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OBD-II DTC decoder. Enter P0300/P0420 etc. for official definitions, DIY troubleshooting, and compatible parts. 9,400+ standard codes.
SAE J2012 Standard · P/B/C/U Full Range
Enter DTC Code or Keywords
OBD-II DTC database with 9,417 SAE J2012 standard codes, covering P/B/C/U full range.
Hot DTC Codes Quick View
SAE J2012 Standard
Don't Panic — The check engine light can mean anything from a loose gas cap to a failing O2 sensor.
Step One — Use an OBD-II scanner to read the DTC code. Enter it in this tool. Most repair shops read codes for free.
Step Two — Based on the DTC code, decide if it's safe to drive. Issues involving safety systems (ABS, airbag, steering) need immediate repair.
Step Three — Find matching parts on motuon.com. Most sensors, spark plugs, ignition coils, etc. can be replaced DIY.
⚠ Disclaimer: This tool is for reference only. For serious faults, contact a professional repair shop. Data based on SAE J2012 standards. Manufacturer-specific codes may differ.
Oxygen sensors · Spark plugs · Ignition coils · Thermostats — Full range available