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

Buying Guide Overview

BMW 3 Series G20 320d: Buyer’s Guide

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Car Overview ⚡ Express

BMW E39: The Complete Guide to Buying, Owning, and Repairing the Legendary 5 Series

The complete guide to the BMW E39: specs, common problems, maintenance tips, a pre-purchase checklist, and how to choose the right engine. Here's how to extend the life of the legendary 5 Series.

Car Overview Overview

BMW 520d G30: Review, Reliability, and Ownership Impressions

Engine Mechanical ⚡ Express

BMW M3 F80: Complete Guide to the S55 Engine, Problems, and Maintenance

Complete guide to the BMW M3 F80: S55 engine specs, common problems (rod bearing wear, oil leaks, HPFP failure), maintenance intervals, and a checklist for buying a used car.

Engine Mechanical ⚡ Express

BMW B58 Engine: Lifespan, Problems, and Maintenance (2016–2022)

The BMW B58 is a turbocharged 3.0-liter inline-six gasoline engine in production since 2016. Here's what owners need to know about its lifespan (over 310,000 miles), the common failure points (oil pump, PCV valve, coolant leaks), and how to maintain it properly.

Engine Mechanical ⚡ Express

BMW M54 Engine: Reliability, Problems, and Ownership Secrets

The BMW M54 is one of BMW's best inline-six engines. Its technical traits, typical problems, maintenance advice, and a pre-purchase checklist—practical guidance for owners.

Engine Mechanical ⚡ Express

BMW M3 E92 Throttle Actuators: Complete Diagnosis and Repair Guide

A complete guide to diagnosing and repairing the throttle actuators on a BMW M3 E92. Learn the failure symptoms, the step-by-step DIY fix, prevention, and alternative solutions. Save up to $1,100 on the repair.

Engine Mechanical ⚡ Express

BMW N63 Engine: Problems, Longevity, and the Complete Owner’s Guide

A complete guide to the BMW N63 engine: specs, common problems (oil consumption, coolant pipe leaks), maintenance, service life, and tips for extending it. Includes a pre-purchase checklist and repair advice.

Car Overview Overview

BMW 5 Series G30 520d Review and Test Drive: The Executive Sedan That Sets the Standard

Car Overview ⚡ Express

BMW E46 M54B25: The Complete Guide to Buying, Owning, and Repairing

A complete guide to the BMW E46 with the M54B25 engine: model overview, specs, common problems, maintenance advice, and a buying checklist to help you pick a solid car and extend its service life.