Hello! What can be the general reason why a petrol engine (4-cylinder, MPI) has already broken the spark plug twice with the same cylinder? The last time it happened just under 15,000 km ago, now again. Photos from the last time are included. Current photos of this time I am enough. The candle then and today look very similar from the damage picture anyway. By the way, the three candles looked or look good. (P0300, P0304) and the engine was in the emergency run. What should you do now? Simply install new candles, delete errors and continue driving? Thank you for your answers and advice!