Why it helps
Gives the mechanic an ordered work list instead of a generic code definition, so the most likely and most serious causes are checked first.
The diagnosis gives you a ranked list of possible causes for this exact vehicle. Each cause is marked with a severity: High, Medium or Low.
Expand a cause to see its description, suggested tests, common symptoms, related systems and related components. Tabs for Videos and TSBs sit next to the overview. Causes with lower relevance are folded away behind 'Show N of lower relevance', so the most likely and most serious ones come first.
How to
- Run a diagnostic
- In Possible causes (Möjliga orsaker) click a cause to expand it
- Use the tabs Overview (Översikt), Videos (Videor), TSBs (TSB:er)
Good to know
- Probabilities are given per cause and do not add up to 100%.
- Measurements in the causes are AI-estimated unless your plan or vehicle unlock gives OEM-verified values. Estimated values are marked 'AI-estimated values'.
- Unrelated fault codes are analysed separately and only grouped when they plausibly share a system.
- Answers follow your app language. Units are imperial for the US and UK and metric elsewhere.
- Free plan: 1 diagnosis per day.
Related questions
What is WrenchLane?
WrenchLane is an AI diagnostic and repair assistant for car workshops. You choose the car, describe the problem or enter the fault codes, and get possible causes ranked for that exact vehicle, with checks to run, a repair guide and invoice text. It works in the browser and in the WrenchLane apps for iPhone, iPad and Android.
Learn more: Diagnostic (vehicle-first start), Possible causes ranked by probability and severity, WrenchLane app for iPhone, iPad and Android
What do I get back from a diagnosis?
A list of possible causes for that exact vehicle, ranked, each marked with severity High, Medium or Low. Open a cause to see its description, suggested tests, common symptoms, related systems and components, plus Videos and TSBs tabs.
Learn more: Possible causes ranked by probability and severity, Repair videos and TSBs per cause
Why don't the cause probabilities add up to 100%?
Each probability is the likelihood of that one cause on its own. Several causes can be likely at the same time, so the numbers are not shares of a whole.
Learn more: Possible causes ranked by probability and severity
Where is the AI analysis processed?
Since 15 September 2026 diagnoses run on an AI model processed in the EU.
Learn more: Possible causes ranked by probability and severity
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