Home Learn Learning tracks SELF-PACED PATHS Learn the system.Practice the method. Five guided paths organize the public knowledge library around real decisions. There is no paywall, no credential claim, and no requirement to surrender diagnostic data.
YOUR LOCAL PROGRESS Loading…
Stored only in this browser. No account or analytics event is required.
Lesson 01 Respond to a check-engine light Open lesson ↗ Lesson 02 Understand what a code proves Open lesson ↗ Lesson 03 Read code status Open lesson ↗ Lesson 04 Recognize a recently reset vehicle Open lesson ↗ Lesson 05 Verify the outcome Open lesson ↗ Knowledge check · 3 questions Why should freeze frame be saved before clearing? What is different about a permanent code? What evidence shows that the relevant monitor ran after repair? Explain the answer in evidence terms: observed fact, possible cause, decisive test, and remaining unknown.
Lesson 01 Reconstruct the failure scene Open lesson ↗ Lesson 02 Build a repeatable baseline Open lesson ↗ Lesson 03 Correlate fuel-control evidence Open lesson ↗ Lesson 04 Use onboard monitor results Open lesson ↗ Lesson 05 Rank and test hypotheses Open lesson ↗ Knowledge check · 3 questions Which operating conditions make a baseline comparable? Why can more requested PIDs reduce useful sample rate? When should a Mode $06 identifier remain unknown? Explain the answer in evidence terms: observed fact, possible cause, decisive test, and remaining unknown.
03 Owner + Professional · Intermediate
Hardware and access truth Understand the exact adapter, transport, license, gateway, profile, and authorization chain behind a capability claim.
Lesson 01 Choose the right iPhone transport Open lesson ↗ Lesson 02 Separate diagnostic layers Open lesson ↗ Lesson 03 Understand authorization Open lesson ↗ Knowledge check · 3 questions Why does connector access not imply all-module access? What makes a supported function exact? Why is KYC alone insufficient for an all-keys-lost workflow? Explain the answer in evidence terms: observed fact, possible cause, decisive test, and remaining unknown.
Lesson 01 Diagnose the low-voltage foundation Open lesson ↗ Lesson 02 Interpret traction-battery evidence Open lesson ↗ Lesson 03 Capture repeatable conditions Open lesson ↗ Knowledge check · 3 questions Why is state of charge not state of health? What evidence is needed for a capacity claim? Which observations require immediate high-voltage escalation? Explain the answer in evidence terms: observed fact, possible cause, decisive test, and remaining unknown.
Lesson 01 Run a pre-purchase evidence scan Open lesson ↗ Lesson 02 Preserve a disappearing fault Open lesson ↗ Lesson 03 Verify part identity before price Open lesson ↗ Lesson 04 Document the result Open lesson ↗ Knowledge check · 3 questions What can a clean scan not prove? Why should an exact brand and manufacturer part number anchor seller comparisons? What unknowns belong in a post-repair report? Explain the answer in evidence terms: observed fact, possible cause, decisive test, and remaining unknown.
FIELD COMPANION
Take the methodto the vehicle. Use printable evidence checklists to preserve the failure scene and hand off a cleaner record.
Open field checklists ↗ 