600–€2500
Typically appears after: 100,000 km
Early pistons/rings could crack → heavy oil consumption, misfires, smoke.
Fix / Workaround: Compression test; revised pistons in repair; check oil use.
Repair cost: €800–€3000
Typically appears after: 90,000 km
Supercharger clutch and high-pressure pump add failure points/cost.
Fix / Workaround: Diagnose boost faults; replace components.
Repair cost: €300–€1200
Year Cutoffs
Mileage Thresholds
After 90,000 km: Timing chain rattle / stretch risk rises sharply.
After 100,000 km: Chain + piston risk window.
Pre-Purchase Checklist
- ☐Cold-start: any rattle = walk away or budget a full chain job
- ☐Ask if the timing chain/tensioner has been replaced and with what spec
- ☐Check for boost-related fault codes
- ☐Prefer a documented chain-replaced car
- ☐Listen for chain rattle; confirm revised tensioner
- ☐Compression test + oil-consumption check
- ☐Documented history essential — or pick a simpler engine
Frequently asked questions
Is the Volkswagen Golf V 1.4 TSI Twincharger 140hp (BMY) reliable?
Problematic — The 1.4 TSI Twincharger (supercharger + turbo, EA111) makes a heavy MPV feel brisk on little fuel — but it's one of VAG's riskier petrols. The timing-chain tensioner can fail and let the chain jump (catastrophic, bent valves), early pistons/rings could crack causing heavy oil consumption and misfires, and the supercharger clutch and HP pump add cost. A well-sorted, documented car with the revised chain tensioner can be fine, but an unknown-history one is a real gamble — many buyers prefer the simpler engines.
What are the common problems and reviews for the Volkswagen Golf V 1.4 TSI Twincharger 140hp (BMY)?
The most commonly reported problems: Timing chain stretch / tensioner failure, Supercharger / twincharge complexity, Timing-chain tensioner failure, Piston / ring failure (oil use), Supercharger clutch / HP pump.
Is a used Volkswagen Golf V 1.4 TSI Twincharger 140hp (BMY) worth buying?
Known design issues and recurring faults that were never fully resolved. Buy only with eyes open.