2019 Subaru Outback Has A Check Engine Light

Troubleshooting the Check Engine Light in Your 2019 Subaru Outback: Common Causes and Solutions

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Reviewed by
Devin Cabugcal
Written by RepairPal Car Genius
Updated January 14, 2025
0%
40% chance it's the
Emissions System
0%
60% chance it's
Something else
The most common reasons a 2019 Subaru Outback has a check engine light are an emissions system component, a sensor, or a catalytic converter.
  • Emissions System: A faulty emissions system component, such as an oxygen sensor or EGR valve, can lead to increased emissions and trigger the check engine light.
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 Outback has a check engine light?

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.

Due to the nature of electrical systems on modern vehicles, the range of problems these can cause are nearly limitless. However, there is a way to categorize them in two ways. Permanent and intermittent problems. Permanent problems appear and remain. This may be the vehicle will not start, the radio does not work, or the door chime will not turn off among many, many others. These problems are more straight-forward to diagnose since they present themselves at all time. This means there will always be a fault to find. Intermittent electrical problems, however, can be difficult or impossible to locate, since they appear then disappear without warning. The best case scenario for an intermittent issue is when replicating the problem is easily accomplished and understood. This allows a technician to make an issue semi-permanent, allowing them to find the fault. Other issues that come and go without warning and cannot be replicated on demand must occur when the technician is servicing the vehicle, otherwise there is no problem to correct. It is most important to understand that electrical system faults always require inspection, and can include the vehicle working in any manner, or not working at all.

Like we noted in the last section, general diagnosis symptoms are the most vague of the bunch. There are several diagnostic spectrums, electrical diagnosis, drivability diagnostics, engine diagnostics, transmission diagnostics, and the list could continue for about 5 or 10 more spectrums of diagnostics. The most important take-away here, is that general diagnostics are diagnostics that have no other spectrum in which they fit, or the problem is unknown. This means that any vehicle left outside of a repair facility with the keys and an authorization to perform diagnosis will be diagnosed under the general diagnosis spectrum.

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 steps to diagnose the check engine light on a 2019 Subaru Outback?

To effectively diagnose the check engine light on your 2019 Subaru Outback, start with a thorough visual inspection of the vehicle. Begin by checking the gas cap, as a loose or damaged cap is a common and easily fixable issue that can trigger the light. If the gas cap is secure, the next step is to utilize an OBD-II scanner, which you can connect to the vehicle's OBD port. This tool will provide you with specific error codes that indicate the nature of the problem. Once you have the error code, research its meaning in the vehicle's manual or online resources to gain insight into potential issues. Focus on inspecting common culprits such as the oxygen sensor, mass airflow sensor, spark plugs, and catalytic converter, as these components frequently cause the check engine light to activate. If, after these steps, the cause remains unclear, it may be time to consult a professional mechanic for a more in-depth diagnosis. By following this structured approach, you can efficiently identify and address the issue behind the check engine light, saving time and potentially reducing repair costs.

What are the common problems that could cause the check engine light to illuminate in a 2019 Subaru Outback?

When the check engine light comes on in your 2019 Subaru Outback, it can be a source of concern, but understanding the common issues can help you troubleshoot effectively. One of the simplest problems to check is a loose gas cap, which can easily be tightened or replaced if damaged. More complex issues may involve the oxygen sensor, which plays a crucial role in fuel efficiency and emissions; if faulty, it may require replacement. Additionally, problems with the catalytic converter can lead to significant performance issues, and while this may necessitate professional help, being aware of its symptoms can guide your next steps. Spark plugs and ignition coils are also common culprits, as they can cause engine misfires, leading to the check engine light activation. Lastly, a malfunctioning mass airflow sensor can disrupt the engine's air-fuel mixture, prompting the light to illuminate. By familiarizing yourself with these potential issues, you can take proactive measures to diagnose and address the problem, ensuring your Subaru Outback runs smoothly.

How urgent is it to address the check engine light in a 2019 Subaru Outback?

When the check engine light illuminates in your 2019 Subaru Outback, it is crucial to understand the urgency of the situation. This warning light is not merely a nuisance; it signals potential issues within your vehicle's engine or emissions system that could range from minor glitches to serious malfunctions. Ignoring this alert can lead to decreased fuel efficiency and may escalate into more significant engine damage, which can be costly to repair. Moreover, some underlying problems could pose safety risks, making it imperative to act swiftly. For DIY enthusiasts, utilizing an OBD-II scanner can help you diagnose the issue by reading the trouble codes stored in your vehicle's computer. This initial step can guide you in determining whether the problem is something you can address yourself or if it requires professional intervention. By promptly addressing the check engine light, you not only safeguard your vehicle's performance but also enhance your safety on the road.

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2019 Subaru Outback Check Engine Light: Causes & Solutions