Engines Market

BMW 135i SPECIALISTS

BMW 1 Series 135i Engine Replacement Compare Prices & Get Quotes

Get quotes today from trusted UK BMW 1 Series 135i engine specialists. Compare prices on reconditioned, rebuilt and used engines for your BMW 135i - covering the 3.0-litre N55 turbocharged straight-six in the E82 coupe, E88 convertible and early F20 hatchback, through to the B58 engine in later F20 M135i models.

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BMW 1 Series 135i Engine
from£1,800 to £8,000...
  • Usedfrom £1,500
  • Reconditionedfrom £4,000
  • Common codesN55B30A, N55B30M0, B58B30
BMW 1-series 135i Used Engine — N55B30ABMW 1-seriesUsed Engine — N55B30ABMW 1-series 135i Reconditioned Engine — N55B30ABMW 1-seriesReconditioned Engine — N55B30ABMW 1-series 135i Rebuilt Engine — N55B30ABMW 1-seriesRebuilt Engine — N55B30A

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Variant History

BMW 1 Series 135i Engine History & Specs at a Glance

The BMW 135i was launched in 2008 as the performance flagship of the first-generation 1 Series range, powered by a 3.0-litre twin-turbo N54 engine. In 2010, the N54 was replaced by the N55 - BMW's first production engine to combine a single twin-scroll turbocharger with Valvetronic and direct injection. The 135i badge continued through the E82 coupe, E88 convertible and into the F20 hatchback as the M135i, before being replaced by the M140i with the B58 engine in 2016.

BMW 1 Series 135i
  1. 2008

    N54B30, 3.0L twin-turbo straight-six, 306 hp, launched in the E82 coupe and E88 convertible

  2. 2010

    N55B30A, 3.0L single twin-scroll turbo straight-six, 306 hp, replaces the N54 in the E82/E88 135i

  3. 2012

    N55B30A, 3.0L single turbo straight-six, 320 hp, launched in the F20 five-door and F21 three-door M135i

  4. 2015

    B58B30, 3.0L single twin-scroll turbo straight-six, 326 hp, introduced in later F20 M135i models

  5. 2016

    M135i renamed M140i with B58 engine; the 135i badge is retired in the UK

Every engine fitted to the BMW 1 Series 135i is covered below, with UK rebuilt pricing and known failure points.

Engine Codes & Pricing

BMW 1 Series 135i Engine Codes Specifications & Replacement Cost

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

N55B30A — 3.0L Turbocharged Petrol (2010-2012, E82/E88 135i) engine

N55B30A — 3.0L Turbocharged Petrol (2010-2012, E82/E88 135i)

Power Output
306 hp (225 kW) @ 5,800 rpm
Torque
400 Nm @ 1,200-5,000 rpm
Displacement
2,979 cc
Years Fitted
2010-2012

Can’t find your exact engine code?-> Get quotes for N55B30A BMW 1 Series 135i engine replacement

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Common Problems

BMW 1 Series 135i Engine Problems Repair Cost vs Replacement

The BMW 1 Series 135i is powered by 3.0-litre turbocharged straight-six engines across its production life. Early cars use the N55 (and earlier N54), which is generally reliable but has well-documented issues with oil leaks, VANOS solenoids, and the cooling system. Later B58-powered cars are more robust but have their own early-production concerns, particularly around the oil pump drive system. Replacement demand for the BMW 135i is typically lower than for four-cylinder BMWs, but when failures occur, the cost of repair can be significant. Every rebuilt engine supplied through EnginesMarket includes upgraded components addressing the original failure points, plus a minimum 12-month unlimited-mileage warranty.

Common failure points and repair options

Oil Leaks

Affected
BMW 1 Series 135i (N55B30, 2010-2015)
Typical failure mileage
50,000-100,000 miles
Root cause
The N55 engine uses gaskets and seals that can become brittle and leak over time. The valve cover gasket, oil filter housing gasket, and VANOS solenoid seals are the most common leak points. A leaking valve cover gasket can cause oil to drip onto the exhaust manifold, producing a burning smell and smoke. On the N54 and N55, multiple leak sources in close proximity can make it difficult to identify the primary source.

Repair options

Repair tierDealer priceSpecialist price
Valve Cover Gasket Replacement£600-£900£400-£600
Oil Filter Housing Gasket Replacement£500-£800£300-£500
VANOS Solenoid Seal Replacement£400-£700£250-£450
Full Replacement - rebuilt engine£6,000-£9,000£4,500-£7,000
Our recommendation
The N55 is a reliable engine, and oil leaks are the most common issue. Address gasket leaks promptly - a £300-£600 specialist repair is far cheaper than dealing with the consequences of a major oil leak. If you notice white smoke or a burning smell, have the valve cover gasket inspected immediately. Unlike the N20, the N55 does not have widespread timing chain issues, making it a more dependable choice for long-term ownership.
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VANOS Solenoid & Valvetronic System Failure

Affected
BMW 1 Series 135i (N55B30, 2010-2015)
Typical failure mileage
60,000-120,000 miles
Root cause
The N55's VANOS system uses solenoids to control variable valve timing. These solenoids can become clogged or fail, leading to rough idling, reduced power and engine warning lights. Valvetronic eccentric shaft wear is another known issue - if the motor worm gear becomes damaged, the likelihood that the gears on the eccentric shaft are damaged increases. In severe cases, the eccentric shaft can wear into the cylinder head, requiring head replacement or a new engine.

Repair options

Repair tierDealer priceSpecialist price
VANOS Solenoid Replacement£400-£700£250-£450
Valvetronic Motor Replacement£600-£1,000£400-£700
Eccentric Shaft Replacement£1,500-£2,500£1,000-£1,800
Full Replacement - rebuilt engine£6,000-£9,000£4,500-£7,000
Our recommendation
VANOS and Valvetronic issues are usually repairable without engine replacement. A diagnostic scan will identify if fault codes are present. Cleaning or replacing the solenoids is a straightforward job for a specialist. If Valvetronic motor failure is detected, have the eccentric shaft inspected - catching wear early can prevent a much more expensive repair.
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Electric Water Pump & Cooling System Failure

Affected
BMW 1 Series 135i (N55B30, 2010-2015)
Typical failure mileage
60,000-100,000 miles
Root cause
The N55 uses an electric water pump that can fail without warning. Unlike belt-driven pumps, an electric pump failure may not be preceded by a visible leak. If the pump fails, the engine can overheat rapidly, potentially causing head gasket failure or worse.

Repair options

Repair tierDealer priceSpecialist price
Water Pump & Thermostat Replacement£700-£1,100£450-£750
Full Replacement - rebuilt engine£6,000-£9,000£4,500-£7,000
Our recommendation
Water pump and thermostat replacement is recommended as preventative maintenance around 80,000-100,000 miles. If your 135i has not had the water pump replaced, consider doing so proactively - it's significantly cheaper than dealing with an overheated engine.
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B58 Oil Pump Drive Gear Failure (Early Production)

Affected
BMW 1 Series 135i (B58B30, 2015-2016, early production)
Typical failure mileage
30,000-60,000 miles
Root cause
Early production B58 engines (2016-2018) have reported oil pump drive gear issues, particularly under high-stress driving. The oil pump chain guide used plastic components that can break under normal operating stress. A distinctive humming or whining noise from the engine, especially during cold starts, can indicate oil pump failure.

Repair options

Repair tierDealer priceSpecialist price
Oil Pump Drive Gear Replacement£1,500-£2,500£1,000-£1,800
Full Replacement - rebuilt engine£7,000-£10,000£5,000-£7,500
Our recommendation
If your B58-powered 135i produces a humming or whining noise from the engine on cold start, have the oil pump drive system inspected immediately. Early detection can prevent catastrophic engine failure. BMW has repaired this issue under warranty for many affected vehicles, but if your car is out of warranty, a specialist repair is significantly cheaper than a full engine replacement.
-> Compare rebuilt B58B30 BMW 1 Series 135i engine prices

Don't Let Engine Failure Write Off Your BMW 1 Series 135i

The N55 engine in your BMW 135i is one of BMW's most celebrated turbocharged straight-sixes - a reliable, characterful engine that deserves proper maintenance. Oil leaks, VANOS issues and water pump failure are the most common problems, and all are repairable without replacing the entire engine in most cases. Later B58-powered cars are more robust but require vigilance for early oil pump issues. Whether you need a preventative water pump replacement or a full rebuilt engine with upgraded components and a 12-month warranty, EnginesMarket connects you with vetted UK specialists who know the N55 and B58 inside out. Compare prices today and keep your BMW on the road.

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FAQ

BMW 1 Series 135i Engine ReplacementFrequently Asked Questions

Everything BMW 1 Series 135i owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

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