About This Page
This index covers every common vehicle problem organized alphabetically and by system. Each problem page provides root causes ranked by probability, associated OBD2 fault codes, a step-by-step diagnostic procedure, and realistic repair cost estimates for both DIY and professional shop repair. Use the AI diagnosis tool for a vehicle-specific result tailored to your exact make, model, year, and symptoms — or browse the index below to find a guide for your specific problem.
Engine: misfire (P0300–P0308), rough idle, overheating, oil leaks, stalling, low oil pressure. Brakes: grinding, squealing, soft pedal, vibration, pulling. Transmission: slipping, delayed engagement, hard shifting, shudder, no-drive. Electrical: battery dies, alternator failure, car won't start, check engine light. Suspension and steering: clunking, bouncing, pulling, wheel bearing noise, shimmy. Cooling system: overheating, coolant leak, thermostat failure.
Reviewed by Vukašin Herbez — Automotive Editor · Last updated 2026-09-20