i40 fuel level sensor fault

Good evening. A fuel level sensor, as you likely know, measures the amount of fuel in the fuel tank and sends that information to the fuel gauge. Before delving deeper, could you please clarify if the fuel gauge reading is erratic or consistently inaccurate? Also, have you noticed any recent work done on the fuel system or any unusual smells, for instance, a strong gasoline smell, which could indicate a leak?

Thanks for the swift reply! The fuel gauge does jump around a bit, it's not steady. It will show half a tank, then suddenly drop to a quarter, then jump back up. As for recent work, nothing done recently at all. I also cannot smell any gasoline, so I don't think it's leaking.

Given the symptoms, and the fact that the fuel gauge reading is inconsistent, the fuel level sensor itself is the most probable cause of your issue. While checking fuses is a reasonable first step, the erratic gauge behavior points to a faulty sensor within the fuel tank. In such cases, it is advisable to have the vehicle inspected by a qualified technician. The error code and symptoms certainly suggest a sensor replacement may be required. Replacing the fuel level sensor typically costs around 52€.

Thanks so much for your help! I took it to the shop, and you were spot on. It was indeed the fuel level sensor, and the replacement cost was exactly what you predicted. Runs like a dream now!