2019 Subaru Crosstrek Has Rough Idle

Troubleshooting Causes of Rough Idle in Your 2019 Subaru Crosstrek and How to Resolve Them

Find Repair Location
Reviewed by
Bo Fader
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 2019 Subaru Crosstrek 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 2019 Subaru Crosstrek 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.

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 2019 Subaru Crosstrek?

When faced with a rough idle in your 2019 Subaru Crosstrek, it's essential to adopt a methodical diagnostic approach to identify and resolve the issue effectively. Start by checking the spark plugs, as worn or damaged plugs can lead to misfires that disrupt engine performance. Next, inspect the air filter; a clogged filter can restrict airflow, negatively impacting the engine's operation. Following this, examine the fuel system components, including the fuel injectors and fuel filter, to ensure proper fuel delivery. Utilizing an OBD-II scanner to check for error codes can provide critical insights into any underlying problems. Additionally, look for vacuum leaks in hoses and connections, as these can alter the air-fuel mixture and contribute to a rough idle. Finally, assess the throttle body for cleanliness and functionality, as a dirty throttle body can hinder air intake. By systematically addressing these areas, you can effectively diagnose and remedy the rough idle issue in your Crosstrek, ensuring a smoother driving experience.

What are the common problems that could cause a rough idle in a 2019 Subaru Crosstrek?

When diagnosing a rough idle in your 2019 Subaru Crosstrek, it's essential to consider several common problems that could be affecting your vehicle's performance. One of the primary culprits is a dirty or clogged air filter, which can significantly restrict airflow to the engine, leading to an uneven idle. Additionally, faulty spark plugs are notorious for causing misfires, which can also contribute to a rough idle. Another potential issue is vacuum leaks; these can disrupt the air-fuel mixture, resulting in poor engine performance. Fuel system problems, such as a clogged fuel filter or a malfunctioning fuel pump, can hinder fuel delivery, further exacerbating idle issues. Furthermore, a faulty mass airflow sensor (MAF) can lead to incorrect air intake readings, affecting the overall air-fuel mixture. Lastly, don't overlook the throttle body; if it's dirty or malfunctioning, it can disrupt airflow into the engine, causing a rough idle. By addressing these common problems promptly, you can maintain optimal performance and ensure a smoother driving experience in your Crosstrek. Regular maintenance and timely repairs are key to preventing these issues from arising.

How urgent is it to address the rough idle issue in my 2019 Subaru Crosstrek?

Addressing the rough idle issue in your 2019 Subaru Crosstrek is not just a matter of convenience; it is crucial for the overall health and safety of your vehicle. A rough idle can be a warning sign of deeper mechanical problems that, if left unattended, may escalate into more severe issues, potentially leading to engine damage or failure. Additionally, a rough idle often correlates with decreased fuel efficiency, which can increase your overall operating costs. By prioritizing the resolution of this issue, you not only enhance your vehicle's performance but also safeguard against costly repairs in the future. Regular maintenance and timely intervention are key to ensuring your Subaru Crosstrek remains reliable and efficient, making it essential to address any signs of rough idling as soon as they arise.

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.