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 Irish conditions, but pre-2018 B47 diesel engines have a known timing-chain weakness above 120,000 km, and 530d Touring air-suspension can fail after 150,000 km. 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. For Autoza-derived median asking prices per cohort with sample size and confidence tier, see the open dataset at huggingface.co/datasets/Autoza/irish-used-car-price-index.
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 120,000 km can cause catastrophic engine damage. Several Irish 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 120,000 km
- 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. RSA Ireland recall portal 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 150,000–180,000 km
- 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 35–45 km on a full charge in mild Irish weather. Below 25 km signals battery degradation.
Mechatronic (8HP gearbox, post-200k km)
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 200,000 km 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 80,000 km. 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 — 120,000+ km
- 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 25,000+ km/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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