2017 Subaru Legacy Engine Is Stalling

Common Causes of Engine Stalling in Your 2017 Subaru Legacy and How to Resolve Them

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Reviewed by
Aisha
Written by RepairPal Car Genius
Updated January 14, 2025
0%
30% chance it's the
Fuel System
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15% chance it's the
Air Intake System
0%
55% chance it's
Something else
The most common reasons a 2017 Subaru Legacy 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 2017 Subaru Legacy 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 when a 2017 Subaru Legacy engine is stalling?

When your 2017 Subaru Legacy engine starts stalling, it's essential to adopt a methodical diagnostic approach to identify the root cause effectively. Begin by checking for error codes using an OBD-II scanner, as these codes can reveal specific issues within the engine's systems. Next, inspect the air intake system, focusing on the air filter and mass airflow sensor, as blockages or damage here can significantly impact engine performance. Following this, evaluate the fuel system by examining the fuel pump, filter, and injectors to ensure they are functioning correctly, as fuel delivery problems are common culprits of stalling. Don’t overlook the ignition system; inspect spark plugs and ignition coils for wear or damage, as faulty components can disrupt engine operation. Additionally, test the battery and charging system to rule out electrical issues that may affect engine performance. Finally, check critical engine sensors like the crankshaft and camshaft position sensors, as malfunctioning sensors can lead to stalling. By systematically addressing these areas, you can effectively diagnose and potentially resolve the stalling issue in your Subaru Legacy.

What are the common problems that could cause a 2017 Subaru Legacy engine to stall?

When troubleshooting a stalling engine in a 2017 Subaru Legacy, it's essential to consider several common problems that could be at play. One of the primary culprits is the fuel system, where issues such as a clogged fuel filter or a failing fuel pump can disrupt the flow of fuel to the engine, leading to stalling. Additionally, the ignition system plays a crucial role; faulty spark plugs or a malfunctioning ignition coil can prevent the engine from firing correctly. Airflow problems, often caused by a dirty air filter or a malfunctioning mass airflow sensor, can also hinder engine performance. Furthermore, malfunctioning engine sensors, particularly the crankshaft or camshaft position sensors, can disrupt the engine's timing and lead to stalling. Electrical system faults, including a weak battery or faulty alternator, may also contribute to the issue. Lastly, vacuum leaks in hoses or gaskets can create an imbalance in the air-fuel mixture, resulting in stalling. By systematically diagnosing these areas, DIYers can effectively identify and resolve the stalling issues in their Subaru Legacy.

How urgent is it to address the engine stalling issue in a 2017 Subaru Legacy?

Addressing the engine stalling issue in a 2017 Subaru Legacy is of utmost urgency due to the significant safety risks it poses. An engine that stalls unexpectedly can lead to a loss of control while driving, increasing the likelihood of accidents. Moreover, neglecting this problem can result in more severe damage to the engine and other critical components, leading to costly repairs that could have been avoided with timely intervention. For DIY enthusiasts, it is essential to recognize that regular maintenance and prompt repairs not only enhance vehicle performance but also ensure safety on the road. If you encounter stalling symptoms, it is advisable to consult a qualified mechanic or refer to your vehicle's manual for troubleshooting steps. Taking action quickly can prevent further complications and keep your Subaru Legacy running smoothly.

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2017 Subaru Legacy Engine Stalling: Causes & Repairs