Replace Toyota Prius Ignition Plug & Toyota Prius Spark Plugs. Order Toyota Prius Ignition Plug Wires. Find Best Toyota Prius Combustion Plugs. Maintaining the spark plugs in your Toyota Prius is crucial for optimal performance and fuel efficiency. To extend their lifespan, ensure your engine is tuned and the spark plug gap is set correctly. Signs that indicate a replacement is needed include difficulty starting the car, engine misfires, or a noticeable decline in mileage. When choosing new spark plugs, opt for iridium or platinum types for their longevity and superior performance. Remember, using OEM (Original Equipment Manufacturer) spark plugs can guarantee a perfect fit and trouble-free installation, making them a wise investment for your Prius. Shop with us for reliable spark plug options and keep your hybrid running smoothly.