BMW 4 Series 428i Engine Replacement — Compare Prices & Get Quotes
Get quotes today from trusted UK BMW 428i specialists. Compare reconditioned, rebuilt and used 2.0-litre turbocharged petrol engines - N20 and B48 variants across the F32 Coupé, F33 Convertible and F36 Gran Coupé - supply & fit available nationwide.
The 428i THROUGH TIME - Era Map
Four generations. Four eras. One guide to reliability, costs and what really matters.
Era Note
Pre-2015 N20 timing chain guide failure is the critical weakness
Why use this era map?
This table is the single source every other section on this page matches - Sections 2, 4 and 6 reference it rather than restating conflicting figures.
BMW 4 Series 428i Engine Replacement Costs
Figures above reflect current 428i replacement costs. The B48 variant typically sits at the higher end of the range. See the Era Map above for generation-specific pricing.
Labour estimate: Fitting a 428i engine typically takes 10–14 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer).
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4 Series 428i - Repair, Buy, or Replace?
Every 320d has a story. Make the right call with clear data, real-world costs, and honest guidance from UK specialists.
Can It Be Repaired?
Buying This 428i? Check These First
Buy If
- Post-LCI (2017+) with the B48 engine (significantly more reliable)
- Pre-LCI (2013–2017) with documented timing chain guide replacement
- Full service history with regular oil changes (critical for chain longevity)
- No cold-start rattling (listen carefully on first start)
- No oil leaks around the oil filter housing or valve cover
Avoid If
- Pre-LCI N20 with cold-start rattle and no chain history - assume it's overdue
- No service history - the N20 is unforgiving of neglect
- Oil leaks around the oil filter housing (belt damage risk)
- Overheating history or unexplained coolant loss - may indicate water pump or head gasket issues
Closing Verdict
The 428i is BMW's entry-level 2.0-litre turbocharged petrol in the first-generation 4 Series. The N20 (pre-LCI, 2013–2017) is a capable engine let down by one critical design flaw - timing chain guide failure. The B48 (LCI, 2017–2020) is a significant improvement, resolving the chain issues and offering greater reliability. With typical F32/F33/F36 values ranging from £8,000 to £20,000+, a £4,000–£5,500 engine replacement is a significant investment. A post-2017 B48-engined car is the safer choice.
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Buying Checklist
Before you buy a used BMW 4 Series 428i (or before you commit to an engine replacement), check these:
Cold Start
Listen for rattling (N20 timing chain guide warning) - see the map above
Service History
Including which engine era (N20 or B48) and oil-change discipline
Timing Chain
For N20 (pre-LCI): check for any chain work or cold-start rattle
Oil Leaks
Check around valve cover and oil filter housing for leaks
Coolant Level
Check reservoir when cold; any low or loss may indicate water pump issues
Turbo Health
Test acceleration; any lag, whistling, or hesitation?
Engine Warning Light
Have codes been read? Any unresolved issues?
MOT History
Check for emissions-related failures
Buy smart. Drive with confidence.
A few checks today can save thousands tomorrow. Use this checklist to avoid the most common 320d pitfalls.
BMW 320d Engine Codes
This table's rows match Section 1B's Era Map exactly.
N20B20A
Technical Specs
B48B20 - LCI generation→ Compare 428i engine prices for your 4 Series
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Market Intelligence
Most Common Failure
N20 timing chain guide failure (pre-LCI)
the defining issue of the earlier 428i
Average Enquiry Mileage
50,000
–70,000 miles
[PATTERN DATA]
Average Replacement Cost
£4,000
–£5,000 reconditioned, supply only
[PLACEHOLDER]
Most Requested Engine Code
N20B20A
[PATTERN DATA]
Peak Enquiry Season
Winter
cold starts expose timing chain wear
[PATTERN DATA]
Regional Demand
PATTERN DATA
Regional Demand Breakdown
BMW 320d - Frequently Asked Questions
All prices are indicative UK market ranges based on historical quote data from our network of engine specialists. Actual costs vary by variant, engine condition, damage severity and workshop location. Use our free comparison tool to get tailored quotes. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited-mileage warranty - always confirm terms with your chosen supplier.
Why UK BMW 4 Series 428i Owners Trust BMWEngines.uk
Trusted 428i Engine Suppliers
every garage and engine rebuilder in our network is vetted, rated and reviewed by real 4 Series 428i owners, as part of the Engine Finders network, across every generation - N20 and B48 - covering the F32 Coupé, F33 Convertible and F36 Gran Coupé.
Compare 428i Engine Replacement Companies
see prices, warranty terms and supply & fit options side-by-side before you commit. We cover the 2.0-litre turbocharged petrol specifically, with specialists who understand the N20 timing chain vulnerability and the improved B48 design.
UK Engine Replacement Services for 428i
supply-only or full supply & fit available nationwide, covering every generation of this badge since 2013, with a 12-month warranty as standard across our network.
Find the best BMW 4 Series 428i engine replacement UK drivers rely on. Compare prices from trusted specialists on EnginesMarket today and get back on the road with confidence.
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No hidden fees
No Obligation
Get quotes with zero pressure
UK Specialists
20+ vetted experts
12-Month Warranty
As standard
Nationwide Delivery
Supply & fit available