How to Replace the Coolant Level Sensor on the Discovery Sport

This video shows a common issue on the Discovery Sport: the coolant level sensor, which is integrated into the expansion tank, fails and triggers a warning light on the dashboard. According to Land Rover procedures, to remove the expansion tank, you would need to disassemble the bumper, grille, and lower the subframe.

This is a lengthy and costly operation. To avoid all that work, the YouTuber cut part of the plastic support of the expansion tank with a rotary tool, creating enough space to slide out the tank and replace it without disassembling half the vehicle.

However, this is an advanced mechanical operation that should only be attempted if you have the necessary tools, skills, and the willingness to accept a permanent modification. You will need a multi-tool like the Dremel 4250 mentioned in the video, which can be found on Amazon with the code /B092ZHNQCL for $137.02; delivery in three days and free shipping for Prime customers.

Work with the engine cold and the negative battery terminal disconnected. Partially drain the coolant from the expansion tank, and disconnect the electrical connector.

The expansion tank is held by a plastic ring; carefully cut a small portion of this support ring (the minimum necessary to create enough space for the tank to pass through). Remove the old one, install the new one, fill the system with coolant, reconnect the battery, and check for leaks.

This is a clever method (it allows for significant savings and is not difficult) but has drawbacks: it is a permanent and irreversible modification; there is a risk of cutting too much and the tank may not be secured properly, leading to a potential leak.

The decision to do this job or rely on a shop mainly depends on your budget, then on your skill level (and also your risk tolerance).