Car diagnostic codes – what they mean and how to deal with them

Decoding OBD-II diagnostic trouble codes

Understanding fault codes is an important part of vehicle maintenance. Our full list will help you interpret the codes so you can troubleshoot your car yourself.
Search your trouble code
Search your trouble code
List of the most common DTC codes – find the meaning and learn how to solve the problem

Top 50 fault codes

View the full list of codes
The ECU fault code can tell you exactly what problem your vehicle has

Most viewed car repair videos

  • How to easily read and clear your car’s OBD II codes
    How to change front wheel bearing on MERCEDES-BENZ M W163 TUTORIAL | AUTODOC
    149K views
    Published on: 09/11/2016
  • How to easily read and clear your car’s OBD II codes
    How to change fuel filter BMW 3 (E90) [TUTORIAL AUTODOC]
    231K views
    Published on: 17/04/2019
  • How to easily read and clear your car’s OBD II codes
    How to change Front wheel bearing on VW GOLF 4 TUTORIAL | AUTODOC
    174K views
    Published on: 24/10/2016
  • How to easily read and clear your car’s OBD II codes
    How to change a rear brake pads FORD FOCUS 3 TUTORIAL | AUTODOC
    168K views
    Published on: 28/03/2016
  • How to easily read and clear your car’s OBD II codes
    How to change pollen filter / cabin filter on AUDI A6 (C6) [TUTORIAL AUTODOC]
    145K views
    Published on: 25/10/2019
  • How to easily read and clear your car’s OBD II codes
    How to change engine thermostat on PEUGEOT 207 [TUTORIAL AUTODOC]
    136K views
    Published on: 09/12/2020
  • How to easily read and clear your car’s OBD II codes
    How to change fuel filter NISSAN X-TRAIL T30 TUTORIAL | AUTODOC
    135K views
    Published on: 22/01/2018
  • How to easily read and clear your car’s OBD II codes
    How to change front wheel bearing TOYOTA YARIS XP10 TUTORIAL | AUTODOC
    118K views
    Published on: 05/09/2017
The ECU fault code can tell you exactly what problem your vehicle has

Best online car repair guides

Want to get more useful information?

Ask questions or share your repair experience on the car forum. Subscribe to updates so you don't miss out on new guides.

Ask on the forum
Everything you need to know about DTC codes
Tips from AUTODOC CLUB
View more
  • Life hacks for engine fault codes
    Why Is the Windscreen Washer Not Spraying? Solution
    3K views
    Published on: 25/04/2025
  • Fast fixes for OBD2 codes
    Don’t Replace, Just Polish! Headlight Restoration with AUTODOC
    9K views
    Published on: 13/01/2021
  • List of the main fault codes
    5 Essential Tips to Prepare Your Car for Winter | AUTODOC tips
    6K views
    Published on: 05/02/2024
  • Quick tips for OBD2 codes
    Why Checking Your Oil is Crucial for Engine Performance
    6K views
    Published on: 23/02/2023
Unlock your car maintenance assistant!

Track expenses, manage logs, schedule replacements, and more.

AUTODOC CLUB Manuals Catalogue

Repair and replacement manuals

Autodoc CLUB App icon
Time to replace parts? Get even better deals in our Shop app.
QR-code scan for AUTODOC CLUB app
SCAN ME