2023 Subaru Impreza Has A Check Engine Light

Troubleshooting the Check Engine Light in Your 2023 Subaru Impreza: Common Causes and Solutions

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Reviewed by
Andrew Hajjar
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 2023 Subaru Impreza 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 2023 Subaru Impreza 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 on a 2023 Subaru Impreza?

When faced with a check engine light on your 2023 Subaru Impreza, start by checking for visible issues, such as ensuring that the gas cap is securely tightened and in good condition, as a loose or damaged cap is a common culprit. Next, utilize an OBD-II scanner to connect to your vehicle's diagnostic port; this tool will help you retrieve the specific error code associated with the light. Once you have the code, refer to your vehicle's manual or reliable online resources to interpret its meaning. This step is crucial as it allows you to assess the severity of the issue—some codes may indicate minor problems that can be addressed easily, while others may signal more serious concerns that require immediate attention. If you find yourself uncertain about the error code or the necessary steps to take, it’s wise to consult a professional mechanic or dealership for further assistance. By following this structured approach, you can effectively diagnose the check engine light and take appropriate action to resolve any issues.

What are the common problems that could cause the check engine light to illuminate in a 2023 Subaru Impreza?

When the check engine light comes on in a 2023 Subaru Impreza, it can be concerning, but many common issues can be diagnosed and potentially resolved by DIY enthusiasts. One of the simplest problems to check is a loose gas cap, which can easily be tightened or replaced if damaged. Another frequent culprit is a faulty oxygen sensor; while this may require a bit more technical knowledge to replace, it is a manageable task for those familiar with automotive repairs. Additionally, issues with the catalytic converter, spark plugs, or ignition coils can also trigger the light, and these components can often be inspected and replaced with basic tools. A malfunctioning mass airflow sensor and problems with the exhaust gas recirculation (EGR) system are also common causes that can be addressed with some research and effort. By understanding these potential issues, DIYers can take proactive steps to diagnose and fix the problem, ensuring their Subaru Impreza runs smoothly and efficiently. However, if the problem persists or seems beyond a simple fix, consulting a qualified mechanic is always a wise choice to prevent further damage.

How urgent is it to address the check engine light in a 2023 Subaru Impreza?

When the check engine light illuminates in your 2023 Subaru Impreza, it is essential to understand the urgency of the situation. This warning signal is not merely a nuisance; it indicates that there may be underlying issues with your vehicle's engine or emissions system that could affect performance and fuel efficiency. Ignoring this light can lead to more severe problems down the line, potentially resulting in costly repairs that could have been avoided with timely attention. While some issues may be minor and easily fixable, it is crucial to conduct a thorough diagnostic check, which can often be done with an OBD-II scanner available for DIY enthusiasts. These scanners can help identify the specific trouble codes associated with the check engine light, allowing you to determine whether the problem is something you can address yourself or if it requires professional intervention. By taking the check engine light seriously and acting promptly, you not only safeguard your vehicle's performance but also enhance your overall driving experience.

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