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BMW N55B30A Engine - Replacement Cost, Problems & CompatibilityProblems & Compatibility
The 3.0-litre single-turbocharged inline-six petrol engine fitted to BMW’s 335i, 435i, 535i, X3 xDrive35i, and X5 xDrive35i models. Reconditioned N55B30A units typically start from £3,800 , backed by 540 UK replacement requests in 2025 .
Supply & Fit Available
12-Month Warranty
Nationwide Delivery
100+ Suppliers
Used from
£2,000
Reconditioned from
£3,800
Rebuilt from
£5,000
GB
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Quotes only from vetted UK engine specialists.
Key Specs
BMW N55B30A - Specifications at a Glance
Engine Code
N55B30A
Fuel
Petrol
Configuration
3.0L inline-6, single twin-scroll turbo
Power Output(s)
300hp - 320hp (225kW - 240kW)
Years Produced
2009-2015
UK Models Fitted
6+ BMW models - full list in Compatibility below
2025 UK Replacement Requests
540
Replaced
N54B30
Replaced By
B58B30M0
Most Common Failure
Plastic charge pipe cracking and VANOS solenoid wear
Reconditioned Price Range
£3,800-£6,000 supply-only
Vetted UK specialists for N55B30A replacements
Minimum 12-month warranty on reconditioned and rebuilt options
Fitted To
Which BMW Models Use the N55B30A-
TAG: Fitted To
| Model | Generation/Chassis | Badge(s) | Years | Link |
|---|---|---|---|---|
 BMW 3 Series | F30 | 335i | 2012-2015 | |
 BMW 4 Series | F32 | 435i | 2013-2015 | |
 BMW 5 Series | F10 | 535i | 2010-2015 | |
 BMW X3 | F25 | xDrive35i | 2011-2017 | |
| BMW X5 | F15 | xDrive35i | 2013-2018 | |
| BMW Z4 | E89 | sDrive35i | 2009-2016 |
02
BMW 4 Series
03
BMW 5 Series
04
BMW X3
05
BMW X5
06
BMW Z4
CROSS-BRAND
N55B30A is documented across 6 BMW applications spanning BMW 3 Series, BMW 4 Series, BMW 5 Series, BMW X3, BMW X5, BMW Z4. Registration lookup confirms the exact suffix before quotes are sent.
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Prices
BMW N55B30A Engine Replacement Cost (UK)
Condition | Supply Only | Fitted (Independent Specialist) | Typical Warranty |
|---|---|---|---|
Used | £2,000-£3,800 | £2,650-£4,710 | 3-6 months |
Reconditioned | £3,800-£6,000 | £4,450-£6,910 | 12-24 months |
Rebuilt | £5,000-£8,000 | £5,650-£8,910 | 12-24 months |
The final cost of a BMW N55B30A engine replacement is heavily influenced by the condition of the high-pressure fuel pump (HPFP) and whether the factory plastic charge pipe has been upgraded to aluminium. Units sourced with documented VANOS solenoid replacements and upgraded cooling components command a slight premium but offer significantly lower near-term risk. For a complete breakdown of how these factors impact your final invoice, see our full reconditioned engine cost guide .
Labour Guide
Fitting an N55B30A typically takes 10-14 hours at £65-£85/hr (independent) - confirm exact labour when comparing quotes.
Price Factors
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Common Problems
BMW N55B30A Engine Problems - What Actually Fails
Every engine has its weak points. Here are the known issues with the N55B30A, based on real-world data and verified failure patterns.
Verified issue focus: Plastic charge pipe cracking and VANOS solenoid wear.
1. Plastic Charge Pipe Cracking
1. Plastic Charge Pipe Cracking
Typical onset:
60k-90k miles
What happens:
The factory plastic charge pipe connecting the turbocharger to the throttle body becomes brittle over time due to heat cycling and boost pressure. It frequently cracks or snaps at the flange, resulting in a sudden, loud hissing noise, immediate loss of boost, and the engine entering limp mode.
Repair vs replace:
This is a well-documented, non-catastrophic failure. An upgraded aftermarket aluminium charge pipe is a definitive, cost-effective fix. A full N55B30A engine replacement is only necessary if the sudden boost leak caused secondary turbocharger or engine damage, which is rare.
Read more about this issue
2. VANOS Solenoid Failure
2. VANOS Solenoid Failure
Typical onset:
70k-110k miles
What happens:
The solenoids responsible for controlling BMW’s variable valve timing (VANOS) system can clog with microscopic debris from normal engine wear or fail electrically. This triggers "Drivetrain Malfunction" warnings on the dashboard, rough idling, and a noticeable loss of low-end torque.
Repair vs replace:
VANOS solenoids are relatively inexpensive and straightforward to replace. A full unit replacement is only required if prolonged neglect of VANOS faults led to severe timing chain stretch or camshaft wear.
Read more about this issue
3. Water Pump and High-Pressure Fuel Pump (HPFP) Issues
3. Water Pump and High-Pressure Fuel Pump (HPFP) Issues
Typical onset:
80k-120k miles
What happens:
The N55B30A uses an electric water pump and thermostat housing that are prone to premature failure, often without prior warning. Concurrently, the HPFP can suffer from internal wear, leading to long crank times, rough running, or lean condition fault codes.
Repair vs replace:
Both the water pump and HPFP are considered standard wear items on the N55 platform and are replaced individually. A reconditioned N55B30A is only justified if HPFP failure resulted in catastrophic piston or valve damage due to severe lean running.
Read more about this issue
Post-2012 N55B30A units received revised VANOS solenoids and slightly more robust charge pipe routing. However, the plastic piping material remained a vulnerability until the successor B58 generation introduced aluminium piping and a closed-deck block as standard .
Compare rebuilt N55B30A prices with the failure already addressed
Engine Variants
How to Confirm You Have the N55B30A
The N55B30A engine code is stamped directly onto the engine block, typically visible on a machined pad near the oil filter housing, and is also listed on the vehicle’s VIN plate located under the bonnet. Because the N55 sits between two other famous BMW inline-six generations, it is commonly confused with them. Fitting the wrong revision will lead to ECU incompatibility, incorrect turbo mapping, and mounting point misalignment: - N54B30 : The predecessor twin-turbo engine. Visually similar in displacement but features two smaller turbos and entirely different intake/exhaust plumbing. Not interchangeable with the N55B30A.
Not sure which engine your car has- Enter your registration above - we'll confirm your exact N55B30A fitment before any quotes are sent.
Easily Confused
N54B30
The N54 it replaced featured a complex twin-turbo setup that was prone to high-pressure fuel pump and wastegate failures; the N55B30A simplified this to a single twin-scroll turbo for better low-end response and reliability.
Alternative / Next-Gen Code
B58B30M0
- The B58B30M0 resolved the N55's remaining weaknesses by introducing a closed-deck block, an integrated exhaust manifold, and a much more robust cooling system, making it significantly more reliable for tuned and high-mileage applications.
Related JLR Variants
N55B30O0
If your vehicle is a later or differently calibrated 3.0L turbo petrol (such as certain xDrive models), you may have this variant; it shares the core block but has different ECU mapping and peripheral hardware.
Confirm the exact N55B30A fitment
Not sure which engine your car has- Enter your registration above - we'll confirm your exact N55B30A fitment before any quotes are sent.
Buying Guide
Buying a Replacement N55B30A - What to Choose
Choosing the right replacement route depends on your budget, risk tolerance, and ownership goals. Here's a breakdown of your options.
Used:
A used N55B30A is a viable option only if it comes with documented, timestamped proof of an upgraded aluminium charge pipe, recent VANOS solenoid replacement, and a healthy HPFP. Given the known wear patterns of these components, the risk of hidden cooling or fuel system failures makes an unverified used N55B30A engine a false economy.
Reconditioned:
The recommended choice for most N55B30A owners. A proper reconditioning process addresses the engine's known weak points by installing an upgraded aluminium charge pipe, replacing the VANOS solenoids, and fitting a new electric water pump and thermostat housing. This directly mitigates the N55's failure profile while retaining the original, sound engine block.
Rebuilt:
A full rebuild is justified if the host vehicle is a tuned example or if the engine suffered secondary damage from a failed HPFP or severe overheating due to water pump failure. An upgraded rebuild should include forged internals and revised cooling components to handle increased boost and thermal loads.
Supply & Fit Line:
Booking supply and fit through our network ensures the replacement N55B30A is installed by specialists familiar with BMW's inline-six turbo architecture, backed by a nationwide warranty and post-installation ECU coding and adaptation resets.
Vehicle Value Note:
The N55B30A is typically found in premium BMW models (335i, 435i, 535i, X5 xDrive35i) valued between £6,000 and £18,000 . While replacement is generally viable, older F10 535i or E89 Z4 examples approaching the £6,000 mark should be carefully evaluated. If the lowest viable replacement cost exceeds approximately 60% of the vehicle's current market value, evaluate scrap value before committing.
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Related Engines
Engines Related to the BMW N55B30A
Explore engines that are closely related to the BMW N55B30A, including its predecessor, successor, and key family variants.
Predecessor
N54B30
The N54 it replaced featured a complex twin-turbo setup that was prone to high-pressure fuel pump and wastegate failures; the N55B30A simplified this to a single twin-scroll turbo for better low-end response and reliability.
Successor
B58B30M0
- The B58B30M0 resolved the N55's remaining weaknesses by introducing a closed-deck block, an integrated exhaust manifold, and a much more robust cooling system, making it significantly more reliable for tuned and high-mileage applications.
Sibling
N55B30O0
If your vehicle is a later or differently calibrated 3.0L turbo petrol (such as certain xDrive models), you may have this variant; it shares the core block but has different ECU mapping and peripheral hardware.
FAQ
BMW N55B30AFrequently Asked Questions
Question 1How much does a BMW N55B30A engine replacement cost-
A reconditioned BMW N55B30A engine typically costs between £3,800 and £6,000 for supply only, or £4,450 to £6,910 fully fitted by an independent specialist. Prices vary based on whether the water pump, HPFP, and VANOS components are included in the reconditioning process. Labour typically adds 10-14 hours of workshop time to the final invoice.
- Prices vary based on whether the water pump, HPFP, and VANOS components are included in the reconditioning process.
- Labour typically adds 10-14 hours of workshop time to the final invoice.
Question 2What is the most common BMW N55B30A engine problem-
The most documented failure is the factory plastic charge pipe cracking, typically occurring between 60,000 and 90,000 miles, alongside VANOS solenoid wear. The plastic charge pipe becomes brittle and snaps, causing an immediate loss of boost and limp mode. VANOS solenoid failure triggers Drivetrain Malfunction warnings and a noticeable loss of low-end torque.
- The plastic charge pipe becomes brittle and snaps, causing an immediate loss of boost and limp mode.
- VANOS solenoid failure triggers "Drivetrain Malfunction" warnings and a noticeable loss of low-end torque.
Question 3Which BMW models use the N55B30A engine-
The BMW N55B30A is fitted to performance-oriented models including the 3 Series 335i (F30), 4 Series 435i (F32), 5 Series 535i (F10), X3 xDrive35i (F25), X5 xDrive35i (F15), and Z4 sDrive35i (E89). It was produced from 2009 to 2015 as BMW’s primary single-turbo 3.0-litre inline-six petrol engine. Always verify your exact engine code, as it is commonly confused with the older twin-turbo N54 or the newer B58.
- It was produced from 2009 to 2015 as BMW’s primary single-turbo 3.0-litre inline-six petrol engine.
- Always verify your exact engine code, as it is commonly confused with the older twin-turbo N54 or the newer B58.
Question 4Should I buy a used or reconditioned N55B30A engine-
A reconditioned BMW N55B30A is strongly recommended over a used unit due to the known plastic charge pipe and VANOS failure points. A proper reconditioning process replaces the brittle plastic charge pipe with an upgraded aluminium unit and refreshes the VANOS solenoids and water pump. Used units rarely come with documented proof that these critical preventative repairs have been performed.
- A proper reconditioning process replaces the brittle plastic charge pipe with an upgraded aluminium unit and refreshes the VANOS solenoids and water pump.
- Used units rarely come with documented proof that these critical preventative repairs have been performed.
Question 5How do I confirm my car has the N55B30A engine code-
You can confirm your engine code by checking the VIN plate under the bonnet, reviewing your V5C registration document, or looking for the code stamped on the engine block near the oil filter housing. It is commonly confused with the older N54B30 (twin-turbo) or the newer B58B30M0 (closed-deck). Fitting the wrong revision will lead to ECU incompatibility, incorrect turbo mapping, and mounting point misalignment.
- It is commonly confused with the older N54B30 (twin-turbo) or the newer B58B30M0 (closed-deck).
- Fitting the wrong revision will lead to ECU incompatibility, incorrect turbo mapping, and mounting point misalignment.
Compare BMW N55B30A Engine Prices Today
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Vetted UK specialists for N55B30A replacements
Minimum 12-Month Warranty
Minimum 12-month warranty on reconditioned and rebuilt options
Nationwide Delivery
Nationwide delivery plus supply and fit availability
Expert Support
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