Engines Market

BMW X4 xDRIVE20i SPECIALISTS

BMW X4 xDrive20i Engine Replacement Compare Prices & Get Quotes

Get quotes today from trusted UK BMW X4 xDrive20i engine specialists. Compare prices on reconditioned, rebuilt and used engines - supply & fit available across the full F26 and G02 xDrive20i range.

Supply & Fit Available
12-Month Warranty
Nationwide Delivery
100+ Suppliers
BMW X4 xDrive20i Engine
from£2,200 to £4,200
  • Usedfrom £1,500
  • Reconditionedfrom £2,200
  • Common codesN20B20 (F26), B48B20 (G02)
BMW x4 xDrive20i Used Engine — N20B20BMW x4Used Engine — N20B20BMW x4 xDrive20i Reconditioned Engine — N20B20BMW x4Reconditioned Engine — N20B20BMW x4 xDrive20i Rebuilt Engine — N20B20BMW x4Rebuilt Engine — N20B20

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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 X4 xDrive20i Engine History & Specs at a Glance

The BMW X4 xDrive20i arrived as the entry-level petrol variant in the first-generation F26 X4 range, offering a turbocharged 2.0-litre four-cylinder with xDrive all-wheel drive. The second-generation G02 model replaced the N20 engine with the improved B48 unit.

BMW X4 xDrive20i
  1. 2014

    N20B20, 2.0L turbo petrol, 184hp, F26 generation launch

  2. 2018

    B48B20, 2.0L turbo petrol, 184hp, G02 generation launch

  3. 2021

    B48B20 with 48V mild hybrid, 184hp + 11hp electric boost, G02 LCI facelift

  4. 2025

    End of X4 production; G02 xDrive20i remains available until model run-out

Every engine fitted to the BMW X4 xDrive20i is covered below, with UK rebuilt pricing, known failure points, and compatibility notes for F26 and G02 generations.

Engine Codes & Pricing

BMW X4 xDrive20i Engine Codes Specifications & Replacement Cost

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

N20B20 — 2.0L Turbo Petrol (2014-2018) engine

N20B20 — 2.0L Turbo Petrol (2014-2018)

Power Output
184hp
Years Fitted
2014-2018 (F26 first generation)

Can’t find your exact engine code?-> Get quotes for N20B20 BMW X4 xDrive20i engine replacement

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Common Problems

BMW X4 xDrive20i Engine Problems Repair Cost vs Replacement

The BMW X4 xDrive20i's petrol engine story is one of two generations. Early F26 models with the N20B20 have a well-documented reputation for timing chain failures that can lead to catastrophic engine damage. Later G02 models with the B48B20 are significantly more reliable but introduced their own issues around coolant loss, PCV valve failure, and - on LCI models - mild hybrid system complexity. Every rebuilt engine supplied through EnginesMarket includes upgraded components designed to address the original failure point, plus a minimum 12-month unlimited mileage warranty. Below, we break down the most common X4 xDrive20i engine failures and help you decide whether repair or replacement delivers the best value.

Common failure points and repair options

BMW X4 xDrive20i N20 Timing Chain Failure

Affected
BMW X4 xDrive20i (F26, N20B20, 2014-2018)
Typical failure mileage
50,000-100,000 miles
Root cause
The N20 engine's timing chain is positioned at the rear (flywheel side) of the engine. Chain stretch and guide deterioration cause slack, leading to rattling noises and eventual chain failure. When the chain snaps or jumps teeth, valves collide with pistons - requiring a full engine replacement.

Repair options

Repair tierDealer priceSpecialist price
Preventative Timing Chain Replacement - catch it early£1,800-£2,500£1,200-£1,800
Full Replacement - rebuilt engine£7,000-£10,000£3,200-£5,000
Our recommendation
If you hear a rattling noise from the rear of the engine on cold starts, act immediately. Preventative timing chain replacement at a specialist costs £1,200-£1,800 and saves the engine. Once the chain fails, replacement is the only option - a rebuilt engine from a specialist is dramatically cheaper than a dealer-fit new unit.
-> Compare rebuilt N20B20 BMW X4 xDrive20i engine prices

BMW X4 xDrive20i B48 Coolant Loss & PCV Valve Failure

Affected
BMW X4 xDrive20i (G02, B48B20, 2018-2025)
Typical failure mileage
40,000-80,000 miles (coolant), 50,000-80,000 miles (PCV)
Root cause
The B48 engine has two well-documented issues. First, the coolant expansion tank cap can fail, allowing pressure loss and gradual coolant consumption. Second, the PCV valve is integrated into the plastic valve cover - when the diaphragm fails, it causes whistling noises, oil consumption, and can pressurise the crankcase.

Repair options

Repair tierDealer priceSpecialist price
Coolant Cap Replacement£50-£80£25-£40
Valve Cover & PCV Assembly Replacement£900-£1,400£550-£850
Full Replacement - rebuilt engine£7,500-£10,000£3,200-£5,000
Our recommendation
B48 engines are generally robust, but coolant consumption should never be ignored. Replace the expansion tank cap as a first step (£25-£40). If you hear a whistling sound from the engine bay, the PCV diaphragm has likely failed - on B48 engines, this means replacing the entire valve cover assembly. Use a specialist (£550-£850) rather than a dealer (£900-£1,400).
-> Compare rebuilt B48B20 BMW X4 xDrive20i engine prices

BMW X4 xDrive20i B48 Mild Hybrid System Issues

Affected
BMW X4 xDrive20i (G02 LCI, B48B20 48V, 2021-2025)
Typical failure mileage
40,000-70,000 miles (48V system)
Root cause
The 48V mild hybrid system adds complexity - the belt-driven starter-generator, 48V lithium-ion battery, and cooling system can all develop issues. Component failure can trigger warning lights, reduced power, and in some cases prevent starting.

Repair options

Repair tierDealer priceSpecialist price
48V System Diagnostics£150-£300£80-£150
Starter-Generator Replacement£1,500-£2,500£900-£1,500
Full Replacement - rebuilt engine£8,000-£12,000£3,800-£6,000
Our recommendation
Mild hybrid systems require specialist handling - only garages with BMW-specific diagnostic equipment and 48V training should work on these vehicles. Most engine replacements on LCI cars will be preventative rather than catastrophic. Ensure any replacement includes 48V system isolation and recalibration.
-> Compare rebuilt B48B20 MHEV BMW X4 xDrive20i engine prices

Don't Let Engine Failure Write Off Your BMW X4 xDrive20i

"All prices are indicative UK market ranges based on historical quote data and repair requests from our network of engine specialists. Dealer pricing is estimated based on published main dealer labour rates and genuine OEM parts pricing. Specialist pricing reflects actual quote data from EnginesMarket's UK network. Actual costs vary depending on damage severity, vehicle condition, variant, and workshop location within the UK. Use our free comparison tool to get tailored quotes for your specific BMW X4 xDrive20i. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier."

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FAQ

BMW X4 xDrive20i Engine ReplacementFrequently Asked Questions

Everything BMW X4 xDrive20i owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

Why Choose Us

Compare BMW X4 xDrive20i Engine Prices Today

Comparing quotes for your BMW X4 xDrive20i engine replacement is completely free and carries no obligation. Simply enter your registration, choose from vetted UK specialists, and get back on the road with the confidence of a 12-month unlimited mileage warranty. Whether you need an N20B20 for your F26 or a B48B20 for your G02, our network has the right engine at the right price.

100+100+ BMW X4 xDrive20i engines supplied through our network
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