How does the AI car diagnosis tool work?

You describe your car symptoms — such as engine noise, warning lights, or performance issues — select your vehicle make, model and year, and our AI instantly analyzes the most likely causes ranked by probability, along with repair costs and step-by-step DIY instructions.

Is the car diagnosis tool free?

Yes. WhatIsWrongWithMyCar.com is completely free. There are no subscriptions or hidden fees. You get full access to AI diagnosis, OBD2 code lookup, repair cost guides, and DIY repair instructions at no charge.

What car problems can the AI diagnose?

Our AI can diagnose over 100 common car problems including engine misfire, check engine light, transmission slipping, grinding brakes, car won't start, overheating, oil leaks, battery issues, suspension noise, and OBD2 fault codes like P0300, P0420, and P0171.

How accurate is the AI car diagnosis?

The AI is trained on automotive repair data and ranks causes by likelihood based on your specific symptoms and vehicle. For most common problems, accuracy is high. However, a professional mechanic inspection is always recommended for safety-critical repairs.

What causes site directory?

Common causes of site directory include worn components, sensor failures, fluid leaks, and electrical faults. Our guide above breaks down each cause with diagnosis steps and repair costs.

How much does it cost to fix site directory?

Repair costs for site directory vary depending on the root cause and whether you do it yourself or use a shop. Typical ranges are $50–$300 for minor fixes and $300–$2,500 for major repairs. See the cost breakdown in the guide above.

Can I fix site directory myself?

Many causes of site directory are DIY-friendly with basic hand tools, while others require specialized equipment. Check the DIY difficulty rating and step-by-step instructions in our guide to determine if it is a job you can tackle.

Is it safe to drive with site directory?

It depends on the severity. Some causes of site directory are safe to drive with temporarily, while others can cause further damage or safety risks. Always have the issue diagnosed promptly and consult a qualified mechanic for safety-critical repairs.

Site Directory: Every Guide and Tool on WhatIsWrongWithMyCar.com

Diagnostic Tools

Free AI Car Diagnosis Tool — enter your make, model, year, and symptoms for instant ranked causes, repair costs, and DIY guides. OBD2 Code Lookup — look up any P, B, C, or U code for causes, urgency, and repair costs. VIN Lookup — enter your 17-digit VIN to check NHTSA safety recalls. Repair Cost Calculator — estimate any repair cost with DIY and shop breakdowns. Compare Cars — compare any two vehicles for reliability, problems, and ownership costs.

Car Problem Guides

Browse 87 car problem guides organized by system: engine problems (misfire, overheating, oil leak, rough idle, stalling), brake problems (grinding, squealing, soft pedal, vibration), transmission problems (slipping, hard shifting, delayed engagement), electrical problems (battery, alternator, starter, warning lights), suspension problems (clunking, pulling, bouncing, wheel bearing), and cooling system problems (overheating, coolant leak, thermostat).

Resource Hubs

OBD2 Code Library — every common fault code explained. Car Repair Cost Guide — 20 repairs with DIY and shop prices. Tire Guide — sizing, buying, and maintenance. Preventive Maintenance Schedule — every service interval and cost. Used Car Buying Guide — inspection checklist and negotiation. Car Problems by State — regional failure patterns. Reliability Rankings — most and least reliable brands.

Reviewed by Vukašin Herbez — Automotive Editor · Last updated 2026-10-14