What the known faults on this BMW 4 Series typically cost to put right at a UK independent garage · use the figures to price risk before you bid, and to justify a reduction when something shows up on inspection.
The single priciest documented job on the 2014–2025 BMW 4 Series is head gasket / cooling system repair at £900–£2,600. Few cars need every repair listed here · treat £2,660–£10,200 as the full exposure if one arrived with all of them.
Coolant loss and overheating due to a failing expansion tank or water pump on B-series engines.
Inspect · Shine a torch down the front of the engine block and around the expansion tank seams to check for dried, chalky white coolant residue.
Hesitation, shunting, or juddering under moderate acceleration or cornering due to transfer case wear.
Inspect · Perform a tight figure-of-eight manoeuvre at low speed on full lock. Feel for any skipping, binding, or juddering through the seat and steering wheel.
EGR cooler recall and DPF blockage on diesels
Inspect · Confirm the recall against the VIN and run the car up to temperature
Bush and drop link wear plus kerbed alloys
Inspect · Listen for knocks and inspect all four wheels
Clunking or knocking noise from the front end caused by wear in the EPS steering rack thrust piece.
Inspect · With the engine switched off, rapidly rock the steering wheel left and right by a few degrees. Listen for a distinct metallic clunk from the rack.
Convertible roof mechanism and hydraulic faults
Inspect · Cycle the roof fully twice and check for damp in the boot
iDrive, camera and comfort access faults
Inspect · Test iDrive, cameras and keyless entry
Oil leaking from the oil filter housing gasket (OFHG), which can drip onto the auxiliary belt and cause catastrophic engine failure if ingested.
Inspect · Run a clean white tissue under the lip of the oil filter housing. Inspect the serpentine belt for any signs of oil contamination or fraying.
Ranges are indicative parts-and-labour costs at a UK independent garage, inclusive of VAT. Franchised dealers typically sit 40–80% higher, and prestige or electrified variants sit at the top of each band. Always get a written quote before committing.
Build a tickable checklist for the exact car in front of you, record faults with photos, and hand the buyer a report.