The BMW B48 A20 B is a 1,998 cc, inline — four turbocharged petrol engine introduced in 2015 as part of BMW's modular B — series engine family. It features an aluminium block and head, dual overhead camshafts (DOHC), and Valvetronic IV variable valve lift. In standard tune it delivers 135–195 kW (184–265 PS), with torque outputs ranging from 270–400 Nm, offering a balance of responsive performance and fuel efficiency.
Fitted across BMW's G — series platforms including the G2…
All production years 2015–present meet Euro 6 emissions standards .
The BMW B48 A20 B is a 1,998 cc inline-four turbocharged petrol engine engineered for compact and mid-size models (2015–present). It combines direct fuel injection with twin-scroll turbocharging to deliver strong low-end torque and linear power delivery. Designed to meet Euro 6 standards, it balances sporty performance with fuel economy and emissions compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,998 cc | |
Fuel type | Petrol | |
Configuration | Inline-4, DOHC, 16-valve with Valvetronic IV | |
Aspiration | Turbocharged (twin-scroll) | |
Bore × stroke | 82.0 mm × 94.6 mm | |
Power output | 135–195 kW (184–265 PS) | |
Torque | 270–400 Nm @ 1,550–4,400 rpm | |
Fuel system | High-pressure direct injection (up to 350 bar) | |
Emissions standard | Euro 6 (including GPF) | |
Compression ratio | 11.0:1 | |
Cooling system | Water-cooled with electric thermostat | |
Turbocharger | Single twin-scroll turbo (BorgWarner) | |
Timing system | Chain (front-mounted; wear-prone in early units) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 144 kg |
The BMW B48 A20 B was used across BMW's G20/G01 platforms with longitudinal mounting and shared architecture with Toyota for sports applications. This engine received platform-specific adaptations-reinforced mounts in the G01 and revised cooling layouts in the G29-and from 2020 the updated G20 LCI models adopted the B48TU variant with mild-hybrid integration, creating interchange limits. Partnerships allowed Toyota's 2.0L M176 units to leverage shared turbo and injection design principles. All adaptations are documented in OEM technical bulletins.
Engine Finders UK Ltd, which operates EngineCode.uk, can pass your enquiry to engine suppliers in the UK. The service is for vehicles in the United Kingdom, with UK delivery or fitting. This is a commercially connected service, and sending an enquiry does not confirm diagnosis or compatibility.
Diagnostic reminder: If a technician has recommended replacing the engine, you can send an enquiry to engine suppliers in the UK. Confirm the diagnosis first: an engine-code record does not diagnose a fault.
Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from manufacturer technical service bulletins and industry workshop records. Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The B48 A20 B offers strong performance and refinement, but early models (2015-2017) had reliability concerns, particularly timing chain failures. Later revisions (post-2018) improved chain durability, so well-maintained examples can be quite robust. Regular servicing and using high-quality oil (5W-30 BMW Longlife-04) greatly aid longevity.
The biggest issues are timing-chain wear (leading to rattle or breakage), turbo actuator sticking, and intake carbon buildup due to direct injection. Other complaints include oil leaks from gaskets and occasional GPF clogging. These are well-documented in BMW service bulletins and technical reports.
This 2.0L petrol was used in the G20 3 Series (320i, 330i), G01 X3 (xDrive20i, xDrive30i), G29 Z4 (sDrive20i, sDrive30i), and Toyota Supra (2.0L) from 2020-present. All applications meet Euro 6 standards with GPF.
Aftermarket ECU tuning is common on the B48A20B platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
Efficient for its performance class. In a BMW 330i (G20) from 2020, typical consumption is ~9.0 L/100km (city) and ~6.5 L/100km (highway), or about 35 mpg UK combined. Real-world figures depend on driving style, but expect 30-40 mpg (UK) on mixed roads for a healthy B48 A20 B.
Yes. The B48 series is an interference engine. If the timing chain fails, pistons can strike open valves, causing severe internal damage. That's why chain maintenance is critical—any rattling should be investigated immediately.
BMW specifies a 5W-30 synthetic oil meeting BMW Longlife-04 (or newer) spec. Always use a quality oil designed for turbocharged petrol engines and change it every 10,000–15,000 km as recommended to ensure proper chain lubrication and prevent carbon buildup.
Comprehensive technical documentation and regulatory references
EngineCode.uk is operated by Engine Finders UK Ltd. It provides engine-reference information and an optional commercial enquiry service. It is not an official manufacturer website. Check the record's sources and confirm vehicle-specific details before relying on it for parts, repairs or replacement.
Our editorial standard prioritises relevant manufacturer documentation and official regulatory sources. The sources and verification status for a record should be checked alongside the data.
A statement is not verified merely because a source is listed. Where supporting evidence is missing or conflicting, the record should identify that limitation. Please report unsupported or inconsistent information.
Transparency in gaps
A missing or unverified value does not mean the manufacturer has withheld it. We distinguish information not yet verified, information not available to us, and information explicitly not disclosed by the source.
Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
Records are subject to review and correction. Source links, dates and verification notes should be read with the technical information. Our Editorial and Sourcing Policy explains our standards and review process.
Found an error or missing source? Report a problem with this page. Include the field or statement concerned and a supporting source if available. You can also email corrections@enginecode.uk.
Copyright and permissions
Images and other material may be protected by copyright. Attribution does not by itself grant permission to reuse material. If you believe material on this site infringes your rights, contact copyrights@enginecode.uk with the page URL and details of your claim. We will review the material and take appropriate action.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
Our Privacy Policy explains how Engine Finders UK Ltd uses information from visits, vehicle lookups, enquiries and messages. Our Cookie Policy explains cookies and similar technologies and how to change your choices.
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
Ownership and commercial services
EngineCode.uk is owned and operated by Engine Finders UK Ltd. Alongside our reference content, we offer an optional replacement-engine enquiry service through Engine Finders and may identify relevant services provided by businesses connected with us. These commercial connections are disclosed. Using an enquiry service is not required to read our reference content.
Engine Finders UK Ltd operates this website. Our optional enquiry service has a commercial purpose. Our Ownership and Commercial Disclosure explains the relationship between the reference website and that service. Participating suppliers pay a fee or subscription to participate on the network and receive quote requests.
Use this record as a starting point for identification. Specifications and vehicle applications may contain errors or omissions. Confirm the exact engine variant and compatibility using vehicle-specific documentation and a qualified supplier or technician.
All external links open in new tabs. Please verify current availability of resources.