2) Order and receive new sensor and o-ring.

Remove electric plug pulling straight off/toward front of vehicle.

Remove snap ring with snap-ring pliers.

Observe plastic on sensor where it fits into tank as one side is larger so it will go in only one way.

Place paper towels under sensor/tank area.

Remove old sensor and quickly insert new sensor.

Replace snap-ring, electric plug and a few tablespoons of coolant.

Handle coolant soaked paper towels as poison.