Hold the Light surfaces the right information at the right moment, so the technician stays the one who decides. Investigate faults by code, symptom or description — and always get the next logical step.
P0299 + “power loss uphill”
Check the condition of the boost pipes.
Other paths
The app suggests. The technician chooses. The app reorganises the investigation.
How it works
Hold the Light organises information, finds relationships between symptoms and codes, and follows the investigation from start to finish.
By VIN, plate, manual selection or optional OBD link. The investigation starts in seconds.
Type whatever you want — P0299, “white smoke”, “won't start when hot”. The app interprets and cross-references sources.
It combines probability, time and effort to suggest the check with the highest diagnostic payoff.
Pick another path, go back, ask for a different explanation. The investigation reorganises itself, no judgement.
Diagnostic Payoff Engine
The algorithm weighs probability, time, ease and diagnostic value. The goal is simple: maximum progress, minimum effort.
Example — suggested ordering
The chosen one offers the best balance between high probability and speed.
Features
Every code with meaning, causes, symptoms, tests, fixes and similar cases — organised, not buried in text.
One single box. Codes, symptoms, descriptions, combinations. The app interprets what you type.
Every test run, every result, every change of hypothesis is logged. You never lose the thread.
DTCs, live data, active tests, regenerations — whenever you want. The app also works with no hardware at all.
The app doesn't dump 30 videos on you. It picks the ones that best explain, show and solve.
If it doesn't click, the app explains it another way — text, diagram, video, example. Never "already explained".
Pricing
Start free. Move to Pro when you need it. Scale to the whole workshop when it makes sense.
To try the app with one vehicle per day.
Unlimited use for individual technicians.
For workshops — run the daily flow and share knowledge.
Individual accounts allow only one active device at a time. A new sign-in automatically ends the previous session.
FAQ
No. The app suggests. The technician chooses. Then it adapts to the technician's decision — never the other way around.
No. The app works fully without any hardware. If you connect an OBD adapter, extra features become available such as DTCs, live data, active tests and regenerations.
It's the engine that ranks hypotheses by combining probability, time, effort and diagnostic value. The goal is the check with the highest payoff — not simply the most likely cause.
Always. You can go back, explore another component, return. The investigation reorganises automatically. The app never blocks a path, except in safety-critical situations.