25/02/2026
Alot of people think diagnostics is “plug in and read the code”.
I wish it was as easy as that !?
Diagnostics is evidence gathering.
Then making a decision you can stand behind.
Where some workshops go wrong is usually one of two places:
🅰️ Too shallow
They stop at basic OBD.
Useful, yes, but it’s mainly emissions-based information.
It’ll point at a symptom, not confirm a fix.
🅱️ Too confident
They treat a fault code like a diagnosis.
A decent technician never fits a part based only on a code.
Codes are a starting point. Proof comes from live data, qualifying the fault, and testing.
Real diagnostics is the full flow:
Interrogate the customer → recreate the fault → plug in, read and confirm codes → check live data → qualify the fault (and scope it if needed) → repair, code or reset if required ,
Test the vehicle 🚑
intermittent faults are hard to recreate in some areas and don't always show 🎇
And the tool matters because capability changes the job:
Multibrand aftermarket (to a certain level) → OEM for full coverage, accurate descriptions, correct live data, and coding and programming ..
One more term you’ll keep hearing: secure gateway.🚷
That’s manufacturers locking down access. 👾👾👾👾👾👾👾👾👾👾👾👾
