2020 Toyota Land Cruiser Has Rough Idle

Troubleshooting Causes of Rough Idle in Your 2020 Toyota Land Cruiser 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 2020 Toyota Land Cruiser 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 2020 Toyota Land Cruiser 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 2020 Toyota Land Cruiser?

When addressing a rough idle in your 2020 Toyota Land Cruiser, it's essential to adopt a systematic diagnostic approach that prioritizes simpler checks before delving into more complex issues. Start by inspecting the spark plugs, as worn or dirty plugs can significantly impact engine performance. Next, examine the air filter; a clogged filter restricts airflow, which can lead to an uneven idle. Following this, assess the fuel system by checking the fuel filter and injectors to ensure proper fuel delivery. Utilizing an OBD-II scanner to scan for error codes can provide valuable insights into any underlying problems. Additionally, inspect for vacuum leaks in hoses and connections, as these can disrupt engine performance. Finally, take a look at the throttle body; cleaning or repairing it may resolve idle issues. By methodically working through these steps, you can effectively identify and address the causes of a rough idle in your vehicle.

What are the common problems that could cause a rough idle in a 2020 Toyota Land Cruiser?

When dealing with a rough idle in your 2020 Toyota Land Cruiser, it's essential to understand the common problems that could be at play. One of the first areas to check is the air filter; a dirty or clogged filter can significantly restrict airflow to the engine, leading to performance issues. Additionally, inspect the spark plugs, as worn or faulty plugs can cause misfiring, which directly contributes to a rough idle. Another critical aspect to consider is the vacuum system; any leaks can disrupt the air-fuel mixture, resulting in an unstable idle. Fuel system components, such as the fuel filter and fuel pump, should also be examined, as clogs or malfunctions can hinder engine performance. Furthermore, a faulty oxygen sensor can throw off the air-fuel ratio, exacerbating idle issues. Lastly, don’t overlook the ignition system; problems with components like the ignition coil can lead to rough idling as well. By systematically addressing these areas, you can effectively diagnose and resolve the rough idle in your Land Cruiser, ensuring a smoother driving experience.

How urgent is it to address the rough idle in a 2020 Toyota Land Cruiser?

Addressing a rough idle in your 2020 Toyota Land Cruiser is not just a matter of comfort; it’s crucial for the vehicle's overall health and performance. A rough idle can signal underlying issues with the engine or fuel system, which, if left unchecked, may escalate into more severe problems, potentially leading to costly repairs. Ignoring this symptom can also result in decreased fuel efficiency, straining your wallet at the pump. Moreover, neglecting a rough idle could cause damage to vital engine components, compromising the vehicle's reliability and safety. For those inclined to tackle this issue themselves, it’s essential to conduct regular maintenance checks and be vigilant about any changes in performance. However, if the problem persists, seeking a professional diagnosis is advisable to ensure that the root cause is effectively addressed, safeguarding your investment and enhancing your driving experience.

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