my Toyota Highlander Fourth Generation (2020-present) has a leak in the rear what could it be

Solution

1. Preparation

• Gather tools and parts needed for repairs.
• Park the vehicle on a level surface and engage the parking brake.
• If necessary, raise the vehicle using a jack and secure it with jack stands.

2. Identify the Leak Source

• Sub-step 1: Clean the area around the suspected leak to remove old fluid residues.
• Sub-step 2: Use a dye leak detection kit if the fluid type is uncertain, applying the dye to the suspect system and running the vehicle to identify the source.
• Tools Required: Dye leak detection kit, flashlight.

3. Repair or Replace Affected Components

• Sub-step 1: For rear differential leaks, tighten or replace the differential cover gasket as needed.
• Sub-step 2: If a fuel line leak is identified, replace the damaged line or connection.
• Sub-step 3: For brake fluid leaks, replace any damaged brake lines, calipers, or seals.
• Sub-step 4: If water intrusion is suspected, replace the weather stripping or clear any clogged drainage channels.
• Tools Required: Socket set, wrenches, replacement parts (gasket, fuel line, brake line, weather stripping).

4. Refill Fluids (if applicable)

• Sub-step 1: Refill the rear differential with the appropriate type and quantity of fluid (e.g., 75W-90 gear oil).
• Sub-step 2: Refill brake fluid if any was lost during the repair process.
• Tools Required: Funnel, fluid containers.