BMW Z4 sDrive25I Engine Replacement - Rebuilt & Reconditioned Units from £3,000
Compare BMW Z4 sDrive25I replacement engine prices from trusted UK suppliers. Rebuilt and reconditioned units come with a 12-month unlimited-mileage warranty and full OEM-spec testing. Save up to 60% versus a main dealer quote.
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BMW Z4 sDrive25i Specialists
Expert Solutions for Every Z4 sDrive25i - Z4 sDrive18i to Z4 M40i
Need a reliable replacement engine for your BMW Z4 sDrive25i?
Engine Finders specializes in Z4 sDrive25i engines, offering solutions for common B48B20A timing chain wear issues found in models from 2019-2022.
- ✔ Z4 sDrive25i-Specific Engine Types - Addressing timing chain stretch in B48 variants
- ✔ Precision-Tuned for Z4 sDrive25i - Correct ECU calibration for Valvetronic and turbo systems
- ✔ Z4 sDrive25i Pricing Advantage - Save up to £1,200 on timing chain rebuilds with reconditioned units
BMW Z4 sDrive25i Replacement Engines Options - Verified Units (UK Supply)
All engines bench-tested, VAT-inclusive, with 12-month warranty. MoT-compliant. Nationwide delivery. Direct OEM fitment for G29 chassis.
Rebuilt with OEM timing chain kits to solve B48 chain wear.
Factory-level rebuilds addressing turbocharger oil seal issues.
Inspected and restored, resolving Valvetronic actuator failures.
Direct-fit B48B20A units, minimizing downtime after failure.
Cleaned and tested units resolving oil consumption complaints.
Verified mileage G29 units with documented service history.
BMW Z4 sDrive25i Compatible Engine Codes & Average Prices on Rebuilt Units
All engines professionally reconditioned, bench-tested, and supplied with 12-month warranty. Direct OEM fitment. VAT-inclusive. Nationwide UK delivery.
Why Choose Engine Finders for Your BMW Z4 sDrive25i Engine?
Engine Finders connects UK drivers with vetted specialists for reliable, reconditioned BMW Z4 sDrive25i replacement engines. From the N20B20A petrol unit in the E89 (2011-2013) to the later N20B20B and B48B20A variants in the G29, we understand the unique failure points that affect this model. Whether you’re dealing with timing chain stretch in the N20B20A or high-pressure fuel pump issues in the B48B20A, our network ensures you get a tested, warrantied engine tailored to your Z4 sDrive25i.
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✔ Z4 sDrive25i-Specific Timing Chain Solutions
For the N20B20A in the E89 (2011-2013), timing chain tensioner failures (OEM 11317584084) are common due to heat cycling in the roadster layout. We install upgraded tensioners and reinforced guides designed specifically to handle the sDrive25i’s compact engine bay stress patterns, following BMW Service Bulletin SI B11 03 13.
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✔ Turbo Wastegate & Actuator Fixes
The N20B20B in the facelifted E89 (2013-2016) suffers from turbo actuator faults (OEM 11657647292), causing boost lag specific to this Z4 tune. Our rebuilt engines include reconditioned actuators and reinforced wastegate assemblies, preventing repeat failures in your sDrive25i.
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✔ VANOS Calibration for Z4 Roadsters
Unlike the 320i that shares the N20 engine, the Z4 sDrive25i uses unique VANOS camshaft profiles that often cause oil starvation errors. We rebuild with updated VANOS solenoids and recalibrate ECU maps to match the sDrive25i’s roadster-specific tuning.
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✔ B48B20A High-Pressure Fuel Pump Reliability
The G29 Z4 sDrive25i (2019-2020) with B48B20A engines commonly faces high-pressure fuel pump failure. We replace pumps with the revised OEM unit and bench-test under load to ensure consistent fuel delivery tailored to the G29 chassis.
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✔ Cooling System Upgrades for Convertible Layout
The confined engine bay of the Z4 sDrive25i amplifies thermostat and water pump issues in both N20 and B48 engines. Our rebuilt units include reinforced thermostats and upgraded pumps tested for convertible-specific airflow restrictions.
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✔ Injector Replacement & Coding
Direct-injection injectors on the B48B20A in the G29 often misfire under load. We fit reconditioned injectors, re-code them to Z4-specific ECU parameters, and road test every engine for smooth performance in your sDrive25i.
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✔ OEM Fitment with Z4-Specific Warranty
Every reconditioned engine is tailored to the Z4 sDrive25i’s unique chassis demands. We supply with a 12-month UK-wide warranty covering timing chain, turbo, and fuel system components, giving Z4 owners complete confidence unlike generic BMW rebuild services.
Rated 4.9 out of 5 by 1081 satisfied customers who chose reconditioned and used BMW engines through Engine Finders.
Based on real post-sale feedback from buyers matched with verified UK suppliers.
BMW Z4 sDrive25i Engines for Sale | Engine Finders
Need a trusted BMW Z4 sDrive25i replacement engine? Engine Finders helps UK owners source reconditioned N20B20 units, addressing timing chain failures and high-pressure fuel pump issues unique to this model.
BMW Z4 sDrive25i Replacement Engines
The Z4 sDrive25i (E89, produced from 2011-2016) was equipped with the N20B20 2.0L turbocharged inline-4 engine. This generation introduced BMW’s Valvetronic and direct injection, boosting efficiency but also exposing the N20 to timing chain wear and VANOS actuator issues. BMW Service Bulletin SI B11 04 14 addressed premature timing chain guide failures, particularly affecting 2012-2014 production years. Later B48 engines replaced the N20 in successor models, but the sDrive25i remains distinguished by its earlier N20 configuration and specific turbocharger calibration for the F-chassis roadster.
BMW Z4 sDrive25i Models & Engines Codes
The Z4 sDrive25i is built on the E89 chassis and primarily powered by BMW’s N20 petrol engine family. Below are the most relevant engine codes for this variant:
- N20B20A: 2.0L turbo petrol, used in early sDrive25i models (2011-2013), known for timing chain tensioner wear (OEM 11317587758).
- N20B20B: Updated 2.0L turbo petrol (2013-2016), improved chain guides but prone to VANOS solenoid clogging and HPFP issues.
- B48B20A: While not officially part of the E89 sDrive25i, this engine replaced the N20 in successor G29 models, included here for retrofit clarity.
Unlike the 28i variant, the sDrive25i uses a lower-boost calibration of the N20, which altered turbo wear patterns and injector lifespans. These specifics matter when sourcing the correct replacement engine.
Buy Used and Second-Hand BMW Z4 sDrive25i Engines
Z4 sDrive25i owners can choose between used, rebuilt, reconditioned, and remanufactured N20 engines, depending on budget and long-term reliability needs.
- Used: Cost-effective, but history-dependent with no assurance on timing chain wear.
- Rebuilt: OEM parts replaced as needed, suitable for moderate mileage Z4s.
- Reconditioned: Full strip-down, addressing N20-specific weak points like VANOS solenoids.
- Remanufactured: Factory-level rebuild with upgraded timing components for maximum longevity.
For the sDrive25i, remanufactured options are strongly advised due to recurring N20 timing chain issues.
BMW Z4 sDrive25i Engines in Stock
Our reconditioned Z4 sDrive25i engines typically include upgraded timing chain kits and improved lubrication pathways, tailored to address N20-specific weaknesses.
- New timing chain tensioner (OEM 11317587758) to resolve premature wear.
- Refurbished turbocharger unit with recalibrated boost control.
- Cleaned or replaced VANOS solenoids (OEM 11367601979).
- Upgraded high-pressure fuel pump tested under load.
Every engine undergoes compression testing, oil pressure checks, and ECU diagnostics specific to Z4 tuning before being listed as available stock.
Warranty for Replacement BMW Z4 sDrive25i Engines
Engine Finders’ partnered suppliers provide a standard 12-month warranty for rebuilt and reconditioned Z4 sDrive25i engines.
- Coverage includes timing chain components replaced with OEM 11317587758 parts.
- Turbocharger replacements covered against premature bearing wear.
- VANOS and HPFP units protected under standard supplier warranty terms.
Note: Engine Finders operates as a comparison platform. Warranty specifics vary by supplier, particularly for high-mileage N20B20A engines with known chain wear risks.
Expert Tips for Choosing the Right Engine for Your BMW Z4 sDrive25i
BMW Z4 sDrive25i Engine Types Explained
- N20B20A (2011-2013) - prone to timing chain wear
- N20B20B (2013-2016) - improved chain guides, VANOS issues
- Reconditioned units include upgraded chain tensioner 11317587758
- Remanufactured builds resolve turbo wastegate actuator failures
BMW Z4 sDrive25i Replacement Engine Cost in the UK
- Used N20 engines: £1,800-£2,200 depending on mileage
- Reconditioned units: £2,600-£3,000 with timing chain fix
- Remanufactured N20B20B: £3,200-£3,600 fully warrantied
- Engine Finders users save up to 25% on sourcing
Finding the Right BMW Z4 sDrive25i Engine
- Check VIN for N20B20A (early E89, 2011-2013)
- N20B20B used in later Z4 builds from 2013-2016
- Confirm F-chassis mount compatibility before purchase
- Don’t confuse B48 swaps from G29 with E89 fitment
BMW Z4 sDrive25i Petrol vs Diesel Engines
- sDrive25i only offered with N20 petrol turbo engines
- Petrol delivers 245hp with Valvetronic efficiency gains
- No diesel option available for this specific variant
- ULEZ-compliant, avoiding diesel surcharge in London
Quality Assurance & Warranty
- Chain tensioner 11317587758 replaced during rebuilds
- Turbochargers inspected for wastegate wear patterns
- ECU coding checked for correct N20B20 calibration
- 12-month warranty covers VANOS & HPFP replacements
Compare & Save on BMW Z4 sDrive25i Engines
- Compare N20B20A vs N20B20B pricing before buying
- Avoid suppliers who skip VANOS solenoid replacement
- Request proof of upgraded timing kit installation
- Engine Finders secures quotes from verified UK stock
BMW Z4 sDrive25i Engine Works: How Experts Rebuild Engines
When your engine fails, BMW Z4 sDrive25i engine works can restore performance at a fraction of the cost of a brand-new engine. From diagnostics to rebuild, here's how experts ensure optimal results.
Step 1: Full teardown of the N20 block with BMW tool set 119340 to access chain assembly.
Step 2: Inspect chain guides and tensioner 11317587758, replacing if wear exceeds BMW spec.
Step 3: Cylinder head resurfaced, torque set at 25Nm + 90° for bolts per BMW service sheet.
Step 4: VANOS solenoids (11367601979) cleaned or replaced for oil flow stability.
Step 5: Turbocharger rebuilt with recalibrated wastegate actuator, boost tested to spec.
Step 6: ECU reprogramming for N20B20B ensuring correct ignition and fuel pressure mapping.