If your vehicle is running colder than normal then it can be a sign of a faulty thermostat (stuck open).
1️⃣ A cold running engine will be less efficient, so you will experience worse fuel econony ultimately costing you more at the pump ⛽
2️⃣ A cold running diesel engine if fitted with a DPF affects the regeneration process and if cold enough will hamper or in most cases disable regeneration 👀
Here we have a Honda Civic 1.6 diesel booked in with the DPF light recently on.
