Preheating - glow plug

Like many parts in your 4x4, the glow plugs need replacing after a while to prevent problems. Worn glow plugs can lead to issues such as hard or failed starts, increased fuel consumption, and engine malfunctions, particularly with 'post-heating' glow plugs. They can also cause excessive pollutant emissions, which is a common reason for failing an MOT. The life expectancy of glow plugs is generally around 120,000 kilometers, but this can vary depending on the brand, how frequently you start the vehicle, and the climate conditions. It's crucial to replace all the glow plugs at the same time, even if only one is failing, to maintain a balanced start-up across all cylinders in your 4x4.