For 1990-2009 cars

1. Remove the oil level sensor (1) and retaining clip (3).
2. Clean the lower oil pan (4). Remove any sludge or other deposits.
3. Clean the lower oil pan mating surface.
4. Inspect the lower oil pan (4) for dents or distortion.
5. Inspect the lower oil pan mating surface for damage.
6. Replace the lower oil pan (4) if any damage is found.
7. Install the oil level sensor (1) and retaining clip (3).