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OBDSale.com helps drivers, DIY repairers, and mechanics compare OBD2 scanners, Bluetooth adapters, and diagnostic tools for real vehicle problems. Explore buyer guides for Ford, Toyota, BMW, diesel vehicles, trucks, and everyday check-engine-light troubleshooting.

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Whether you need a simple code reader, a Bluetooth OBD2 adapter, or a professional scan tool with advanced system coverage, our guides explain what to look for, which features matter, and how to choose the right diagnostic tool for your vehicle.

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OBD2 Code Lookup — What Does Your Code Mean?

Search 150+ diagnostic trouble codes by code or keyword. Filter by make — BMW, Toyota, Ford, Cummins & more — and see which scanner diagnoses it properly.

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OBD2 scanner plugged into Honda Civic diagnostic port with check engine light on
Honda P1457 Code: EVAP System Leak (Canister Side) — Causes and Fixes
A P1457 code ('EVAP Control System Leak Detected — Canister Side') is the close cousin of P1456 (fuel tank side).
OBD2 scanner live data screen showing fuel trim, RPM, and O2 sensor graphs
Nissan P0101 Code: MAF Sensor Problem — Causes, Cleaning, and Fixes (Altima, Sentra, Rogue, Maxima)
A P0101 code ('Mass or Volume Air Flow Circuit Range/Performance Problem') is one of the single most commonly searched diagnostic
Subaru P0171 Code: System Too Lean (Bank 1) — Intake Gasket and Other Causes
A P0171 code ('System Too Lean, Bank 1') is one of the most common codes on Subaru's boxer engines, and
OBD2 scanner plugged into Honda Civic diagnostic port with check engine light on
Honda P0171 Code: System Too Lean (Bank 1) — Causes and Fixes by Engine
A P0171 code ('System Too Lean, Bank 1') on a Honda means the engine control module is seeing more oxygen
Basic OBD2 code reader vs full-featured OBD2 scanner comparison
Nissan P0300 Code: Random/Multiple Cylinder Misfire — Causes and Fixes by Engine
A P0300 code ('Random/Multiple Cylinder Misfire Detected') on a Nissan almost always points to one of a small handful of
Plugging an OBD2 scanner into a Toyota diagnostic port with check engine light on
Jeep, Dodge & Chrysler P0128 Code: Thermostat Stuck Open — Causes and Fixes by Engine
If your Jeep, Dodge, Chrysler, or Ram is throwing a P0128 code ('Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)'),
OBD2 scanner plugged into Honda Civic diagnostic port with check engine light on
Honda P0301 Code: Cylinder 1 Misfire — Causes, Diagnosis, and Fixes
What Is the P0301 Code on a Honda?The P0301 code means the ECM has detected a misfire specifically in cylinder
OBD2 scanner plugged into Honda Civic diagnostic port with check engine light on
Honda P0420 Code: Catalyst System Efficiency — Causes, VCM Notes, and Acura Fixes
What Is the P0420 Code on a Honda or Acura?The P0420 code means the ECM has determined that the catalytic
OBD2 scanner plugged into Honda Civic diagnostic port with check engine light on
Honda Civic P0128 Code: Thermostat Stuck Open — Causes, Fixes, and Affected Generations
What Is the P0128 Code on a Honda Civic?The P0128 code means the Engine Control Module (ECM) expected the engine
OBD2 scanner plugged into Honda Civic diagnostic port with check engine light on
Honda P1456 Code: EVAP System Leak (Fuel Tank Side) — Causes, Fixes, and Affected Models
What Is the P1456 Code on a Honda?The P1456 code is a Honda/Acura-specific (manufacturer "P1" series) trouble code that means