2021 Lexus ES300h Engine Makes A Ticking Noise

Common Causes of Ticking Noises in Your 2021 Lexus ES300h Engine and How to Address Them

Find Repair Location
Reviewed by
Aisha
Written by RepairPal Car Genius
Updated January 14, 2025
0%
12% chance it's the
Exhaust Leak
0%
88% chance it's
Something else
The most common reasons a 2021 Lexus ES300h engine makes a ticking noise are low oil level or pressure, an issue with the ignition system, or an exhaust leak.
  • Exhaust Leak: A damaged exhaust manifold or a loose connection in the exhaust system can cause an exhaust leak, resulting in increased noise and potential loss of engine power.
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 Lexus ES300h engine makes a ticking noise?

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.

An engine leaking oil does not always make a puddle on the ground. A burning smell may be noticed from the front of the vehicle after driving. This is because engine oil leaks may fall onto hot engine components, especially the exhaust manifold, and burn off before making it to the ground. This poses a risk to the engine because the leak going unnoticed may deplete the engine oil reserve, and lead to an oil starvation issue. Some engine oil leaks only occur while the engine is running, so the leak may be larger than the small spot on the ground makes it seem.

Noises can be accompanied by many annoying or worrisome sensations. Consider the noise of grinding brakes, the noise sounds much like the brake pedal and steering wheel feel. This is important, as random noises can be difficult to replicate without knowing when the sound occurs, what must be done to make the sound, and what sound it is. Any professional technician can replicate and diagnose most noises, but to ensure the vehicle is more quickly diagnosed, make sure you tell your technician these three pieces of information.

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 could be causing the ticking noise in a 2021 Lexus ES300h engine, and how should I diagnose it?

When faced with a ticking noise in your 2021 Lexus ES300h engine, it's essential to adopt a methodical diagnostic approach to identify the root cause. Start by checking the engine oil level and quality, as low or dirty oil can lead to insufficient lubrication, resulting in ticking sounds. If the oil is adequate, proceed to inspect the valve train components, including the valves, lifters, and camshaft, for any signs of wear or damage that could contribute to the noise. Next, examine the exhaust system for leaks, as these can also produce a ticking sound, particularly when the engine is running. If the ticking persists, assess the timing chain tensioner to ensure it is functioning correctly and maintaining proper tension; a faulty tensioner can lead to significant engine issues. Finally, test the fuel injectors to confirm they are operating properly, as malfunctioning injectors can create unwanted noise. By following this structured approach, you can effectively diagnose and address the ticking noise, ensuring your Lexus ES300h runs smoothly.

What could be causing the ticking noise in the engine of a 2021 Lexus ES300h?

When diagnosing a ticking noise in the engine of a 2021 Lexus ES300h, it's crucial to consider several common problems that could be at play. One of the first things to check is the engine oil level; low oil can lead to increased friction among engine components, resulting in a noticeable ticking sound. If the oil level is adequate, the next area to investigate is the valve lifters. Worn or damaged lifters can create a ticking noise as they operate, indicating that they may need replacement. Additionally, faulty fuel injectors can also contribute to this issue, as they may produce ticking sounds when they fail to deliver fuel properly. An exhaust leak is another potential culprit, where escaping gases can create a ticking noise, often more pronounced during acceleration. Lastly, ensure that the timing belt is properly tensioned; if it is too loose or too tight, it can slap against other components, generating a ticking sound. While these are common issues, it is advisable to consult a qualified mechanic for a thorough inspection to accurately diagnose and resolve the problem, preventing further engine damage.

How urgent is it to address the ticking noise in the engine of my 2021 Lexus ES300h?

When you hear a ticking noise in the engine of your 2021 Lexus ES300h, it’s essential to act swiftly, as neglecting this symptom can lead to serious consequences. The ticking could stem from low oil levels, which can cause inadequate lubrication and result in severe engine damage if not addressed. Additionally, worn-out components or issues with the valve train may be at play, and while some DIY enthusiasts may feel confident in checking oil levels or inspecting for visible wear, a professional diagnosis is often necessary to pinpoint the exact cause. Ignoring this noise not only risks your vehicle's performance but also poses safety concerns, as it may lead to unexpected breakdowns on the road. By addressing the issue early, you can preserve the health of your engine and avoid costly repairs down the line. Therefore, while it may not seem like an immediate emergency, prioritizing the investigation and resolution of the ticking noise is crucial for the longevity and safety of your vehicle.

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 Lexus ES300h Engine Ticking Noise: Causes & Repairs