BMW Knowledge Base

Technical articles, diagnostic guides and deep dives into problem BMW components.

951 articles in the base · updated regularly

All Cooling System 22 OBD-II Diagnostics 34 Transmission 16 Buying Guide 60 Engine Mechanical 377 Car Overview 327 Maintenance 47 Suspension 1 Electrical System 24

Car Overview ⚡ Express

BMW E60 N52: Complete Guide to Reliability, Problems, and Maintenance

A complete guide to the BMW E60 with the N52 engine: technical highlights, common problems, maintenance, and a pre-purchase checklist. Reliability, ownership costs, and whether it's worth buying in 2025.

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Car Overview ⚡ Express

BMW E46: Complete Guide to Common Faults and Maintenance

A complete guide to common faults and maintenance on the BMW E46. We break down the weak points: cooling system, VANOS, turbocharger, suspension, electrics, and body. Practical prevention tips and a buyer's checklist.

Engine Mechanical ⚡ Express

The Complete Guide to BMW N55 (F30/F31) Maintenance: Longevity, Problems, and Tuning

Complete guide to the BMW N55 engine in the 335i (F30/F31, 2012–2015): maintenance schedule, typical problems (cracked charge pipe, oil leaks, HPFP failure), tips for extending engine life, and safe tuning. Find out how to make your N55 last and avoid costly repairs.

Engine Mechanical ⚡ Express

The Complete Guide to BMW Engines: Common Problems, Maintenance, and Pre-Purchase Inspection

The complete guide to BMW engines: common problems, maintenance, and pre-purchase inspection. Learn the weak spots of BMW engines, care tips, and a diagnostic checklist.

Engine Mechanical ⚡ Express

BMW B58 Engine: Complete Guide to Operation, Common Problems, and Repair

A complete guide to operating and repairing BMW's B58 engine. Common problems: oil consumption, the timing chain, the turbo, the ZF 8HP transmission, electrics, suspension, and the cooling system—plus maintenance tips to extend engine life.

Car Overview ⚡ Express

BMW E39: The Complete Guide to Buying, Maintaining, and Tuning the Legendary 5 Series

The complete guide to the BMW E39: buying, maintenance, and tuning for the legendary 5 Series. Learn about typical suspension problems, how to restore sharp handling, a buyer's checklist, and engine, exhaust, and brake upgrade options.

Car Overview ⚡ Express

BMW 2 Series G42 (2021–2025): Complete Guide to Engines, Problems, and Maintenance

The complete guide to the BMW 2 Series G42 (2021–2025): B48 and B58 engine overview, common problems, maintenance schedule, and a used-buyer inspection checklist. Tips to cut costs and extend engine life.

Car Overview ⚡ Express

BMW G11/G12 (2015–2022): The Complete Guide to Buying, Problems, and Maintenance

Complete buyer's and owner's guide to the BMW G11/G12 (2015–2022). Typical problems of the B48, B58, N63, N74, and B57 engines, the ZF 8HP transmission, air suspension, and electronics — plus repair advice and a pre-purchase checklist.

Car Overview ⚡ Express

BMW E90 (2004-2013): The Complete Buyer’s Guide to Versions, Engines, and Problem Areas

A complete guide to buying and maintaining the BMW E90 (2004-2013): gasoline and diesel engine breakdown, common problems, a buyer's checklist, and where the real repair money goes.

Cooling System Overview

BMW Coolant Loss: An Overview of the Problem

Coolant loss is a widespread BMW problem — especially on the N63 (V8 twin-turbo), N20/N26, and the N54/N55 inline-sixes. Causes range from porous plastic radiators to the classic head gasket. This hub collects causes, diagnosis, costs, and prevention strategies.