2013 Toyota Highlander Has Rough Idle

Troubleshooting Causes of Rough Idle in Your 2013 Toyota Highlander 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 2013 Toyota Highlander 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 2013 Toyota Highlander 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 2013 Toyota Highlander?

When faced with a rough idle in your 2013 Toyota Highlander, it's essential to adopt a methodical diagnostic approach to identify the root cause effectively. Start by checking the spark plugs, as worn or damaged plugs can significantly impact engine performance and lead to rough idling. Next, inspect the air filter; a clogged filter can restrict airflow, causing the engine to struggle at idle. Following this, examine the fuel system components, including the fuel injectors and fuel filter, to ensure they are functioning correctly, as any issues here can disrupt the engine's performance. Utilizing an OBD-II scanner to check for error codes can provide valuable insights into potential problems, guiding your next steps. Additionally, don't overlook the PCV valve; a malfunctioning valve can adversely affect idle quality. Lastly, inspect for any vacuum leaks in hoses and connections, as these can disrupt the air-fuel mixture and lead to rough idling. By systematically addressing these areas, you can effectively diagnose and resolve the rough idle issue in your Highlander.

What are the common causes of a rough idle in a 2013 Toyota Highlander?

When dealing with a rough idle in your 2013 Toyota Highlander, it's crucial 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 affects engine smoothness. Another potential culprit is vacuum leaks, which can disrupt the air-fuel mixture and result in an unstable idle. Don't overlook the fuel system; a clogged fuel filter or malfunctioning fuel injectors can hinder engine performance. Furthermore, the Mass Airflow Sensor (MAF) plays a vital role in regulating the air-fuel mixture, and any malfunction here can lead to rough idling. Lastly, consider the Exhaust Gas Recirculation (EGR) valve, as issues with this component can also contribute to an uneven idle. By systematically checking these areas, you can effectively diagnose and address the rough idle in your Highlander, ensuring a smoother driving experience.

How urgent is it to address the rough idle in a 2013 Toyota Highlander?

Addressing a rough idle in your 2013 Toyota Highlander is crucial for maintaining both the vehicle's performance and your safety on the road. Ignoring this symptom can lead to a cascade of problems, including decreased fuel efficiency and diminished engine performance, which may escalate into more severe mechanical failures. A rough idle often signals underlying issues, such as dirty fuel injectors or worn spark plugs, which, if left unattended, could develop into costly repairs. More alarmingly, it could indicate serious problems like a malfunctioning sensor or a vacuum leak, which not only compromise your vehicle's functionality but also pose safety risks. Therefore, it is essential to prioritize a thorough inspection by a qualified mechanic to diagnose the root cause of the rough idle. By addressing this issue promptly, you can prevent further complications and ensure the longevity and reliability of your Highlander.

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2013 Toyota Highlander Rough Idle: Causes & Repairs