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Vehicle diagnostics knowledge & tools

Vehicle diagnostics knowledge and professional tools

Diagnose the fault. Verify the cause. Choose the right tool.

Search fault codes, understand real-world symptoms, follow practical diagnostic procedures and choose tools by the capability the job actually requires.

Popular searches:P0171DPFRough idleBMW scanner
Professional OBD2 scanner displaying live vehicle data
Fault codesLive dataDiagnostic testing
Fault CodesMeaning, causes and diagnostic contextCommon ProblemsStart from symptoms and real-world behaviourDiagnostic ProceduresStep-by-step testing and data interpretationDiagnostic ToolsFind the capability the job requires
Featured diagnostic knowledge

From scanner data to a verified cause

Use fault codes, live data and practical tests together instead of treating any single reading as the diagnosis.

Key OBD2 live data PIDs
Diagnostic procedure

How to Read OBD2 Live Data

Learn which PIDs matter, how related values should be compared and how live data turns a fault code into evidence.

Read the guide
Fuel trims explained
Fuel control

Fuel Trims Explained

Use STFT and LTFT patterns to separate likely causes.

Read guide
Freeze frame data
Fault evidence

Freeze Frame Data

See the operating conditions when the fault was detected.

Read guide
Bidirectional tests
Advanced diagnostics

Bidirectional Tests

Command supported actuators and verify system response.

Read guide

Not sure where to start?

Start with the fault code or symptom you already have and follow the evidence from there.

Explore common problems
Diagnostic tools

Choose tools by diagnostic capability

Vehicle coverage, control-unit access and diagnostic functions matter more than the length of a feature list.

Single-brand diagnostic scanner
For owners & brand specialists

Single-brand diagnostic tools

Focused access for users working mainly with one vehicle brand.

View tools
Multi-brand diagnostic scanner
For enthusiasts & mixed fleets

Multi-brand OBD scanners

Broader vehicle coverage with deeper diagnostics and service functions.

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Professional diagnostic tool
For workshops & professionals

Professional diagnostic tools

Advanced system access, service functions and wide vehicle coverage.

View tools
Diagnostic platforms

Established platforms for different workflows

Compare the platform that best fits how you diagnose vehicles rather than choosing by brand name alone.

Launch X-431

Professional multi-brand diagnostic platforms for workshops and demanding diagnostic work.

Compare Launch

iCarsoft

Brand-specific and multi-brand standalone scanners with dedicated hardware.

Compare iCarsoft

OBDeleven

Compact app-based diagnostics with deeper vehicle-specific functions on supported vehicles.

Explore OBDeleven
Selected diagnostic tools

Selected diagnostic tools

A curated selection covering professional, multi-brand, app-based and single-brand diagnostics.

The OBD Europe standard

Good diagnostics require better evidence, not faster guesses.

Independent information, practical guidance and professional tools should lead toward the same outcome: understanding the fault before replacing parts.

Accuracy before speedVerified technical information over generic advice.
Diagnose before replacingConfirm the cause before changing parts.
Explain, don’t just defineConnect codes, symptoms, tests and tools.
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