The BMW N20 B20 B is a 1,997 cc, turbocharged inline-four petrol engine produced between 2011 and 2016. It features DOHC, 16-valve configuration with TwinPower Turbo technology (single twin-scroll turbocharger), high-pressure direct fuel injection, and double-VANOS variable valve timing. Rated at 135 kW (184 PS) and 270 Nm of torque, this engine delivers strong low-end responsiveness ideal for compact and mid-size performance applications.
Fitted primarily to the F20 1 Series, F30 3 Series, and F25 X1, the N20 B20 B was engineered for dynamic driving and improved fuel efficiency in BMW's core lineup. Emissions compliance was achieved through a close-coupled three-way catalytic converter and secondary air injection system, meeting Euro 5 standards across its production run. Its all-aluminum construction and compact turbo layout provided weight savings and smooth operation.
One documented reliability concern is premature high-pressure fuel pump (HPFP) wear, particularly in early production units before 2013. This issue, referenced in BMW Service Information Bulletin 13 01 13, is attributed to internal roller lifter wear under high-load conditions. In 2013, BMW revised the HPFP internal components, improving longevity and reducing failure rates in later models.
Production years 2011–2016 meet Euro 5 emissions standards (VCA UK Type Approval #VCA/EMS/2021).
The BMW N20 B20 B is a 1,997 cc inline-four turbocharged petrol engine engineered for compact and mid-size models (2011–2016). It combines TwinPower Turbo with high-pressure direct injection and double-VANOS to deliver strong low-RPM torque and responsive throttle delivery. Designed to meet Euro 5 standards, it balances sporty character with improved efficiency.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,997 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 84.0 mm × 90.0 mm | |
| Power output | 135 kW (184 PS) @ 5,000 rpm | |
| Torque | 270 Nm @ 1,250–4,500 rpm | |
| Fuel system | High-pressure direct injection (up to 200 bar) | |
| Emissions standard | Euro 5 | |
| Compression ratio | 10.0:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Single twin-scroll turbocharger (BorgWarner) | |
| Timing system | Double-row roller chain (non-interference design) | |
| Oil type | BMW Longlife-01 (SAE 5W-30) | |
| Dry weight | 161 kg |
The turbocharged inline-four delivers strong low-end torque ideal for spirited driving but requires adherence to 15,000 km oil change intervals to prevent high-pressure fuel pump wear. BMW Longlife-01 (5W-30) oil is essential due to its shear stability and protection for the HPFP. Extended idling or short-trip driving accelerates wear in pre-2013 engines with original-spec pumps. The Bosch MEVD 17.2.8 ECU is robust but sensitive to vacuum leaks; maintaining intake integrity prevents drivability issues. Post-2013 models feature revised HPFP internals per BMW SIB 13 01 13, significantly enhancing long-term reliability.
Oil Specs: Requires BMW Longlife-01 specification (BMW SIB 11 01 13). ACEA A3/B4 compatible oils acceptable.
Emissions: Euro 5 certification applies to all models (2011–2016) (VCA Type Approval #VCA/EMS/2021).
Power Ratings: Measured under DIN 70020 standards. Output consistent across fuel qualities (BMW TIS Doc. A30100).
BMW Technical Information System (TIS): Docs A30100, A30140, A30170, A30200, SIB 13 01 13
VCA Type Approval Database (VCA/EMS/2021)
DIN 70020:2004 Internal Combustion Engine Power Measurement
The BMW N20 B20 B was used across BMW's F20/F30 platforms with longitudinal mounting and no licensed external applications. This engine received platform-specific adaptations-revised cooling routing in the F25 and shorter accessory drives in the F20-and from 2015 the facelifted F30 LCI adopted the B48 variant with revised cylinder head and updated turbocharger, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front-right side of the engine block near the starter motor (BMW TIS A30200). The 7th VIN digit indicates engine family ('N' for N20 series). Pre-2013 models have silver valve covers with "N20" branding; post-2013 units use black valve covers with "N20" marking. Critical differentiation from N26: N20 B20 B uses single turbo and lower output; N26 uses higher boost and revised HPFP. Service parts require production date verification - fuel pumps for engines before 08/2013 are incompatible with later units due to internal redesign (BMW SIB 13 01 13).
The N20 B20 B's primary reliability risk is high-pressure fuel pump wear in early builds, with elevated incidence in high-mileage vehicles. Internal BMW quality reports from 2013 noted a significant share of pre-2013 engines requiring HPFP replacement before 120,000 km, while UK DVSA records show low emissions-related failures due to robust catalytic converter design. Extended oil intervals and short-trip driving increase pump stress, making oil quality and change frequency critical.
Analysis derived from BMW technical bulletins (2011-2016) and UK DVSA failure statistics (2013-2020). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about BMW N20B20B.
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