How much does a BMW 2 Series G42 engine replacement cost in the UK?

A reconditioned G42 engine typically costs £2,500–£7,500 supply only, depending on engine -the B48 four-cylinder sits at £2,500–£5,000, while the B58 straight-six can reach £4,500–£7,500. Fitting adds £650–£1,040. Use our calculator for a personalised figure.

Which BMW 2 Series G42 engine is the most reliable?

The B58 3.0-litre straight-six in the M240i xDrive has developed a reputation as one of BMW's most dependable modern engines -robust, smooth, and well-proven across the G20 3 Series and G22 4 Series. The B48 four-cylinder is also well-regarded for its reliability and efficiency.

What are the common problems with the BMW 2 Series G42?

Water pump and cooling system failures on all B-series engines (B48, B47, B58), PCV valve issues on the B58, EGR cooler and DPF issues on the B47 diesel, and -unrelated to the engine -the occasional infotainment system glitches and 48V mild-hybrid system gremlins.

Is the BMW 2 Series G42 reliable?

The G42 is still relatively new, but early indications are positive. The B58 engine has a strong reputation for reliability, and the B48 is well-proven from its use across the BMW range. The B47 diesel is also generally reliable, though it has the usual diesel emissions system complexity. Overall, the G42 appears to be a dependable modern BMW.

Which BMW 2 Series G42 engine should I avoid?

No engine is inherently problematic, but the B47 diesel (220d) is more complex than the petrol options -if you don't do high mileage, the petrol B48 or B58 is a simpler choice. The M240i's B58 is a performance engine with higher running costs -budget accordingly.

How do I know if my G42 engine needs replacing?

Overheating with no obvious external leak (cooling system failure), persistent check engine lights, rough idle, or increased oil consumption (B58 PCV valve) are the key warning signs. Use our diagnostic calculator for a personalised assessment.

Is it worth replacing a BMW 2 Series G42 engine, or should I scrap the car?

On a G42, replacement almost always makes sense. Against a £35,000 G42, a £5,000 B58 recon is 14% of the car's value -well within our 70% BMW threshold. Even against a lower-value example, the G42's relatively high retained value means replacement is financially viable.

How long do BMW 2 Series G42 engines last?

The B58 can exceed 150,000–200,000 miles with proper maintenance. The B48 is similarly durable. The B47 diesel can also reach high mileage -but requires regular servicing and DPF maintenance. The G42's engines are built on well-proven architectures.

What is the difference between the G42 and the F22?

The G42 is the second-generation 2 Series Coupé (2021–present), built on the CLAR platform with a larger footprint, more advanced technology, and a range of B-series engines. The F22 is the first-generation 2 Series Coupé (2014–2021), built on the older E9x-derived platform with N-series engines. The G42 is significantly more refined and technologically advanced.

How do I find my BMW 2 Series G42 engine code?

Listed on the VIN plate and vehicle documentation; block stamping is visible on the engine itself. Tell us your variant (220i, 230i, M240i, 220d) and we'll identify it -20+ vetted specialists will confirm it for free.

BMW 2 Series G42Coupé2021–present

BMW 2 Series G42 Engines — The Complete UK Guide

Every engine fitted to the G42 coupé — from the B48 four-cylinder petrol to the B58 straight-six in the M240i.

Real UK replacement costs, honest failure data, and the B58's bulletproof reputation.

Backed by verified specialist data.

Explore G42 Engines

Current Model -Pattern Data
Coupé
6+Engine Codes
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Current Model -Pattern Data
CoupéBody Style
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Engine Database

BMW 2 Series G42 Engine Codes — The Complete Database

Every engine fitted to the G42 coupé — from the 2.0-litre four-cylinder B48 to the 3.0-litre straight-six B58 in the M240i xDrive.

Engine CodeFuelPowerYearsReliabilityEnquiries (2025)Avg. Recon Cost

B48B20A / B48B20M0B48PetrolTurbo156–184 bhp2021–present★★★★☆PATTERN DATA—(pattern data)£2,500–£4,500[PLACEHOLDER]

B48B20B / B48B20O1B48PetrolTurbo241–258 bhp2022–present★★★★☆PATTERN DATA—(pattern data)£2,800–£5,000[PLACEHOLDER]

B47D20BB47DieselTurbo190 bhp2021–present★★★★☆PATTERN DATA—(pattern data)£2,800–£5,000[PLACEHOLDER]

B58B30B / B58B30O1B58PetrolTurbo374–382 bhp2021–present★★★★★PATTERN DATA——

Overview

BMW 2 Series G42 — Overview

The G42 is the second generation of the BMW 2 Series Coupé, launched in July 2021 as the successor to the F22. Built on the CLAR platform shared with the G20 3 Series and G22 4 Series, it retains rear-wheel drive — unlike the front-wheel-drive 1 Series — and offers a 50:50 weight distribution.

Production began in September 2021 at BMW's San Luis Potosí plant in Mexico — the first BMW designed by BMW of Mexico.

Key Facts

PlatformBMW CLAR (shared with G20 3 Series, G22 4 Series)
PredecessorBMW 2 Series F22
SuccessorCurrent model — no successor announced
Sibling Body Styles in this GenerationCoupé only (no convertible)

Market Intelligence

As a relatively new model (2021–present), the G42 is still establishing its long-term reliability profile — but the B58 engine in the M240i is already developing a reputation as one of BMW's most dependable modern six-cylinders.

04Best & Worst Engines

Best & Worst Engines

Thin-Data Summary

The G42's engine range is modern, efficient, and broadly dependable. The B58 3.0-litre straight-six in the M240i xDrive is the standout — 374–382 bhp, 500 Nm of torque, and a reputation for bulletproof reliability that has made it a favourite across the BMW range. The B48 2.0-litre four-cylinder (220i, 230i) is the volume choice — responsive, efficient, and well-proven from its use across the G20 3 Series and G22 4 Series. The B47 2.0-litre diesel (220d) offers 190 bhp and strong economy, with mild-hybrid assistance for improved efficiency. All G42 engines are paired with an eight-speed Steptronic automatic transmission — no manual is available. If you're buying a G42, the B58 is the emotional choice; the B48 is the sensible one; the B47 is for high-mileage drivers.

Thin-Data Summary

BMW 2 Series G42
Ownership Economics

Engine

Typical Mileage

Common Major Failure

Repair Cost (Specialist)

Replacement Cost (Recon)

Ownership Verdict

B48 2.0 (218i/220i)40k–80kWater pump, VANOS solenoids£500–£1,200£2,500–£4,500

Solid Choice -well-proven B48

B48 2.0 (230i)40k–80kWater pump, cooling system£500–£1,200£2,800–£5,000

Best Petrol 4-Cyl -more power, same reliability

B47 2.0 Diesel (220d)40k–80kEGR cooler, DPF, timing chain (rare)£600–£1,500£2,800–£5,000

Best Diesel -efficient, mild-hybrid assistance

B58 3.0 (M240i xDrive)30k–70kPCV valve, water pump, coolant leaks£800–£2,000£4,500–£7,500

Best Overall -the B58 is a modern legend

Engine

Typical Mileage

Common Major Failure

Repair Cost (Specialist)

Replacement Cost (Recon)

Ownership Verdict

B48 2.0 (218i/220i)40k–80kWater pump, VANOS solenoids£500–£1,200£2,500–£4,500

Solid Choice -well-proven B48

B48 2.0 (230i)40k–80kWater pump, cooling system£500–£1,200£2,800–£5,000

Best Petrol 4-Cyl -more power, same reliability

B47 2.0 Diesel (220d)40k–80kEGR cooler, DPF, timing chain (rare)£600–£1,500£2,800–£5,000

Best Diesel -efficient, mild-hybrid assistance

B58 3.0 (M240i xDrive)30k–70kPCV valve, water pump, coolant leaks£800–£2,000£4,500–£7,500

Best Overall -the B58 is a modern legend

The G42 rule

A £4,500–£7,500 B58 recon against a £35,000 G42 sits at 13–21% of the car's value -well within our 70% BMW threshold. Against a £50,000 example, the same recon drops to 9–15% -a routine maintenance decision. On a G42, replacement almost always makes sense.

Key Takeaways

Which G42 Costs Least To Own?
B48 220i -simpler than the B58, lower running costs.
Which G42 Costs Most To Own?
B58 M240i -more complex, higher servicing costs.
Which G42 Is Best Value?
B48 230i -six-cylinder performance feel on a four-cylinder budget.

Common Problems

B48/B58

Cooling System & Water Pump Failure

Affected models:

G42 218i, 220i, 230i (B48), M240i (B58) -all models.

Typical failure mileage:

40,000–80,000 miles.

Root cause:

BMW's B-series engines use an electric water pump that has a finite service life. The water pump can fail without warning, causing overheating. The cooling system also has plastic components (thermostat housing, coolant pipes) that can become brittle with age and heat cycling.

Our Recommendation

Replace the water pump proactively at 60,000–80,000 miles on any G42 -a £400–£800 preventative job is far cheaper than a £2,500+ engine replacement. Monitor the temperature gauge and investigate any coolant loss immediately.

Compare B48/B58 engine prices for your G42

B58

PCV Valve & Oil Consumption

Affected models:

G42 M240i xDrive (B58, 2021–present).

Typical failure mileage:

30,000–70,000 miles.

Root cause:

The B58's Positive Crankcase Ventilation (PCV) valve can fail, causing increased oil consumption, rough idle, and check engine lights. The PCV valve is integrated into the valve cover on some B58 variants, making replacement more expensive than on earlier BMW engines.

Our Recommendation

Monitor oil consumption on your M240i -if you're topping up more than 1 litre between services, have the PCV system inspected. A £150–£300 inspection is far cheaper than a £800+ valve cover replacement.

Compare B58 engine prices for your M240i

B47

Diesel EGR Cooler & DPF Issues

Affected models:

G42 220d (B47, 2021–present).

Typical failure mileage:

40,000–80,000 miles.

Root cause:

The B47 diesel's EGR cooler can develop internal leaks, allowing coolant to enter the exhaust system and potentially cause engine damage. The DPF can also clog on vehicles used primarily for short urban journeys.

Our Recommendation

If your 220d is used primarily for short journeys, budget for regular DPF regeneration and consider an extended motorway run every few weeks. Have the EGR cooler inspected at every major service.

Compare B47 engine prices for your 220d

G42
Engine Replacement Costs -By Engine and Condition

Variant

Engine Code

Used (Supply)

Reconditioned (Supply)

Rebuilt (Supply)

Labour Hours

218i / 220iB48B20A / B48B20M0£1,500–£2,800£2,500–£4,500£4,000–£6,00010–14 hrs

230iB48B20B / B48B20O1£1,800–£3,200£2,800–£5,000£4,500–£6,50010–14 hrs

220dB47D20B£1,800–£3,200£2,800–£5,000£4,500–£6,50010–14 hrs

M240i xDriveB58B30B / B58B30O1£2,800–£4,500£4,500–£7,500£6,000–£9,50012–16 hrs

Diesel & Petrol Lineup

Diesel Variants

220d

Petrol Variants

Scope note: All variants listed are G42-generation 2 Series Coupé only (2021–present). The G42 is not available as a convertible -the F23 convertible was discontinued and not replaced.

Market Intelligence

Most Requested Engines (2025)

Most Requested Variants

Average Replacement Cost

Most Common Failures

Most Requested Engines (2025)

Most Requested Variants

Average Replacement Cost

Most Common Failures

Most Requested Engines (2025)

Most Requested Variants

Average Replacement Cost

Most Common Failures

Diesel & Petrol Lineup

Diesel Variants

220d

Petrol Variants

Scope note: All variants listed are G42-generation 2 Series Coupé only (2021–present). The G42 is not available as a convertible -the F23 convertible was discontinued and not replaced.

Market Intelligence

Most Requested Engines (2025)

Most Requested Variants

Average Replacement Cost

Most Common Failures

Most Requested Engines (2025)

Most Requested Variants

Average Replacement Cost

Most Common Failures

Most Requested Engines (2025)

Most Requested Variants

Average Replacement Cost

Most Common Failures

FAQ

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BMW 2 Series G42 Engines — The Complete UK Guide

BMW 2 Series G42 Engine Codes — The Complete Database

BMW 2 Series G42 — Overview

Best & Worst Engines

BMW 2 Series G42 Ownership Economics

Common Problems

G42Engine Replacement Costs -By Engine and Condition

Diesel & Petrol Lineup

Market Intelligence

Diesel & Petrol Lineup

Market Intelligence

FAQ

Why UK BMW 2 Series G42 OwnersTrust bmwengines.uk

BMW 2 Series G42
Ownership Economics

G42
Engine Replacement Costs -By Engine and Condition

Why UK BMW 2 Series G42 Owners
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