2019 Toyota Highlander Is Leaking Oil

Identifying the Causes of Oil Leaks in Your 2019 Toyota Highlander and How to Address Them

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Reviewed by
Bo Fader
Written by RepairPal Car Genius
Updated January 14, 2025
0%
80% chance it's the
Oil System Components
0%
20% chance it's the
Engine Gaskets
The most common reasons a 2019 Toyota Highlander is leaking oil are oil system component failure and leaking engine gaskets.
  • Oil System Components: A worn or damaged oil pump or filter can lead to low oil pressure, resulting in inadequate lubrication and potential engine damage.
  • Engine Gaskets: A worn or damaged engine gasket can lead to oil or coolant leaks, resulting in engine overheating or loss of lubrication.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How much does it cost to fix a 2019 Toyota Highlander is leaking oil?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

Oil pans don't wear out or break like other parts, they generally only need to be replaced because of external damage from an accident or an improperly tightened drain plug. The main symptom you will experience is an oil leak underneath the engine of your car. The oil that leaks from a damaged oil pan will range from dark brown to dark black. If the leak is large enough or occurs for long enough the oil level will be low enough to turn the oil pressure or low oil level warning light on.

An oil leak may be noted on the ground where the vehicle is parked. However, many vehicles have plastic trays underneath the engine that may catch leaking oil and conceal the leak. In such cases, a low oil level, a burning oil smell, or even smoke from oil burning in the engine bay may be noted.

»MORE: Signs of a bad oil pan gasket

The engine oil pressure warning light will come on if the engine oil pressure is low, or if the oil pressure sensor is faulty. In either case, engine power may be reduced significantly. The check engine light may also illuminate, and an on-board diagnostic (OBD) trouble code will be stored in the vehicle's computer.

What are the initial steps to diagnose the oil leak in a 2019 Toyota Highlander?

When diagnosing an oil leak in a 2019 Toyota Highlander, start by visually inspecting the engine and its components for any signs of oil seepage. Focus on areas such as the oil filter, oil pan, and transmission, as these are common leak points. Next, check the oil level to determine if there has been a significant drop, which could indicate a leak. Pay special attention to the oil filter and drain plug; ensure they are secure and free from leaks, tightening or replacing them if necessary. Additionally, examine the gaskets and seals for any signs of wear or damage, as these can often be culprits in oil leaks. If the source remains elusive, consider adding UV dye to the oil, which can help you trace the leak with a UV light. If these steps do not yield results, or if the problem appears complex, consulting a qualified mechanic is advisable for a thorough inspection and professional guidance. By following this diagnostic approach, you can effectively identify and address oil leaks in your Highlander.

What are the common causes of oil leaks in a 2019 Toyota Highlander?

When dealing with oil leaks in a 2019 Toyota Highlander, it's crucial to understand the common culprits that may be at play. One frequent issue is a degraded or damaged oil pan gasket, which can wear out over time and lead to leaks. Additionally, a faulty or improperly installed oil filter can also result in oil escaping, making it essential to ensure that the filter is correctly fitted. Another area to inspect is the valve cover gasket, as this component can deteriorate with age, causing oil to seep out. Furthermore, the oil cooler lines are susceptible to wear and tear, which can lead to leaks if they become damaged. Lastly, don't overlook the oil drain plug; if it is damaged or not tightened properly, it can be a source of oil leaks. Addressing these issues promptly is vital to maintaining your vehicle's performance and preventing potential engine damage, so regular inspections and maintenance are highly recommended for any DIY enthusiast.

How urgent is it to address the oil leak in my 2019 Toyota Highlander?

Addressing an oil leak in your 2019 Toyota Highlander is not just a matter of routine maintenance; it is a pressing issue that requires immediate attention. Ignoring an oil leak can lead to a significant drop in oil levels, which compromises the lubrication of essential engine components. This lack of lubrication can result in severe engine damage over time, leading to costly repairs that could have been easily avoided. Furthermore, an oil leak can cause the engine to overheat, as insufficient oil circulation prevents proper cooling, increasing the risk of engine failure. Beyond mechanical concerns, there are safety implications to consider; leaking oil can drip onto hot engine parts, creating a fire hazard that endangers both the vehicle and its occupants. Therefore, it is crucial to address any signs of an oil leak promptly to maintain the safety, efficiency, and longevity of your Toyota Highlander.

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2019 Toyota Highlander Leaking Oil: Causes & Repairs