Guides
Used Nissan Leaf: Battery Bars, SOH and Common Faults
Twelve battery health bars, the LeafSpy SOH number, and the four faults that kill resale on a used Leaf. What to check before paying 5,000 to 22,000 euros.
May 9, 2026
10 min
Topic Cluster: Vehicle Maintenance
Vehicle Maintenance and Health
Complete guide to vehicle maintenance, seasonal care, health score monitoring, and preventive maintenance. Keep your car running smoothly year-round.
All Posts in This Cluster
Guides
Used BMW i3 Buyer's Guide: Battery Health and Range Check
Three battery generations, REX quirks, and four OBD2 checks that separate a healthy used BMW i3 from a tired one. Before you pay 8,000 to 28,000 euros.
May 6, 2026
10 min
Guides
Tesla BMS Error Codes: A Used Buyer's Decoding Guide
BMS_w015, BMS_a067, BMS_u029 and the rest. What each alert means on a used Model 3, S or Y. Range loss patterns and the four codes that mean walk away.
May 2, 2026
10 min
Guides
EGR Delete Detection: What OBD2 Will (And Won't) Show on a Used Diesel
EGR deletion is the hardest of the three diesel emissions cheats to detect with OBD2. Here is what the scan tool reveals, what it cannot, and three physical checks that close the gap.
April 23, 2026
9 min
Guides
Rough Idle: Causes, Diagnosis, and How to Fix It
Your engine shakes, vibrates, or hunts at idle. Rough idle has a handful of common causes that range from a 10-euro fix to a serious engine issue. Here is how to narrow it down systematically.
March 18, 2026
5 min
Guides
Car Overheating: Causes, What to Do, and Repair Costs
Your temperature gauge is climbing into the red. Here is exactly what to do in the next 60 seconds, what causes overheating, and how much each repair costs. Acting fast prevents thousands in engine damage.
March 18, 2026
6 min
Guides
Car Won't Start: Complete Troubleshooting Checklist
Your car won't start. Before you call a tow truck, work through this systematic checklist. Most no-start conditions are caused by a handful of common problems you can diagnose in your driveway.
March 17, 2026
9 min
Guides
Year-Round Car Maintenance: Complete Seasonal Guide
Seasonal car maintenance organized by system - battery, cooling, tires, brakes, fluids. What to check and when, so nothing gets missed.
November 15, 2025
14 min
Technology
EV Diagnostics: What Your Scanner Can (and Can't) Tell You
Your OBD-II scanner works great on petrol cars, then you plug it into an EV and get almost nothing. Here's what actually works.
October 10, 2025
12 min
Tips & Tricks
DIY Car Repairs for Beginners: Safe & Easy Maintenance
Learn which car repairs you can safely DIY, which ones will cost you more if you try, and what EU shops actually charge.
October 1, 2025
16 min
Guides
MAF Sensor Cleaning: Step-by-Step DIY Guide (2026)
Clean your MAF sensor in 15 minutes for under €10. Step-by-step guide with OBD2 verification to fix hesitation, rough idle, and poor fuel economy.
April 25, 2025
12 min
Guides
Best Professional Diagnostic Scanners 2026: Multi-Brand Repair Shop Buying Guide
Professional diagnostic scanners for 2026 repair shops: Autel, Launch, Snap-on, Topdon, Foxwell compared with EUR pricing, annual subscription costs, and 5-year TCO. Multi-brand coverage for independent technicians and dealer-specialty shops.
March 1, 2025
16 min
Guides
Car Won't Start? Complete Troubleshooting Checklist
Systematic checklist for diagnosing a car that won't start. Covers battery, starter, alternator, fuel system, sensors, and immobiliser issues with OBD2 diagnostics throughout.
February 25, 2025
14 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
15 Common Car Problems: Symptoms, Diagnosis, and Repair Costs
The 15 most common car problems explained: symptoms, diagnostic steps, DIY vs mechanic guidance, and cost estimates in EUR.
January 10, 2025
17 min