BMW 5 Series Common Faults in the UK
G30, 2017–2024 — premium executive saloon. Updated 2026-05-04.
The G30 BMW 5 Series (2017–2024) is generally robust in UK conditions, but pre-2018 B47 diesel engines have a known timing-chain weakness above 75,000 miles, and 530d Touring air-suspension can fail after 95,000 miles. Post-2019 examples avoid both issues. Best-buy years: 2019–2021. Worst: pre-2018 diesel.
Quick-stats values are indicative editorial estimates aggregated from owner-forum sentiment, recall portals, and reliability surveys. They are not Autoza-derived medians — we do not publish a UK price index yet, and no figure on this page should be quoted as one. See our research methodology for the sample sizes any future published median will have to meet.
Best and worst years to buy
Updated B47 timing chain assembly, refreshed iDrive 7 software, and the EGR cooler recall having been completed. The 2019 LCI brought minor design tweaks but bigger reliability gains under the bonnet.
Pre-2018 B47 diesel timing chains are the headline issue — chain stretch above 75,000 miles can cause catastrophic engine damage. Several UK dealers refuse to take pre-2018 520d in part-exchange for this reason.
Known faults — BMW 5 Series G30, 2017–2024
Documented from HonestJohn, owner forum sentiment (PistonHeads, Reddit), DVSA recall portal, and Autoza dealer-feedback aggregation. Severity is colour-coded.
Engine — B47 diesel timing chain
Critical — engine-out potential- Symptoms
- Rattle on cold start that fades after 5–10 seconds; metallic chain noise when accelerating
- Years affected
- Pre-2018 (B47 engine code, mostly 520d / 525d) — Above 75,000 miles
- Indicative repair (UK)
- £2,500–£4,500 (chain, guides, tensioner, gaskets, labour)
- What to check before buying
- Cold-start in person — never accept "the engine is already warm". Borescope inspection at a BMW specialist (£80–£120) is the cheapest insurance.
EGR cooler (B47 diesel)
Major — significant repair cost- Symptoms
- Coolant loss with no visible external leak; in worst cases, EGR cooler fire (recall issued)
- Years affected
- 2014–2018
- Indicative repair (UK)
- Free under recall if not yet completed; otherwise £1,200–£1,800
- What to check before buying
- Ask the dealer for proof the EGR cooler recall was completed. Recall reference: 0036530100. The gov.uk recall checker can verify by VIN.
Air suspension (530d Touring, 540i Touring)
Moderate — service-level fix- Symptoms
- Car sits low at one corner overnight; harsh ride; air-pump runs constantly
- Years affected
- All years on Touring with optional air suspension — Typical failure 95,000–110,000 miles
- Indicative repair (UK)
- £800–£1,400 per corner (genuine BMW); aftermarket from £350
- What to check before buying
- Park overnight before viewing — check ride height all four corners next morning. Listen for the air pump cycling at idle.
iDrive eDrive battery (530e PHEV)
Moderate — service-level fix- Symptoms
- Reduced electric-only range; longer charging time; loss of full hybrid mode
- Years affected
- 530e PHEV, all years — After year 5, especially below 30°C usage patterns
- Indicative repair (UK)
- £3,500–£6,000 for replacement battery pack
- What to check before buying
- Ask for current EV-only range during test drive. Should achieve 22–28 miles on a full charge in mild UK weather. Below 16 miles signals battery degradation.
Mechatronic (8HP gearbox, post-125,000 miles)
Major — significant repair cost- Symptoms
- Harsh shifts from 2nd to 3rd; check-engine light with transmission codes
- Years affected
- All years, mileage-dependent — Typical issue beyond 125,000 miles without fluid changes
- Indicative repair (UK)
- £1,500–£2,800 for mechatronic rebuild; full ZF service £450–£650
- What to check before buying
- Service history must show ZF 8HP transmission fluid + filter change every 50,000 miles. BMW says "lifetime fluid" — independent specialists strongly disagree.
Front lower control-arm bushings
Minor — wear-and-tear- Symptoms
- Knocking over speed bumps; vague steering; uneven tyre wear on inner edges
- Years affected
- All years — 75,000+ miles
- Indicative repair (UK)
- £280–£450 both sides
- What to check before buying
- Drive over a speed bump slowly during test drive. Listen for clunks. Check inner edge tyre wear.
Sunroof drains (panoramic)
Moderate — service-level fix- Symptoms
- Damp footwells after rain; mouldy smell; water ingress in headlining
- Years affected
- All G30 with panoramic roof
- Indicative repair (UK)
- £150–£400 for drain unblocking; £1,800+ if headlining damaged
- What to check before buying
- Lift carpet at footwells, check for damp. Smell test on a humid day. Look for water staining around A-pillar headliner.
Who this car suits — and who should look elsewhere
Long-distance commuters, motorway drivers, anyone covering 15,000+ miles/year. Excellent depreciation curve from 4 years onwards.
Short-trip city driving (DPF issues), drivers who skip routine servicing, anyone unwilling to budget £700–£1,000/year for maintenance.
Alternatives to consider
If the BMW 5 Series doesn't suit, these comparable models are worth a look in the UK market:
- →Mercedes E-Class W213
- →Audi A6 C8
- →Volvo S90
Looking to buy a BMW 5 Series in the UK?
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