Observation before interpretation
We state what a controller, measurement, document, or physical inspection observed before discussing possible causes. A DTC never becomes an automatic parts verdict.
Trust is part of
the diagnostic chain.
This policy defines what a ScanWrench education page must show before it can guide a vehicle decision—and what it must never claim from incomplete evidence.
Exact scope
Generic emissions access, enhanced reads, commands, service operations, coding, security work, and programming are identified as different capability layers.
Unknown stays unknown
Unavailable modules, unverified definitions, missing units, uncertain scaling, insufficient sample rate, and incomplete operating conditions remain visible limitations.
Safety changes the answer
Fuel, hot, moving, braking, steering, restraint, lifting, electrical, and high-voltage risks receive stop, escalation, and exact-procedure boundaries.
Primary evidence wins
Exact current manufacturer information, applicable standards, official public agencies, preserved raw records, and controlled measurements take priority over summaries and anecdotes.
Commercial separation
Payment, sponsorship, affiliate economics, or vendor relationships cannot buy a diagnostic conclusion, compatibility state, omitted failure, or education ranking.
Scope and intent
Each page answers a real diagnostic or ownership question and declares whether it is general education, a standardized-code reference, or an exact application claim. We do not create make/model pages merely to capture search traffic.
Named accountability
ScanWrench Editorial is the library's working byline. Joshua Black, founder and publisher, is responsible for publication decisions, disclosure, and corrections. This named role does not imply an unlisted repair, engineering, manufacturer, or certification credential.
Review and dating
Pages marked reviewed are checked for internal consistency, capability boundaries, safety wording, and alignment with the current ScanWrench evidence model. Material changes update the visible review date.
Source hierarchy
Current exact manufacturer information comes first for a vehicle-specific procedure. Applicable standards, official regulators and public agencies, manufacturer communications, and preserved raw measurements follow. Retailer descriptions, forum posts, search summaries, and anecdotes can identify questions but cannot establish a safety-critical conclusion by themselves.
Software assistance
Drafting, organization, and quality checks may use software assistance. That does not create a verification claim. Exact technical, vehicle, legal, medical, financial, or safety-critical conclusions still require the appropriate authoritative source and qualified review.
Corrections and revision history
Send the URL, disputed statement, exact vehicle application when relevant, and supporting primary evidence through ScanWrench editorial. Material corrections change the page, review date, visible revision history, and any dependent diagnostic rule or product claim. Quiet typo and accessibility fixes may not receive a separate history entry when they do not change meaning.
Links and monetization
External links must help verify a definition, procedure, part identity, hardware requirement, or official program. Retail price comparisons begin only after exact product identity is established. Sponsored placement cannot control ranking or evidence.
Review labels
“Reviewed” is a ScanWrench process claim: scope, safety language, source fit, and evidence boundaries were checked on the displayed date. It is not a vehicle inspection, professional license, ASE certification, OEM authorization, or promise that a page covers every market or model year.
LAST REVIEWED JULY 15, 2026
Questions, corrections, and missing educational topics are welcome.