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Our guides
Free - written by our technicians
Explore our guides
Everything you need to know about car diagnostics, without the jargon: understand OBD, identify a warning light, read a fault code, choose a scanner and carry out your own repairs where possible.
In-depth guides
Five guides answering our customers' most common questions. New to diagnostics? Start here.
What is OBD?
The standard, implementation dates, the check engine light, the connector and the 10 diagnostic modes.
Where is the OBD port?
Find its location by vehicle make, with photos shared by our community.
OBD fault codes
How to read a code, plus a list of generic fault codes explained in English.
Repair tutorials
Real faults diagnosed from start to finish by our engineers, with supporting measurements.
ELM327 and OBD2
Bluetooth, Wi-Fi and USB: how they work, how to spot a clone and how to test your adapter.
Looking for an OBD scanner?
Our guides are free, and our scanners are made in France. Read and clear fault codes with klavkarr and the EOBD Facile app, with no subscription.
In the press
