2021 Lexus RX350 Engine Makes A Ticking Noise

Resolve Ticking Noise in 2021 Lexus RX350 Engine for a Smooth Ride

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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 RX350 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 RX350 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.

If the drive belt idler pulley fails, there will be a very audible chirping noise from the front of the engine. This is because the idler pulley bearing is no longer smooth, and rotating causes metal to grind at high speeds. If it is not changed immediately, there is a chance it will become dislodged, or allow the drive belt to slip off. If the belt falls off, the accessory that it drives will no longer function. For instance, if the alternator belt idler pulley fails, the alternator may stop functioning. Also if the pulley begins to wobble, allowing slack in the belt, it will make an extremely loud squeaking or screeching noise, especially on cold starts. This is the belt slipping on the crankshaft pulley, and will require belt replacement once the idler pulley is replaced.

If the drive belt tensioner fails, there will be a very audible chirping, grinding, or rattling noise from the front of the engine. This is because the tensioner pulley bearing is no longer smooth, and rotating causes metal to grind at high speeds. If it is not changed immediately, there is a chance it will become dislodged, or allow the drive belt to lose tension, or break. If the belt falls off, the accessory that it drives will no longer function. Also, if the tensioner spring fails, allowing slack in the belt, it may make an extremely loud squeaking or screeching noise combined with a rattle as the tensioner bounces back and forth under load. The squealing noise is the belt slipping on the crankshaft pulley, and will require belt replacement once the belt tensioner is replaced.

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 RX350, and what diagnostic steps should be taken first?

When faced with a ticking noise in your 2021 Lexus RX350, the first step is to check the engine oil level, as low oil can lead to increased friction and noise. If the oil level is adequate, proceed to inspect the engine components, paying close attention to the valves, lifters, and timing chain for any signs of wear or damage. Listening carefully to pinpoint the exact location of the noise can also help narrow down potential issues. Additionally, examine the exhaust system for any leaks or loose parts that might contribute to the ticking sound. Utilizing a diagnostic scanner to check for error codes can provide further insights into underlying problems. If these steps do not reveal the cause, it may be time to consult a qualified mechanic for a more thorough diagnosis. By following this structured approach, you can effectively identify and address the ticking noise in your vehicle.

What are the common causes of a ticking noise in the engine of a 2021 Lexus RX350?

When you hear a ticking noise coming from the engine of your 2021 Lexus RX350, it’s crucial to identify the source to prevent further damage. One common culprit is low engine oil, which can lead to increased friction among engine components, resulting in that distinct ticking sound. Regularly checking and maintaining proper oil levels can help mitigate this issue. Another potential cause is worn valve lifters; as these components degrade over time, they may not function smoothly, leading to a ticking noise during operation. Additionally, faulty fuel injectors can contribute to the problem, as they may create a ticking sound when they fail to operate correctly. Loose belts or pulleys can also be a source of noise, as their movement can cause vibrations that manifest as ticking. Lastly, an exhaust leak can produce a similar sound, as escaping gases create a ticking effect. By understanding these common causes, you can take the necessary steps to diagnose and resolve the ticking noise in your engine, ensuring your Lexus RX350 runs smoothly.

How urgent is it to address the ticking noise in the engine of a 2021 Lexus RX350?

Addressing a ticking noise in the engine of your 2021 Lexus RX350 is not just a matter of convenience; it is a critical step in maintaining the health and safety of your vehicle. Early detection of this noise can prevent minor issues from escalating into major mechanical failures, which could lead to costly repairs. Ignoring the sound may result in severe damage to engine components, jeopardizing the reliability of your vehicle and potentially putting you at risk while driving. Moreover, unusual engine noises often signal underlying problems that require immediate attention to ensure your safety on the road. If your vehicle is still under warranty, prompt action can also safeguard you from out-of-pocket expenses for necessary repairs. Therefore, it is highly advisable to consult a qualified mechanic who can accurately diagnose the source of the ticking noise and recommend appropriate solutions. Taking these steps not only preserves the performance of your Lexus RX350 but also enhances your peace of mind while driving.

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2021 Lexus RX350 Engine Ticking Noise: Causes & Solutions