2021 Toyota Corolla Is Leaking Oil

Diagnosing Oil Leak Sources in Your 2021 Toyota Corolla and Effective Repair Strategies

Find Repair Location
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 2021 Toyota Corolla 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 2021 Toyota Corolla 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.

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 first steps to diagnose an oil leak in a 2021 Toyota Corolla?

To effectively diagnose an oil leak in your 2021 Toyota Corolla, start by visually inspecting the engine bay and the area beneath the vehicle for any signs of oil accumulation or drips. This initial step helps you locate the general area of the leak. Next, check the oil level using the dipstick; a significant drop in oil level can indicate a leak that needs immediate attention. Pay close attention to the oil filter and drain plug, as these components are common culprits for leaks; ensure they are secure and free from oil residue. Additionally, examine the gaskets and seals, particularly the valve cover gasket and oil pan gasket, for any signs of wear or damage that could be allowing oil to escape. If the source remains elusive, consider adding UV dye to the engine oil, which can help illuminate the leak under a UV light. For a more thorough investigation, a pressure test can be conducted to pinpoint the exact location of the leak. If these steps do not yield results, it may be time to consult a professional mechanic for further diagnosis and repair. This methodical approach not only simplifies the process but also empowers you to tackle the issue with confidence.

What are the common causes of oil leaks in a 2021 Toyota Corolla?

When dealing with oil leaks in a 2021 Toyota Corolla, it's crucial to understand the common culprits that may be at play. One frequent issue is a worn or damaged oil pan gasket, which can deteriorate over time and lead to leaks. Additionally, a faulty oil filter can also be a source of oil leakage, as it may not seal properly, allowing oil to escape from the engine. Another area to inspect is the oil drain plug; if it is loose or damaged, it can result in significant oil loss. Furthermore, the valve cover gasket is another potential leak point, as it can wear out and allow oil to seep into the engine compartment. Lastly, don't overlook the oil cooler lines, as leaks in these lines can also contribute to oil leaks. By regularly inspecting these components and addressing any issues promptly, DIY enthusiasts can maintain their Corolla's performance and prevent further engine damage.

How urgent is it to address an oil leak in a 2021 Toyota Corolla?

When dealing with an oil leak in a 2021 Toyota Corolla, the urgency of the situation cannot be overstated. Ignoring even a minor leak can lead to a cascade of issues, including decreased oil pressure that compromises engine performance and longevity. Over time, the lack of adequate lubrication can result in severe engine damage, which not only incurs costly repairs but may also lead to complete engine failure. Additionally, the safety risks associated with oil leaks are significant; leaking oil can create fire hazards if it comes into contact with hot engine parts. Furthermore, from an environmental perspective, unaddressed oil leaks can contaminate soil and water sources, posing a threat to local ecosystems. Therefore, it is crucial for DIY enthusiasts to monitor oil levels regularly and address any leaks immediately to safeguard their vehicle's performance, ensure safety, and protect the environment.

You’ve got options with RepairPal

Whether you need a more accurate auto repair estimate or help finding a reputable shop in your area, we’ve got you covered.

2021 Toyota Corolla Leaking Oil: Causes & Repair Costs