ScanWrench: OBD2 Scanner

ScanWrench turns a compatible OBD2 adapter into an evidence-first vehicle diagnostic workflow for Android.

Read supported check-engine codes in plain language, preserve the failure scene, and see the cheapest useful test to run next. ScanWrench keeps vehicle evidence, possible causes, unknowns, and repair verification separate so one code does not become an automatic parts verdict.

SCAN YOUR VEHICLE
• Read supported current, pending, and permanent OBD2 codes
• Capture available freeze frame, readiness monitors, protocol, voltage, and live-data context
• Keep unavailable modules and unsupported functions labeled not checked

SEE THE EVIDENCE
ScanWrench records what the vehicle and adapter actually returned, including code status, reporting system, connection path, and evidence gaps. A ScanReceipt helps preserve the session for a second opinion or before-and-after comparison.

CHOOSE THE NEXT USEFUL TEST
Review evidence-supported cause branches and a cheapest-first test order. ScanWrench does not claim that a code proves a failed component, repair price, or safety outcome.

COMPARE BEFORE AND AFTER
Preserve the original scan, document what changed, and repeat the relevant conditions safely. Clearing codes alone is not repair verification.

CHECK A USED VEHICLE
Buyer Challenge creates a fresh, time-bound scan record with supported fault memory, readiness, reset clues, voltage, and unavailable coverage. It supplements—not replaces—a qualified mechanical, structural, title, and safety inspection.

BRING A COMPATIBLE ADAPTER
ScanWrench works with compatible customer-supplied OBD2 adapters. On Android, the app can evaluate BLE, Wi-Fi, and supported Bluetooth Classic candidates. Exact support depends on the phone, adapter, firmware, transport, vehicle, module, and requested function.

CONTROL YOUR DATA
Use ScanWrench without a required account. Choose Device Only for supported local records or Save Nothing to discard the session. Optional account features are separated from the device-local scan path.

KNOW THE COVERAGE
Generic emissions OBD2, manufacturer-enhanced data, full-system access, and state-changing functions are different capability levels. ScanWrench reports only observed support for the exact setup and keeps missing evidence visible.

FREE PATH
ScanWrench Free includes one vehicle, three complete evidence scans each month, up to 10 saved sessions, adapter preflight, standard code reading, live-data preview, and a ScanReceipt summary. Paid offers appear only when Google Play returns a verified storefront offer.

SAFETY
Operate only when parked or when the phone is securely mounted and local law permits. Do not use ScanWrench as a substitute for official service information, a qualified inspection, or emergency judgment. Stop for flashing warning lights, severe drivability changes, fuel odor, overheating, smoke, brake or steering changes, or any unsafe condition.