Guides
BMW Fault Codes by Engine: N52, N54, N55 and What to Expect
BMW fault codes explained by engine family. VANOS, HPFP, turbo, oil leak, and DME codes for N52, N54, N55 with EU repair costs and diagnostic tool options.
October 25, 2025
14 min
Topic Cluster: OBD2 Diagnostics
OBD2 Diagnostics and Fault Codes
Complete guide to OBD2 diagnostic codes. Learn what P0300, P0171, P0420, and other fault codes mean, how to diagnose them, repair costs, and when it's safe to drive.
All Posts in This Cluster
Guides
P0300 Code: What It Means & How Much It Costs to Fix (2025)
P0300 random misfire explained. Flashing check engine light? Stop driving. Causes, diagnosis order, and repair costs in euros.
August 5, 2025
10 min
Guides
EVAP Leak: Common Causes & How to Find It (P0442/P0456 Guide)
EVAP leak causing a check engine light? P0442, P0455, P0456 explained. Start with the gas cap. Causes, diagnosis, and repair costs in euros.
May 5, 2025
12 min
Guides
OBD2 Live Data: How to Read & Interpret Real-Time Parameters
Learn how to read and interpret OBD2 live data parameters like fuel trims, O2 sensors, and MAF to diagnose car problems faster.
April 15, 2025
15 min
Guides
P0171 Code: System Too Lean - Diagnosis & Repair Guide
P0171 explained: what system too lean means, the most common causes in order, how to diagnose with fuel trims, repair costs (€50 to €800), and when it's safe to drive.
February 20, 2025
13 min
Guides
What is OBD2? Complete Beginner's Guide to Car Diagnostics
Learn how OBD2 works, find the port in your car, understand diagnostic trouble codes, know which problems you can fix yourself, and when to see a mechanic.
February 10, 2025
14 min
Guides
P0420 Code: Catalyst Efficiency Below Threshold - Causes & Fix Cost
P0420 explained: what catalyst efficiency below threshold means, why it's not always the converter, diagnostic steps, repair costs (€150 to €2,500+), and when it's safe to keep driving.
January 20, 2025
14 min
Guides
Carly App Review 2025: Pricing, Features, and Honest Assessment
Honest Carly app review: coding features, pricing breakdown (adapter + subscription), BMW/Mercedes support, and how it compares to OBDeleven, BimmerCode, and Skanyx.
January 2, 2025
13 min
Guides
Best Car Diagnostic Tools 2026: What's Actually Worth Your Money
Compare the best car diagnostic tools for 2026. OBD2 scanners, apps, professional scan tools. Find the right tool for your needs and budget.
August 30, 2024
16 min
Guides
OBDeleven Review: Is It Worth It in 2026?
Honest OBDeleven review: VW Group coding features, updated 2026 pricing, and comparison with VCDS, Carly, BimmerCode, and Skanyx.
August 25, 2024
14 min
Guides
Best OBD2 Scanner Apps in 2026: An Honest Comparison
Best OBD2 apps for 2026: Torque Pro, OBDeleven, Carly, Skanyx, BlueDriver, Carista, and more compared. What each one does well and which fits you.
August 20, 2024
14 min
