2022 Lexus RX350 Has Rough Idle

Troubleshooting Causes of Rough Idle in Your 2022 Lexus RX350 and How to Resolve Them

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Reviewed by
Andrew Hajjar
Written by RepairPal Car Genius
Updated January 14, 2025
0%
21% chance it's the
Spark Plugs
0%
15% chance it's the
Ignition Coil
0%
64% chance it's
Something else
The most common reasons a 2022 Lexus RX350 has rough idle are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil.
  • Spark Plugs: Worn or fouled spark plugs can lead to misfires, poor fuel economy, and difficulty starting the engine.
  • Ignition Coil: A faulty ignition coil can cause misfires, rough idling, and difficulty starting the engine due to inadequate spark delivery to the spark plugs.
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 2022 Lexus RX350 has rough idle?

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.

Here are a few common symptoms of worn-out brake pads:

  1. Low brake pad warning light is on: Not all vehicles are equipped with this system, but if yours is, this dashboard indicator light will likely be the first signal it’s time to replace your brake pads.
  2. Brakes start to squeal regularly: This is often one of the first signs of worn brake pads and is caused by a metallic piece built into brake pads for this exact purpose. This part contacts the brake rotor to make a squealing or whining noise when the pads are low.
  3. Brakes make loud grinding noise: If not addressed early enough, your brake pads may get so worn that the metal backing plate of the pad grinds against the metal rotor.
  4. Brake pads look thin: You may be able to visually check your brake pad thickness to determine if they need replacement.

Most often, a brake system inspection will just be a routine portion of manufacturer specified maintenance, and will be performed at mileage intervals. In those cases, there will likely be no symptoms. However, when a brake system makes a funny noise, causes vibration, is hard to use, will not slow the vehicle, prevents the vehicle from driving, makes the vehicle pull to one side, or leaks brake fluid, the vehicle will need a visit dedicated to the inspection of the brake system.

What are the initial diagnostic steps to take for a rough idle in a 2022 Lexus RX350?

When faced with a rough idle in your 2022 Lexus RX350, the first step is to utilize an OBD-II scanner to check for any fault codes that may indicate specific issues within the engine. This diagnostic tool can reveal underlying problems that might not be immediately visible. Next, inspect the spark plugs, as worn or fouled plugs can significantly affect engine performance; replacing them can often resolve idle issues. Additionally, examine the air filter for dirt or clogs, as a clean air filter is essential for optimal airflow to the engine. Don’t overlook the vacuum hoses; any leaks or cracks can disrupt the air-fuel mixture, leading to a rough idle, so ensure they are intact. Furthermore, assess the fuel system for potential problems, such as a clogged fuel filter or malfunctioning fuel injectors, which can also contribute to idle irregularities. Lastly, inspect the throttle body for cleanliness and functionality, as a dirty throttle body can hinder engine performance. By systematically addressing these areas, you can effectively diagnose and potentially resolve the rough idle issue in your Lexus RX350.

What are the common problems that could cause a rough idle in a 2022 Lexus RX350?

When addressing a rough idle in your 2022 Lexus RX350, it's crucial to identify the common problems that may be causing this issue. A dirty or clogged air filter can significantly restrict airflow to the engine, leading to performance degradation. Additionally, worn or faulty spark plugs are known to cause misfires, which can manifest as an unstable idle. Vacuum leaks are another potential culprit, as they can disrupt the air-fuel mixture necessary for smooth engine operation. Fuel system issues, such as a clogged fuel filter or malfunctioning fuel injectors, can also contribute to rough idling by affecting fuel delivery. Moreover, a malfunctioning mass airflow sensor may cause the engine to run either too rich or too lean, further complicating the idle problem. Lastly, a faulty Exhaust Gas Recirculation (EGR) valve can interfere with the combustion process, resulting in a rough idle. By systematically inspecting these components, you can effectively diagnose and resolve the rough idle issue in your Lexus RX350, ensuring a smoother driving experience.

How urgent is it to address the rough idle in a 2022 Lexus RX350?

Addressing a rough idle in your 2022 Lexus RX350 is crucial for maintaining both the vehicle's performance and your safety on the road. A rough idle can indicate underlying engine problems, such as issues with the fuel or ignition systems, which, if left unresolved, may lead to decreased fuel efficiency and overall poor performance. Moreover, neglecting this symptom can escalate into more serious engine damage, resulting in costly repairs that could have been avoided with timely intervention. Regular maintenance and prompt attention to any irregularities, like a rough idle, not only enhance your driving experience but also extend the life of your vehicle. Therefore, it is essential to prioritize this issue to ensure your Lexus RX350 operates smoothly and reliably.

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