That's a funny question, the answer is; all of them! Among the most frequent issues is the dreaded 'check engine' light, which can signal anything from minor sensor glitches to more serious malfunctions like misfires or emissions problems. Another common concern is engine misfires, where one or more cylinders fail to ignite properly. Overheating, excessive engine oil consumption (or oil dilution) are also common. Since the introduction of small petrol turbo engines, we spend a lot of time writing about timing chain problems like stretching, skipping and the costs of replacement. We deal with a lot of issues related to engine carbon deposits, blocked DPF filters, Adblue problems and other diesel fun stuff as we call it. These common engine problems can be daunting, but with the right diagnosis and timely repairs, you can keep your car running smoothly and avoid more extensive damage.