Exhaust manifolds and pre-cats
£1,700–£6,000
typical cost
The F136 family cracks manifolds. Thin-wall sections next to the pre-catalysts fail under heat cycling, and a failed pre-cat can shed material back into the engine, which turns a large bill into a catastrophic one. The tell is a leak noise on cold start that quietens as things expand.
This car
Nothing in five years of invoices mentions manifolds, pre-cats or downpipes. That is not evidence they have failed - it is evidence nobody has looked.
Usually bites: Driven by heat cycling rather than mileage, so a low-mileage car that has done many short trips is not automatically safer.
Verified against 3 published sources.