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 series:

All B47 B48 B57 B58 N20 N47 N52 N57 S55 S58

Engine Mechanical ⚡ Express

BMW N20 Engine: Problems, Service Life, and Tuning—The Complete Owner’s Guide

A complete guide to the BMW N20 engine: specifications, common timing chain problems, a 124,000–155,000-mile service life, maintenance tips, and safe tuning. Learn how to extend the engine's life and avoid a costly rebuild.

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Engine Mechanical ⚡ Express

BMW M52 Engine: The Complete Guide to Ownership, Problems, and Tuning

The complete guide to the BMW M52 engine: history, common problems, maintenance schedule, pre-purchase checklist, tuning, and how it compares to other engines. Learn how to stretch its life to 249,000 miles.

Engine Mechanical ⚡ Express

BMW B58 Engine: The Complete Guide to Tuning, Problems, and Maintenance

A complete guide to the BMW B58 engine: specs, common problems and their fixes, maintenance tips, a used-car buying checklist, and tuning stages. Learn how to extend the engine's life and avoid mistakes when building power.

Engine Mechanical ⚡ Express

BMW N52 Crankshaft Position Sensor: Symptoms, Diagnosis, and Replacement

BMW N52 crankshaft position sensor failure: engine stalls, code P0335, misfires, and higher fuel consumption. How to diagnose and replace the CKP sensor before it turns into a costly repair.

Engine Mechanical ⚡ Express

BMW B48 Engine: Overview, Problems, Longevity, and Tuning

The BMW B48 is a 2.0-liter turbocharged engine in production since 2014. A look at its specs, common problems, maintenance schedule, and tuning potential—and how to extend engine life while avoiding costly repairs.

Engine Mechanical ⚡ Express

BMW N55 Engine: Problems, Longevity, and Should You Buy One?

The BMW N55 engine: common problems, longevity, and ownership tips. Find out whether a car with this engine is worth buying, how to extend its life, and what to look for before you commit.

Engine Mechanical Overview

BMW Won’t Start: Causes and a Quick Check

When a BMW won't start at all, the most common causes are the battery and electrical system, the immobilizer (EWS/CAS), the starter motor, the crankshaft sensor, or the fuel supply.

Engine Mechanical Overview

What’s Physically Behind a Misfire

A shaking BMW usually points to misfires (ignition coils, spark plugs), dirty or failing injectors, a leaking charge air system, vacuum leaks, or—on a diesel—DPF/EGR problems.

Engine Mechanical Overview

How Starting Works: The DME’s Logic

If your BMW starts and immediately stalls, the usual culprits are fuel pressure, the EWS/CAS immobilizer, the crankshaft sensor, or a clogged fuel filter.

Engine Mechanical ⚡ Express

BMW F80 M3: Full Breakdown of the S55 Engine, Problems, and Tuning

A complete guide to the BMW F80 M3: the S55 engine, common problems (crank hub, intercooler leaks, J-pipe, differential bushing), maintenance advice, a used-buyer checklist, and tuning potential. Find out whether the F80 M3 is worth buying in 2024.