Is it worth replacing the engine in a BMW 4 Series 435i-

A 2013-2016 BMW 435i is typically worth £8,000-£22,000 depending on condition and mileage. If your car is worth over £10,000, a reconditioned or rebuilt engine with warranty is a sound investment - especially if you plan to keep the car for 2+ years. For lower-value examples, a used engine may be more cost-effective.

How long does a BMW 4 Series 435i engine replacement take-

Supply-only engines are typically dispatched within 1-2 working days. Full supply & fit through a specialist workshop usually takes 2-3 days, depending on workshop availability and the complexity of the specific 435i variant (xDrive models may take slightly longer).

What's the difference between the BMW 435i and 440i engine-

The 435i uses the N55 3.0-litre inline-six turbo (306hp). The 440i uses the newer B58 3.0-litre inline-six turbo (326hp) which replaced the N55 in 2016 as part of the LCI update. The B58 is generally considered more reliable and more powerful, with fewer known issues.

Can I replace my N55 engine with a B58 in my BMW 435i-

While both are 3.0-litre inline-six engines, the B58 is not a direct bolt-in replacement for the N55. It requires different engine mounts, wiring looms, ECUs, and cooling systems. It is not a cost-effective or practical swap. Stick with an N55 replacement for your 435i.

BMW 435i SPECIALISTS

BMW 4 Series 435i Engine Replacement Compare Prices & Get Quotes

Need a replacement engine for your BMW 4 Series 435i- Get quotes today from trusted UK BMW 435i engine specialists and compare prices on reconditioned, rebuilt and used engines for your 435i Coupe, Gran Coupe or Convertible.

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BMW 4 Series 435i Engine

from£2,500 to £7,500

Usedfrom £2,500
Reconditionedfrom £4,500
Common codesN55B30A, N55B30M0

BMW 4-seriesUsed Engine — N55B30A

BMW 4-series 435i Reconditioned Engine — N55B30A

BMW 4-seriesReconditioned Engine — N55B30A

BMW 4-series 435i Rebuilt Engine — N55B30A

BMW 4-seriesRebuilt Engine — N55B30A

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How it works

3 Simple Steps to Finding the Right Replacement Engine

Clear information first, then the right engine and specialist for your exact vehicle.

Variant History

BMW 4 Series 435i Engine History & Specs at a Glance

The BMW 435i joined the 4 Series range at launch in 2013 as the range-topping petrol model, offering a smooth and powerful inline-six turbocharged experience. The 435i was powered exclusively by BMW's N55 engine throughout its production run, delivering 306hp and 400Nm of torque.

2013
N55B30A, 3.0-litre turbocharged inline-six, 306hp - original 435i engine for F32/F33/F36 chassis
2014
N55B30M0, 3.0-litre turbocharged inline-six, 306hp - revised variant with updated engine management calibration
2016
Production of the 435i ends, replaced by the 440i with the B58 engine as part of the Life Cycle Impulse (LCI) update

Every engine fitted to the BMW 4 Series 435i is covered below, with UK rebuilt pricing and known failure points.

Engine Codes & Pricing

BMW 4 Series 435i Engine Codes Specifications & Replacement Cost

Find your exact engine code, specs and UK replacement cost guide.

N55B30A — 3.0L Petrol (2013-2014)

Power Output: 306hp (225kW) @ 5,800rpm
Years Fitted: 2013-2014

Can’t find your exact engine code?-> Get quotes for N55B30A BMW 4 Series 435i engine replacement

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Common failure points and repair options

Charge Pipe Cracking

Affected: BMW 4 Series 435i (N55B30A / N55B30M0, 2013-2016)
Typical failure mileage: 60k-100k

Root cause

The factory charge pipe is made of plastic which becomes brittle and weak after repeated heat cycles, eventually cracking under boost pressure. This causes boost leaks, loss of power, and can trigger the engine management light.

Repair options

Repair tier	Dealer price	Specialist price
Charge pipe replacement (OEM plastic)	£400-£700	£300-£500
Charge pipe replacement (upgraded aluminium)	£500-£800	£400-£600
Full Replacement - rebuilt/reconditioned engine	£6,000-£10,000	£6,000-£9,000

Our recommendation

If you're experiencing loss of power or a check engine light, have the charge pipe inspected immediately. Upgrading to an aluminium charge pipe is a cost-effective preventative measure that eliminates the known weak point.

-> Compare rebuilt N55B30A BMW 4 Series 435i engine prices

Water Pump Failure

Affected: BMW 4 Series 435i (N55B30A / N55B30M0, 2013-2016)
Typical failure mileage: 60k-100k

Root cause

The N55 uses an electric water pump that can fail without warning, causing the engine to overheat and enter limp mode.

Repair options

Repair tier	Dealer price	Specialist price
Water pump replacement	£800-£1,200	£500-£900
Full Replacement - rebuilt/reconditioned engine	£6,000-£10,000	£6,000-£9,000

Our recommendation

Replace the water pump proactively at around 60,000 miles - it's far cheaper than dealing with the consequences of an overheat. Always use genuine or OEM-spec parts.

-> Compare rebuilt N55B30M0 BMW 4 Series 435i engine prices

Don't Let Engine Failure Write Off Your BMW 4 Series 435i

The N55 is a generally robust engine, but its known weak points - charge pipe, water pump, and oil leaks - can escalate quickly if ignored. A rebuilt engine through EnginesMarket comes with upgraded components addressing these failure points, a minimum 12-month warranty, and nationwide delivery or supply & fit options - often at a fraction of main dealer prices.

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FAQ

BMW 4 Series 435i Engine ReplacementFrequently Asked Questions

Everything BMW 4 Series 435i owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

A replacement engine for a BMW 435i typically costs between £2,500 and £9,000 depending on condition. Used N55B30A units start from around £2,500, while reconditioned units range from £4,500 to £7,000. Rebuilt engines with warranty sit at £6,000-£9,000. Specialist fitting adds approximately £780-£1,040 in labour.

Used: £2,500-£4,500
Reconditioned: £4,500-£7,000
Rebuilt: £6,000-£9,000

-> Get a precise quote for your BMW 435i

The N55 engine in the 435i has several well-documented issues. The most common are charge pipe cracking (plastic pipe becomes brittle), electric water pump failure, oil leaks from the valve cover and oil filter housing gaskets, and VANOS solenoid issues. Carbon buildup on intake valves is also common due to the direct injection system.

Charge pipe: upgrade to aluminium for a permanent fix
Water pump: replace proactively at 60k miles
Oil leaks: replace gaskets promptly

-> Check your 435i's engine health

Why Choose Us

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Comparing quotes for your BMW 4 Series 435i engine replacement is completely free and carries no obligation. Enter your registration above to get matched with vetted UK specialists who stock the exact engine for your 435i - whether you need used, reconditioned or rebuilt, with supply-only or full fitment options.

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