1. Stop the engine immediately. Putting petrol in a diesel car can prevent it from starting, or in the worst case scenario, cause engine damage.
2. Don't turn on the ignition. Turning on the ignition could cause fuel to be pumped into the engine, potentially causing further damage.
3. Contact a professional. To avoid any further issues or safety hazards, it's best to contact a mechanic or automotive expert who can safely remove the petrol from the fuel system and resolve the issue. They may need to drain the fuel tank, flush the fuel lines, and replace the fuel filter.
4. Avoid starting the car. If you're unable to contact a professional immediately, don't attempt to start or move your car. Any attempt to start the engine could cause further damage to your car's engine and fuel system.
5. Have your car towed. If necessary, have your car towed to a mechanic or automotive repair shop where the problem can be professionally addressed.
Remember, it's important to act swiftly and avoid operating the car until the problem has been resolved to prevent any serious complications or damage.