CAXA 1.4 TSI

Rattle for a second or two on cold start, chain noise from the back of the engine, timing correlation faults, or no start after the car has stood. The early hydraulic tensioner can lose tension and allow the chain to jump. The chain is at the gearbox end of the engine, so access is poor and a failure usually bends valves.

Check: Insist on a stone-cold start and stand at the bulkhead end of the engine. Any rattle beyond the first half-second is this until proven otherwise. Ask for a tensioner receipt with the part number. The revised part is the fix, not the mileage.

Later parts: Revised tensioner part number; fitted from later production

Rattle on start-up, chain noise that grows, timing correlation codes, and in the worst case a jumped chain and bent valves. The EA111 1.4 TSI uses a short chain with a tensioner that can lose tension and allow the chain to skip. VW revised the tensioner.

Check: Cold start and listen at the timing end. Any rattle beyond the first moment is this. Ask for a tensioner receipt with the revised part number.

Later parts: Revised tensioner part number on later production

Rough cold idle, slow throttle response, misfires, gradual loss of low-end response. Direct injection puts no fuel over the intake valves, so crankcase vapour deposits bake on undisturbed.

Check: Not visible without a borescope. Treat it as a service item that's due unless there's a receipt. It's not a fault, it's an unbudgeted maintenance cost.