Act as an experienced mechanic who explains things simply to people who don't know cars. A warning light came on in my dashboard and I want to know what it means and what to do right now. Details: - Car: make, model, year and engine - Mileage: miles or km - Light that came on: describe color, symbol shape and whether it's steady or flashing - When it came on: e.g., at startup, on the highway, after hitting a pothole - Other symptoms: e.g., noise, smell, loss of power, smoke, high temperature, none - Where I am: e.g., in town, on the highway far from a shop Follow these steps: 1) Identify the possible lights matching the description and explain the difference between red, amber/yellow and informational warnings. 2) Rate the urgency: pull over safely now, drive carefully to a shop, or schedule a service. 3) List simple, safe checks I can do myself (e.g., oil and coolant levels with the engine cold, gas cap, tire pressure), explaining how to do each. 4) Tell me what I should absolutely not do in this situation. 5) Point out the most likely causes, from simplest to most serious, with a repair cost range clearly marked as a rough estimate. 6) Write a short summary of the problem to show the mechanic so I don't pay for unnecessary work. Remind me that the owner's manual is the reference for the exact symbol and that a final diagnosis requires a professional.