OBD2 / CEL Code Lookup
Type a check-engine-light code to see a plain-language meaning, common causes, and basic DIY checks.
VIN decoder
Vehicle Lookup
Enter a 17-character VIN to decode year, make, model, engine, drivetrain, body style, fuel type, and recall path. If a VIN is not available, type year, make, model, and engine.
VINs do not use I, O, or Q. The decoder checks your local database first, then NHTSA.
2018 Ford F-150
- Engine
- 5.0L V8
- VIN
- 1FTFW1E50JFA12345
- Mileage
- 125,684 mi
Torque Specifications
Search the part or fastener you need, then open the closest torque match.
Fluid Specs
Pick a fluid and get type, capacity, interval, and fill warnings for the selected vehicle.
Recall Check
Use VIN basics and NHTSA direction to help owners find open safety recalls.
Battery Specs
Track voltage, group size reminders, charging notes, and no-start basics.
Repair Notes
Keep engine, drivetrain, mileage, and service notes together before starting a job.
Job Checklist
Pick a common repair and get parts, tools, safety checks, and mistakes to avoid.
Symptom Troubleshooter
Choose a common problem and get first checks before replacing parts.
Repair Cost Estimator
Compare DIY parts and tools against a typical shop price range.
Toolbox Builder
Build a starter tool list by DIY level and repair type.
Safety Checklist
Run a quick safety check before lifting, braking, cooling, fuel, or electrical work.
Parts Shopping List
Generate a parts-and-supplies list from a common DIY job.
DIY Risk Meter
See difficulty, safety risk, and when a job is better left to a shop.
Warning Light Guide
Pick a dash light and get urgency, first checks, and when to stop driving.
Torque Pattern Guide
Open common tightening patterns and torque reminders before assembly.
DIY Garage
Maintenance Schedule and Repair Log
Track common service reminders and save repair notes for the selected vehicle. Everything is stored locally in this browser.
Maintenance Schedule
Repair Log
Example Result
P0171 - System Too Lean Bank 1
The engine computer is adding extra fuel because bank 1 is reading lean. A DIYer should first check for vacuum leaks, loose intake hoses, and a dirty MAF sensor before replacing parts.
OBD-II Reference
Find Check Engine Light Codes by Category
OBD-II trouble codes usually begin with a letter that points to the vehicle system. Search a code, symptom, or system below, then open the full DIY diagnostic view.
Technician Mode
Search the OBD2 catalog before replacing parts
Use this as a quick reference for code family, likely system, first checks, tools, and related trouble codes.
P Codes - Powertrain
Powertrain codes cover engine, transmission, fuel, ignition, and emissions-related systems.
Common DIY Codes
How to Read a Code
PSystem family: P powertrain, B body, C chassis, U network.
00 is generic. 1, 2, or 3 can be manufacturer-defined.
1Subsystem range such as fuel, ignition, emissions, or transmission.
71Specific fault number. Confirm by exact vehicle before buying parts.