BMW 1 Series 128ti Engine ReplacementCompare 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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12-Month Warranty
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From £1,595 to £3,500
Used from £1,295 · Reconditioned from £1,595 · Common codes: B48A20T1
From £1,295
Tested, bare/short engine
From £1,595
Rod bearings addressed, tested
From quote
Upgraded bearings, full teardown, revised valvetrain
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3 Simple Steps3 Simple Stepsto Finding the Best BMW 1 Series 128ti Replacement Engineto Finding the Best BMW 1 Series 128ti Replacement Engine
Most replacements completed within 3-5 days.
Variant HistoryBMW 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.
Variant HistoryBMW 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.
BMW 1 Series 128ti
Fuel TypePetrol
Engine Size2.0L (1,998 cc)
Power Output265 hp (195 kW) @ 4,750-6,500 rpmEngine History Timeline
Late 2020 - B48A20T1 2.0L turbocharged petrol, 265 hp (195 kW), launched as a standalone model in the F40 1 Series range
128ti continues production; 'ti' decals 18-inch wheels and passive sports suspension are standard
Minor updates; 128ti remains the front-wheel-drive performance flagship
Final year of production for the F40 generation 128ti
F40 generation ends; the 128ti badge is discontinued in the UK
Key Specs Snapshot
Fuel TypePetrolEngine Size2.0L (1,998 cc)Power Output265 hp (195 kW) @ 4,750-6,500 rpmTorque400 Nm (295 lb-ft) @ 1,750-4,500 rpmYears Produced2020-2024Every engine fitted to the BMW 1 Series 128ti is covered below, with UK rebuilt pricing and known failure points.
BMW 1 Series 128ti Engine Codes - Specifications & Replacement CostBMW 1 Series 128ti Engine Codes - Specifications & Replacement Cost
2.0L Turbocharged Petrol (2020-2024)
Power Output265 hp (195 kW) @ 4,750-6,500 rpmTorque400 Nm (295 lb-ft) @ 1,750-4,500 rpmDisplacement1,998 ccBore x Stroke82 mm x 94.6 mmCompression Ratio9.5:1Years Fitted2020-2024
Compatible Trim Levels
- 128ti
- 128ti with Tech Pack
- 128ti with LCP/Pro/Tech Pack
Find your exact engine code, specs and UK replacement cost guide.
Used
Tested, ready-to-fit engine
£1,295-£1,800
Reconditioned
Addressed known issues, tested
£1,595-£2,200
Rebuilt
Full teardown, upgraded internals
£2,500-£3,500
Common Failure
The B48 is generally considered one of BMW's most reliable four-cylinder engines, addressing many of the weaknesses of its predecessor, the N20. However, like all direct-injection engines, carbon buildup on intake valves can occur over time - particularly on vehicles driven mainly on short trips. Cooling system components and the oil filter housing are known wear points. Early reports from owners indicate intermittent brake groan in reverse, but no major engine-related systemic issues have been widely reported.
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.
B48 Direct Injection
Affected Vehicles
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.
Why It Happens
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.
Dealer (parts + labour)
£500-£800
Specialist (parts + labour)
£350-£600
What it involves
Media blasting to remove carbon deposits from intake valves
Suitability
Cost-effective maintenance for higher-mileage cars
1 - 2 daysDealer (parts + labour)
£4,000-£6,000
Specialist (parts + labour)
£2,800-£4,000
What it involves
Complete rebuilt unit with new components
Suitability
If carbon buildup has caused significant damage
1 - 2 daysAll prices are indicative UK market ranges based on current UK specialist supplier data.| Repair Tier | Dealer (Parts + Labour) | Specialist (Parts + Labour) | What It Involves | Suitability | Estimated Time |
|---|---|---|---|---|---|
 Intake Valve Cleaning (Walnut Blasting) Minor | £500-£800 | £350-£600 | Media blasting to remove carbon deposits from intake valves | Cost-effective maintenance for higher-mileage cars | 1 - 2 days |
 Full Replacement - rebuilt engine Best Value | £4,000-£6,000 | £2,800-£4,000 | Complete rebuilt unit with new components | If carbon buildup has caused significant damage | 1 - 2 days |
Vehicle Value Check
Vehicle Value Check
A typical 2020-2024 BMW 1 Series 128ti is currently valued at approximately £20,000-£28,000 depending on mileage, condition and specification. This places the 128ti firmly in the bracket where a rebuilt engine is a viable investment - replacement cost is typically small relative to vehicle value. For well-maintained, lower-mileage examples, a preventative carbon clean is a cost-effective way to maintain performance.
Our Recommendation
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.
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.
Compare rebuilt B48A20T1 BMW 1 Series 128ti engine prices
12-Month Minimum
UK Specialists Vetted
Best Price GuidanceImportant Information
Important Information
"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 1 Series 128ti. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier."
BMW 1 Series 128ti Engine ReplacementFrequently Asked Questions
Question 1How 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.
- Used B48A20T1 engines: £1,295-£1,800
- Reconditioned B48A20T1: £1,595-£2,200
- Rebuilt B48A20T1 with warranty: £2,500-£3,500
Question 2What engine is in the BMW 128ti-
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
Question 3Is the BMW 128ti engine reliable-
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
Question 4How 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.
- Supply-only: engine delivered next working day in many cases
- Supply and fit: allow 2-3 working days
- Mobile fitting options available through some specialists
Question 5What's the difference between the BMW 128ti and M135i-
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
Question 6Does a BMW 1 Series 128ti rebuilt engine come with a warranty-
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
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