2016 Subaru Outback Has A Check Engine Light

Troubleshooting the Check Engine Light in Your 2016 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 2016 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 2016 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 initial diagnostic steps to take for a check engine light on a 2016 Subaru Outback?

When the check engine light illuminates on your 2016 Subaru Outback, it's essential to adopt a systematic diagnostic approach to identify the underlying issue. Begin by observing the behavior of the light; a steady glow may indicate a minor issue, while a flashing light signals a serious problem that requires immediate attention. Next, check for simple fixes, such as ensuring the gas cap is securely tightened, as a loose or damaged cap is a common culprit that can easily be resolved. Pay attention to any additional symptoms your vehicle may exhibit, such as unusual noises or performance issues, as these can provide valuable clues. Utilizing an OBD-II scanner is a crucial step; by connecting it to the vehicle's data link connector, you can retrieve trouble codes that pinpoint specific problems. Once you have these codes, researching their meanings will help you understand the potential issues, ranging from faulty sensors to fuel system problems. If the light is intermittent, take note of the driving conditions when it appears, as this information can assist in diagnosing the problem. Should you find yourself uncertain about the codes or if the light persists despite your efforts, consulting a professional mechanic is advisable, as they possess the expertise and tools necessary for a thorough diagnosis. By following this structured approach, you can effectively troubleshoot the check engine light issue in your Subaru Outback, potentially saving time and money on repairs.

What are the common problems that could cause the check engine light to illuminate in a 2016 Subaru Outback?

When the check engine light illuminates in your 2016 Subaru Outback, it can be a source of concern, but understanding the common problems can help you diagnose the issue effectively. One frequent culprit is a loose or missing gas cap, which can lead to fuel vapor leaks and reduced fuel efficiency. Another common issue is a failing catalytic converter, particularly in older vehicles, which can hinder performance and fuel economy. Additionally, a faulty oxygen sensor can disrupt the air-fuel mixture, potentially causing engine damage if not addressed. Worn or fouled spark plugs and spark plug wires may also lead to engine misfires, indicated by a flashing check engine light, signaling the need for immediate attention. Other potential causes include a dirty mass air flow sensor, faulty emissions control components, and even issues with the vehicle's battery or transmission. By being aware of these common problems, you can take proactive steps to troubleshoot and resolve the issue, ensuring your Subaru Outback runs smoothly.

How urgent is it to address the check engine light in a 2016 Subaru Outback?

When it comes to the check engine light in your 2016 Subaru Outback, understanding the urgency of the situation is crucial for both safety and vehicle longevity. A steady glow of the light typically signals a minor issue, such as a loose gas cap or a dirty mass airflow sensor, which, while not immediately critical, should be addressed soon to avoid potential complications. However, if the light is flashing, this indicates a serious problem, often related to engine misfires that can lead to severe damage, including harm to the catalytic converter. In such cases, it is imperative to refrain from driving the vehicle and seek immediate professional assistance. Additionally, if you experience performance issues like reduced acceleration or the vehicle entering "limp-mode," these symptoms warrant prompt attention to prevent further engine damage. Ignoring the check engine light can escalate minor issues into costly repairs, making it essential to prioritize any warning signals your vehicle presents.

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