2013 Subaru Forester Has A Check Engine Light

Troubleshooting the Check Engine Light in Your 2013 Subaru Forester: Common Causes and Solutions

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Reviewed by
Bo Fader
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 2013 Subaru Forester 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 2013 Subaru Forester 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 steps to diagnose the check engine light issue in a 2013 Subaru Forester?

When diagnosing the check engine light issue in a 2013 Subaru Forester, it's essential to adopt a systematic diagnostic approach that begins with the simplest solutions before progressing to more complex assessments. Start by checking the basics, such as ensuring that the gas cap is securely fastened, as a loose cap is a frequent trigger for the check engine light. Next, utilize an OBD-II scanner to retrieve any trouble codes from the vehicle's On-Board Diagnostic system. These codes are crucial for pinpointing the specific issues affecting your vehicle. After obtaining the codes, interpret them by consulting a database or the vehicle's manual to understand their meanings, as this will guide your next steps. Pay attention to the behavior of the check engine light; a steady light usually indicates a minor issue, while a flashing light signals a more serious problem that requires immediate attention. If initial checks do not resolve the issue, consider common culprits such as a faulty oxygen sensor or spark plugs, and consult the vehicle's manual for further troubleshooting guidance. If you're still uncertain or the problem persists, seeking professional diagnosis from a Subaru service center is advisable, as they have the expertise and advanced tools necessary for accurate identification and repair.

What are the common problems that could cause the check engine light to illuminate in a 2013 Subaru Forester?

When the check engine light illuminates in a 2013 Subaru Forester, it can signal a range of issues that are important to address promptly. One of the most straightforward problems to check is the gas cap; a loose or damaged cap can lead to fuel vapor leaks and trigger the light. If the gas cap is secure, the next area to investigate is the emission system, particularly the catalytic converter, which can become clogged or fail, affecting both performance and fuel efficiency. Additionally, the fuel system warrants attention; issues such as a failing fuel pump or clogged injectors can lead to drivability problems and may cause the light to flash if a misfire occurs. Ignition system components, including spark plugs and wires, are also critical, as faults here can result in engine misfires and further complications. Sensor failures, particularly with the oxygen or mass airflow sensors, can disrupt engine performance and fuel economy, making them key areas to inspect. Electrical system faults, while more challenging to diagnose, can also trigger the check engine light, often requiring professional assistance. Lastly, a broken head gasket is a serious concern that demands immediate attention to prevent extensive engine damage. For DIY enthusiasts, understanding these common issues can help in troubleshooting and potentially resolving the check engine light concerns effectively.

How urgent is it to address the check engine light in a 2013 Subaru Forester?

When the check engine light illuminates in your 2013 Subaru Forester, it is crucial to understand the urgency of the situation. Ignoring this warning can lead to serious consequences, including decreased fuel efficiency, diminished vehicle performance, and even catastrophic engine failure. A blinking check engine light, in particular, signals a critical issue such as engine misfires, which can cause extensive damage to components like the catalytic converter. Therefore, if you notice this warning, it is advisable to pull over safely and seek professional assistance. Even if the light is steady, it is essential to investigate the cause promptly, as seemingly minor issues, such as a loose gas cap, can escalate into more significant problems if left unaddressed. Utilizing an OBD-II scanner to read trouble codes can provide valuable insights into the underlying issues, allowing for targeted repairs. Ultimately, addressing the check engine light without delay not only safeguards your vehicle's performance but also ensures your safety on the road.

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