About Engine Trouble Code

enginetroublecode.com is a free, independent reference for OBD-II diagnostic trouble codes (DTCs). Our goal is simple: help everyday drivers and professional technicians understand what their check engine light is trying to say — without unnecessary jargon or paywalls.

What We Cover

Every page on enginetroublecode.com is dedicated to a specific OBD-II DTC and explains:

• What the code means and which system it relates to.
• The most common causes and symptoms.
• Estimated repair costs at independent garages and dealerships.
• Step-by-step diagnostic and repair guidance.
• Vehicle-specific information for popular makes and models.

We cover all four OBD-II code families: Powertrain (P), Body (B), Chassis (C), and Network (U) codes.

Our Approach

OBD-II codes were standardised in 1996, but what triggers a code varies significantly between makes, models, and model years. We invest in vehicle-specific content so that a Ford Ka P0300 page gives you more relevant information than a generic P0300 page ever could.

All diagnostic and repair information is written with the understanding that codes describe symptoms, not necessarily root causes. We always encourage proper diagnosis before replacing parts — the most common and costly mistake vehicle owners make.

Disclaimer

The information on enginetroublecode.com is provided for educational and informational purposes only. It is not a substitute for professional mechanical advice. Repair procedures, costs, and symptoms vary by vehicle, region, and individual circumstance. Always consult a qualified technician and your vehicle's official service manual before carrying out repairs.

We are not affiliated with any vehicle manufacturer, parts retailer, or repair chain.

Contact & Feedback

Found an error? Want to suggest content for a specific vehicle or code? We welcome feedback from both drivers and technicians. Visit our Contact page to get in touch.