NicolasTechnician
“I have the fault codes… where do I start?”
Automotive diagnostic assistance
When a fault occurs, never start from scratch again.
Diagolia helps you interpret faults, understand the failure and know what to check first.
3 free diagnosticsThe technician makes the final decision
ClaireWorkshop manager
“Do these faults come from the same failure?”
MehdiElectrical technician
“What should I check before replacing a part?”
Watch the overview
Meet Diagolia in 33 seconds.
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Read the transcript
A warning light comes on. Not sure where to start? With Diagolia, move forward with confidence.
Enter your vehicle, describe the problem, and add your fault codes.
Diagolia looks at the context, suggests possible causes, and explains what to check.
Follow the guide, step by step. Share what you find, and the next steps adapt to your results.
Work through the problem with a clear method, while keeping the final decision in your hands.
Diagolia. Your automotive diagnostic assistant. Try it for free at diagolia.com.
The challenge
The scan tool reads the faults. Diagolia helps you understand the failure.
Diagolia cross-checks the codes, vehicle and symptoms to show you where to start without mixing different faults.
The same case, simplified
Peugeot 2008 II · 131,892 kmCodes entered
P16D0P208EP20A2P20E8P15A0
Context
Engine warning · 5 faults recorded together5DTC
Code-by-code reading
Five codes point to several components, with no clear order for the checks.
Read separately, they mix AdBlue, oil pressure and flywheel issues.
In the workshopIt is difficult to know where to start
3systems
Organized reading
Diagolia separates the five codes into three systems to investigate.
The AdBlue/SCR branch contains three codes; the other two remain separate to avoid false connections.
Resulting view
- AdBlue/SCR · 3 codes
- Oil pressure · 1 code
- Flywheel · 1 code
How it works
Five fault codes. One clear reading.
Diagolia organizes your DTC codes, explains the leads and shows what to check first.
Step 01 · Case input
Technical context structuredGather the useful information
The same real case will be followed through all four steps.
Vehicle
PEUGEOT 2008 IIRecognized
Fault codes
P16D0P208EP20A2P20E8P15A0
Workshop signal
Engine warning with several faults recorded together.
Context
131,892 km · diagnosis in progress
Step 02 · Source cross-check
5 inputs connectedConnect each code to the right sources
Diagolia keeps the origin of every piece of information visible.
Diagolia analysis2008 II · 131,892 km
Signals connected5 codes grouped into 3 systems
Step 03 · Ranked leads
AdBlue/SCRPossible causes
Grouped by system and priority, with each lead still to be confirmed on the vehicle.
AdBlue/SCR
P208EP20A2P20E8
Priority lead
Engine software update to check
For P208E, the documentation recommends first checking whether an engine control unit update is available.
Why this lead
The P208E documentation specifically asks for an available engine software update to be checked first.
To confirm on the vehicle
P20A2 and P20E8 may still have another cause in the AdBlue circuit.
Items concerned
Engine softwareInstalled version
- 1Check whether an engine update is available
Compare the installed version with the latest available version.
- 2Check the result after resetting the system
See whether the AdBlue faults return after the corrective action.
Sources supporting this lead
DocumentationP208E calls for checking whether an update is available.
LimitP20A2 and P20E8 still require other checks.
Step 04 · First check
To checkFirst useful check
A clear action before replacing any part.
1 of 4
Check whether an engine update is available
For P208E, the documentation recommends starting with the engine software.
Do this nowCompare the installed version with the latest available version.
WhereEngine software
Result recorded · next step adapted
Pricing
Start with 3 free diagnostics.
Choose based on your monthly volume and number of users.
1 credit = 1 diagnosticDiscovery
The Free plan to discover Diagolia on your first cases.€0
Try for free 3free standard diagnostics
| Feature | Free | Subscription |
|---|---|---|
| Guided diagnostic | 1 free per account | Unlimited on accessible diagnostics |
| AI messages per diagnostic | 10 | 50 |
| Web searches in the conversation | 0 | 10 |
| Photos per diagnostic | 0 | 5 |
| Vehicle information | Limited | Complete, subject to availability |
Message, web search and photo limits apply per diagnostic.
Plus
€29.99/ month
20diagnostics / month
1 user
Choose PlusMost popular
Workshop
€69.99/ month
50diagnostics / month
1 user
Start with WorkshopWorkshop Pro
€199.99/ month
150diagnostics / month
Up to 3 users
Choose Workshop Pro5-credit pack: €7 · No subscription required
Take the next step
Ready to diagnose with more confidence?
Create your account and start your first 3 diagnostics for free.
Try Diagolia for free 3 free diagnostics · No credit card requiredHow much time could you save?
- Time saved
- 21 h
- Value of this time
- €1,890excl. VAT
Assumption: 30 min saved per diagnostic.
Try for free
3 free diagnostics · No credit card required
FAQ
What to know before getting started.
Diagolia assists the diagnostic process; it replaces neither the scan tool nor the technician’s validation.
Does Diagolia replace the technician?+
No. It brings case information together, cross-checks sources and ranks possible causes. Checks and the final decision remain with the professional.
Does Diagolia identify the fault with certainty?+
No. Causes are ranked by plausibility and must then be confirmed through physical checks before any intervention.
What information can Diagolia cross-check?+
Fault codes, symptoms, measurements, technical documentation, web research, field cases and added photos, depending on the plan and available information.
Do I need a diagnostic scan tool?+
It is recommended. Diagolia uses the codes, measurements and observations already recorded; it complements the scan tool without replacing it.
What does the Free (Discovery) plan include?+
Three free credits to launch three standard diagnostics. One guided diagnostic is included per account. Each diagnostic includes 10 AI messages, with no web searches in the conversation or photo uploads. Vehicle information is limited.
Is it suitable for independent workshops?+
Yes. Diagolia is designed for workshops, technicians and diagnosticians, especially for complex faults, ambiguous codes and intermittent cases.
Can I use it with different vehicles?+
Yes. Credit volume and some features depend on the selected plan.
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