BMW 3 Series Common Faults & Problems (UK Buyer's Guide)
F30 (2012–2018) & G20 (2019–) · Saloon / Touring
This is an independent guide to the BMW 3 Series, written for used car buyers rather than sellers. The faults below come from owner reports, UK garage patterns and MOT history for this generation — not manufacturer marketing, and we take no commission from any dealer. Use it to spot the expensive problems before you hand over money.
Brilliant to drive — but running costs bite if you don't buy carefully.
Common Faults
Each fault below is drawn from real owner reports and UK garage patterns for this generation — not generic used-car advice.
N47 diesel timing chain (pre-2016)
criticalN47 2.0d timing chain sits at the back of the engine — failure means engine-out repair costing thousands.
Check for: Diesel rattle on start-up. Ask specifically if chain has been done.
Typical cost: £1,800–£3,000
EGR cooler leak (recall)
seriousEGR cooler recall affected many diesel BMWs — check the recall is done or fire risk remains.
Check for: gov.uk/check-vehicle-recall by reg.
Typical cost: Free under recall; £500+ otherwise
Water pump (electric)
moderateElectric water pumps fail around 60–90k miles.
Check for: Overheat warnings, coolant loss.
Typical cost: £450–£700
What to Check Before Buying
Take this list to the viewing. Every point comes straight from the faults above.
- N47 diesel timing chain (pre-2016): Diesel rattle on start-up. Ask specifically if chain has been done.
- EGR cooler leak (recall): gov.uk/check-vehicle-recall by reg.
- Water pump (electric): Overheat warnings, coolant loss.
MOT history red flags
If any of these appear on the last two MOTs, negotiate hard or walk away.
- Emissions failure on diesel
- Any 'suspension bush' advisory — front control arm bushes are consumables
Sharp questions to ask the seller
- N47 diesel: has the timing chain been replaced?
- EGR recall done?
- Full BMW or independent BMW specialist history?
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