From fault code to evidence
The light is a clue.
Not the diagnosis.
Straightforward workshop guidance for warning lights, intermittent faults, non-starts and repairs that have not solved the complaint.
Start with the symptom
What is the vehicle
actually doing?
Choose the situation that sounds closest. Each guide explains what the evidence may mean, what to preserve and why the next test matters more than the next guess.
Warning light returned after repair
Why an engine warning light can return after parts have been fitted, and how evidence-led vehicle diagnostics finds the next sensible test.
Fault-code scan versus diagnostics
Understand what a fault-code scan tells you, what it cannot prove and what proper vehicle diagnostics adds before parts are replaced.
Intermittent faults that come and go
How intermittent electrical, network and running faults are monitored and tested when the vehicle behaves normally at the workshop.
Non-start with a good battery
A practical explanation of starter, power-supply, immobiliser, network and engine-management checks when a car will not start.
The named part was replaced—but failed
Why replacing the component named in a fault code may not cure a vehicle, and how systematic testing avoids another guess.
Fault still unresolved?