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

Engine Mechanical ⚡ Express

BMW M Engines: S54, S65, S55, and S58 — Problems, Maintenance, and How to Choose

A complete guide to BMW M engines: S54, S65, S55, and S58. Learn the problems, maintenance, and buying advice for the E46 M3, E9x M3, F80/F82 M3/M4, and G80/G82 M3/M4.

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Car Overview ⚡ Express

BMW G30: A Full Breakdown of Problems, Engine Life, and Buying Secrets

The BMW G30 is a popular 5 Series generation (2017–2023). Typical problems, B48 and B58 engine life, maintenance advice, and a checklist for buying a used car.

Engine Mechanical ⚡ Express

BMW G11/G12 (2015–2016): Technical Secrets of the B58 and N63 Engines

The technical secrets of the B58 and N63 engines in the BMW G11/G12 (2015–2016): Valvetronic innovation, SCC segment cooling, 8th-generation Bosch DME modules, and the 8HP50/75 transmissions.

Car Overview ⚡ Express

BMW G20 (3 Series): A Complete Breakdown of Reliability, Problems, and Maintenance for Owners

A full reliability breakdown of the BMW G20 (3 Series, 2018+): typical problems at 37,000–62,000 miles, the maintenance schedule, a pre-purchase checklist, and a comparison with the F30. Find out whether the G20 is worth buying in 2025.

Car Overview ⚡ Express

BMW E90: The Complete Guide to Buying, Owning, and Repairing

The complete guide to buying, owning, and repairing a BMW E90: common problems, the N54, the 335d diesel, and a pre-purchase checklist.

Maintenance ⚡ Express

BMW E60 M47N2: EGR Valve Cleaning — Causes, Symptoms, and the Complete Guide

A complete guide to EGR valve cleaning on the BMW E60 with the M47N2 diesel: why the valve clogs, the failure symptoms, step-by-step removal and cleaning instructions, service recommendations, and the mistakes to avoid.

Car Overview ⚡ Express

BMW E90 (2005–2012): The Complete Guide to Buying, Problems, and Maintenance

A complete guide to the BMW E90 (2005–2012): engine overview, common problems, maintenance tips, and a pre-purchase checklist. Find out how to pick a reliable one and avoid expensive failures.

Engine Mechanical ⚡ Express

BMW F10 Engine Mount Replacement: Causes, Symptoms, and Step-by-Step Guide

Learn how to replace the engine mounts on your BMW F10: wear causes, failure symptoms, part numbers, and a step-by-step guide. Extend engine life and avoid turbo failures.

Car Overview ⚡ Express

BMW E60 (2004–2010): The Complete Guide to Buying, Maintenance, and Common Problems

A complete buying and ownership guide for the BMW E60 (2004–2010): common problems with the suspension, electronics, V10 S85 engine, and transmission. Inspection checklist and buying advice.

Cooling System Overview

How It Works

The electric water pump (EWP) is a BMW-specific weak point. It's controlled by the engine control unit and can fail at any time—sometimes with no warning at all. The N54, N55, N63, and many other inline-sixes are most often affected.