How much does a BMW 1 Series 128ti engine replacement cost-

A BMW 1 Series 128ti engine replacement typically costs £1,595-£3,500 for a reconditioned or rebuilt B48A20T1 unit supply-only. With supply and fit, expect £2,800-£4,500 depending on the specialist and location.

How long does a BMW 1 Series 128ti engine replacement take-

A BMW 1 Series 128ti engine replacement typically takes 2-3 days for a specialist to complete, including removal of the old B48 unit and fitting the replacement.

BMW 128ti SPECIALISTS

BMW 1 Series 128ti Engine Replacement Compare Prices & Get Quotes

Get quotes today from trusted UK BMW 1 Series 128ti engine specialists. Compare prices on reconditioned, rebuilt and used engines for your BMW 128ti - the 265 hp front-wheel-drive hot hatch that revived the legendary 'ti' badge. Covering the B48A20T1 engine across the F40 generation from 2020 to 2024.

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BMW 1 Series 128ti Engine

from£1,595 to £3,500

Usedfrom £1,295
Reconditionedfrom £1,595
Common codesB48A20T1

BMW 1-series 128ti Used Engine — B48A20T1

BMW 1-seriesUsed Engine — B48A20T1

BMW 1-series 128ti Reconditioned Engine — B48A20T1

BMW 1-seriesReconditioned Engine — B48A20T1

BMW 1-series 128ti Rebuilt Engine — B48A20T1

BMW 1-seriesRebuilt Engine — B48A20T1

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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 1 Series 128ti Engine History & Specs at a Glance

The BMW 128ti was launched in late 2020 as the first front-wheel-drive hot hatch from BMW since the 1990s 3 Series Compact. Reviving the legendary 'ti' (Turismo Internazionale) badge, the 128ti was positioned as a more accessible performance alternative to the all-wheel-drive M135i xDrive. It uses BMW's most powerful four-cylinder engine ever - a 2.0-litre turbocharged B48 producing 265 hp, sent to the front wheels via an eight-speed automatic gearbox with a Torsen limited-slip differential. Production ran from 2020 to 2024 across the F40 generation, before the 1 Series moved to the F70 generation.

Late 2020 - B48A20T1, 2.0L turbocharged petrol, 265 hp (195 kW), launched as a standalone model in the F40 1 Series range
2021
128ti continues production; 'ti' decals, 18-inch wheels and passive sports suspension are standard
2022
Minor updates; 128ti remains the front-wheel-drive performance flagship
2023
Final year of production for the F40 generation 128ti
2024
F40 generation ends; the 128ti badge is discontinued in the UK

Every engine fitted to the BMW 1 Series 128ti is covered below, with UK rebuilt pricing and known failure points.

Engine Codes & Pricing

BMW 1 Series 128ti Engine Codes Specifications & Replacement Cost

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

B48A20T1 — 2.0L Turbocharged Petrol (2020-2024)

Power Output: 265 hp (195 kW) @ 4,750-6,500 rpm
Torque: 400 Nm (295 lb-ft) @ 1,750-4,500 rpm
Displacement: 1,998 cc
Bore x Stroke: 82 mm x 94.6 mm
Compression Ratio: 9.5:1
Years Fitted: 2020-2024

Can’t find your exact engine code?-> Get quotes for B48A20T1 BMW 1 Series 128ti engine replacement

-> Get quotes for B48A20T1 BMW 1 Series 128ti engine replacement

Common Problems

BMW 1 Series 128ti Engine Problems Repair Cost vs Replacement

The BMW 1 Series 128ti is powered exclusively by the B48A20T1 engine - a 2.0-litre turbocharged four-cylinder that produces 265 hp and 400 Nm of torque. The B48 is BMW's most advanced four-cylinder petrol engine and is generally regarded as reliable, with far fewer reported issues than the N20 it replaced. The 128ti is a relatively modern car, so major engine failures are uncommon, but like all direct-injection engines, carbon buildup can occur over time. Every rebuilt engine supplied through EnginesMarket includes upgraded components and a minimum 12-month unlimited-mileage warranty.

Common failure points and repair options

Carbon Buildup on Intake Valves

Affected: BMW 1 Series 128ti (B48A20T1, higher-mileage examples, 2020-2024)
Typical failure mileage: 40,000-80,000 miles

Root cause

The B48 uses direct fuel injection, which means fuel is sprayed directly into the combustion chamber rather than over the intake valves. As a result, oil vapours from the crankcase ventilation system can accumulate on the intake valves over time, forming carbon deposits. This can restrict airflow and lead to reduced performance, rough idling, and in severe cases, misfires.

Repair options

Repair tier	Dealer price	Specialist price
Intake Valve Cleaning (Walnut Blasting)	£500-£800	£350-£600
Full Replacement - rebuilt engine	£4,000-£6,000	£2,800-£4,000

Our recommendation

The B48 is a reliable engine, and major failures are rare. The best approach is preventative maintenance - use high-quality fuel, ensure regular oil changes with BMW-approved oil, and consider an intake valve cleaning (walnut blasting) around 60,000-80,000 miles to prevent carbon buildup from affecting performance. If you experience rough idling or reduced power, have a diagnostic check performed before assuming the worst.

-> Compare rebuilt B48A20T1 BMW 1 Series 128ti engine prices

Cooling System & Oil Filter Housing Wear

Affected: BMW 1 Series 128ti (B48A20T1, higher-mileage examples, 2020-2024)
Typical failure mileage: 50,000-100,000 miles

Root cause

Like many modern BMW engines, the B48 can suffer from coolant leaks around the coolant flange pipe and oil filter housing. These are typically caused by plastic components becoming brittle with age and heat cycling.

Repair options

Repair tier	Dealer price	Specialist price
Coolant Leak Repair	£300-£600	£200-£400
Oil Filter Housing Gasket Replacement	£500-£900	£300-£600
Full Replacement - rebuilt engine	£4,000-£6,000	£2,800-£4,000

Our recommendation

Cooling system and oil leak issues on the B48 are usually repairable without engine replacement. Regular visual inspections during servicing can catch these issues early. Address coolant leaks promptly to prevent overheating, and fix oil leaks to maintain correct oil pressure.

-> Compare rebuilt BMW 1 Series 128ti B48 engine prices

Don't Let Engine Issues Write Off Your BMW 1 Series 128ti

The B48 engine in your BMW 128ti is one of BMW's most reliable four-cylinder engines - but like all modern direct-injection engines, it benefits from regular maintenance and preventative care. Whether you need a carbon clean to restore performance or a full rebuilt engine with upgraded components and a 12-month warranty, EnginesMarket connects you with vetted UK specialists who know the B48 inside out. Compare prices today and keep your BMW on the road.

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FAQ

BMW 1 Series 128ti Engine ReplacementFrequently Asked Questions

Everything BMW 1 Series 128ti owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

The BMW 128ti is powered by a 2.0-litre turbocharged four-cylinder petrol engine with the engine code B48A20T1. It produces 265 hp (195 kW) at 4,750-6,500 rpm and 400 Nm (295 lb-ft) of torque from 1,750-4,500 rpm. This makes it the most powerful four-cylinder engine BMW has ever produced.

Engine Code: B48A20T1
Displacement: 1,998 cc
Power: 265 hp
Torque: 400 Nm

-> Get a BMW 128ti engine diagnostic quote

Yes - the B48 engine in the BMW 128ti is generally considered one of BMW's most reliable four-cylinder engines. Unlike the earlier N20, the B48 has far fewer reported timing chain issues. Owners report that the F40 generation is well-built and reliable, with no major engine-related systemic problems. Regular maintenance - including oil changes with BMW-approved oil - is key to long-term reliability.

B48 is significantly more reliable than the N20 it replaced
No widespread timing chain issues reported
Regular maintenance is essential for longevity

-> Compare BMW 128ti engine prices - used, reconditioned and rebuilt

Both the BMW 128ti and M135i use the same B48 engine family, but with different power outputs and drivetrain configurations. The 128ti produces 265 hp and is front-wheel drive with a Torsen limited-slip differential, while the M135i produces 306 hp and is all-wheel drive (xDrive).

128ti: 265 hp, front-wheel drive, Torsen LSD
M135i xDrive: 306 hp, all-wheel drive

-> Compare BMW 1 Series engine options

Yes - every rebuilt BMW 1 Series 128ti engine supplied through EnginesMarket comes with a minimum 12-month unlimited-mileage warranty. This covers the engine against manufacturing defects and component failure, giving you peace of mind when investing in a replacement B48 unit.

12-month warranty is standard on all rebuilt engines
Some specialists offer extended warranty options
Always confirm exact warranty terms with your chosen supplier

-> Get a warranted BMW 128ti rebuilt engine quote

Why Choose Us

Compare BMW 1 Series 128ti Engine Prices Today

Comparing quotes for your BMW 1 Series 128ti engine replacement is completely free and carries no obligation. Enter your registration above, tell us your preferred engine condition - used, reconditioned or rebuilt - and receive tailored quotes from vetted UK specialists who know the B48 engine inside out. No spam, no pressure, just genuine prices from trusted BMW 128ti experts.

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