2021 Hyundai Sonata Is Leaking Oil

Discover the Common Causes of Oil Leaks in Your 2021 Hyundai Sonata and How to Resolve Them

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Reviewed by
Devin Cabugcal
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 Hyundai Sonata 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 Hyundai Sonata 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 steps should I take to diagnose the oil leak in my 2021 Hyundai Sonata?

To effectively diagnose an oil leak in your 2021 Hyundai Sonata, begin by parking your vehicle on a level surface and placing a large piece of cardboard beneath the engine overnight. This will help you identify the leak's location by capturing any oil drips. Next, check the oil level using the dipstick; a significantly low level may indicate a leak. Visually inspect the engine for oil stains or puddles, paying close attention to critical areas such as the oil pan, valve cover gasket, oil filter, and drain plug. Ensure that the oil filter and drain plug are secure, tightening them if necessary, and replace any damaged components. Additionally, examine the gaskets and seals for wear, particularly the valve cover gasket and oil pan gasket. If the source of the leak remains elusive, consider performing a pressure test to pinpoint the issue more accurately. By following this structured approach, you can efficiently diagnose and address the oil leak in your Sonata, ensuring your vehicle remains in optimal condition.

What are the common causes of oil leaks in a 2021 Hyundai Sonata?

When dealing with oil leaks in a 2021 Hyundai Sonata, 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 it can deteriorate with age, causing oil to seep out. Furthermore, a loose or damaged oil drain plug can be a significant source of leaks, so checking its tightness and condition is advisable. Lastly, a cracked or damaged oil pan itself can lead to oil loss, necessitating a thorough inspection of this component. Addressing these issues promptly is vital to prevent engine damage and maintain the vehicle's performance, making regular maintenance and inspections key to early detection and resolution of oil leak problems.

How urgent is it to address the oil leak in my 2021 Hyundai Sonata?

Addressing an oil leak in your 2021 Hyundai Sonata is not just a matter of routine maintenance; it is a pressing issue that requires immediate attention. An oil leak can significantly reduce the oil levels in your engine, leading to inadequate lubrication, which is essential for the smooth operation of engine components. This lack of lubrication can result in increased friction, causing wear and tear that may ultimately lead to costly repairs or even complete engine failure. Furthermore, neglecting an oil leak can lead to overheating, as the engine struggles to maintain optimal temperatures without sufficient oil. This overheating can create a cascade of mechanical failures, putting your vehicle at risk of serious damage. Additionally, the safety implications cannot be overlooked; leaking oil can drip onto hot engine parts, creating a fire hazard that endangers both you and your vehicle. Therefore, it is crucial to address any signs of an oil leak promptly to safeguard your engine's health and ensure your safety on the road.

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