2020 Subaru Forester Engine Is Stalling

Troubleshooting Causes of Engine Stalling in Your 2020 Subaru Forester and How to Resolve Them

Find Repair Location
Reviewed by
Aisha
Written by RepairPal Car Genius
Updated January 14, 2025
0%
30% chance it's the
Fuel System
0%
15% chance it's the
Air Intake System
0%
55% chance it's
Something else
The most common reasons a 2020 Subaru Forester engine is stalling are the fuel system, the air intake system, or the ignition system.
  • Fuel System: A clogged fuel filter or failing fuel pump can restrict fuel flow, resulting in poor engine performance and starting issues.
  • Air Intake System: A dirty or damaged air filter or a malfunctioning mass airflow sensor can restrict airflow, leading to reduced engine performance and efficiency.
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 Subaru Forester engine is stalling?

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.

Any time there is an emissions fault the check engine light will be displayed. The purpose of the check engine light is to inform the driver that an emission related fault has been found, and that there are on-board diagnostic (OBD) trouble codes stored in the powertrain or engine control module. Additionally, since the emissions systems are so intertwined into engine control and transmission control systems, symptoms may include nearly any sort of drivability concerns. This may include harsh shifting, failure to shift, hesitation on acceleration, jerking, engine failure to start or run, loss of power, or any number of other drivability issues.

When the Check Engine Light comes on, you may experience engine performance issues such as poor acceleration, rough idling, or an engine that won't start. In some cases, no abnormal symptoms will be experienced. Other systems like the transmission or ABS can cause the Check Engine Light to illuminate and lights for those systems can come on at the same time. Similar lights may say "Check Engine Soon", "Malfunction Indicator Light" or just "Check". In rare case the engine can overheat.

What are the initial diagnostic steps to take for a stalling engine in a 2020 Subaru Forester?

When troubleshooting a stalling engine in your 2020 Subaru Forester, it's essential to adopt a methodical diagnostic approach. Start by checking the fuel system; ensure that your fuel tank is adequately filled and inspect the fuel lines for any leaks or blockages that could hinder fuel delivery. Next, turn your attention to the air intake system, where a clogged air filter can restrict airflow and affect engine performance. Following this, examine the ignition system by inspecting the spark plugs for signs of wear or fouling, and ensure that the ignition coils are functioning correctly. Utilizing an OBD-II scanner can provide valuable insights by revealing any stored error codes in the vehicle's computer system, which can point you toward specific issues. Additionally, check the battery to confirm it is in good condition and fully charged, as a weak battery can contribute to stalling. Finally, inspect the engine sensors, such as the mass airflow and oxygen sensors, for any malfunctions that may be impacting performance. By systematically addressing these areas, you can effectively diagnose and resolve the stalling issue in your Subaru Forester.

What are the common causes of engine stalling in a 2020 Subaru Forester?

When diagnosing engine stalling in a 2020 Subaru Forester, it's crucial to consider several common problems that may be at play. One of the primary culprits is the fuel system, where issues like a clogged fuel filter or a malfunctioning fuel pump can disrupt the flow of fuel to the engine, leading to stalling. Additionally, the ignition system plays a vital role; failing components such as ignition coils or worn spark plugs can prevent the engine from firing properly. Airflow is another critical factor; a dirty air filter or a faulty mass airflow sensor can restrict the air needed for combustion, resulting in stalling. Furthermore, sensor failures, particularly with the crankshaft position or oxygen sensors, can significantly impact engine performance. Lastly, electrical issues, including a weak battery or damaged wiring, can also contribute to stalling. By understanding these potential problems, DIYers can take proactive steps to troubleshoot and maintain their Subaru Forester, ensuring a smoother driving experience. Regular inspections and timely repairs are essential to keep these issues at bay and maintain optimal engine performance.

How urgent is it to address the engine stalling issue in a 2020 Subaru Forester?

Addressing the engine stalling issue in a 2020 Subaru Forester is of utmost urgency due to the serious safety risks it poses. Stalling can occur unexpectedly while driving, leading to a sudden loss of power and control, which can result in dangerous situations for both the driver and other road users. Ignoring these symptoms not only increases the likelihood of accidents but can also lead to more severe mechanical problems, potentially incurring costly repairs down the line. For those considering a DIY approach, it is crucial to recognize that while some issues may seem minor, they can escalate quickly if not addressed. Therefore, consulting with a qualified mechanic or an authorized Subaru service center is highly recommended to accurately diagnose the root cause of the stalling and implement the necessary repairs. Prioritizing this issue ensures the safety and reliability of your vehicle, allowing you to drive with confidence.

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.

2020 Subaru Forester Engine Stalling: Causes & Repairs