2014 Acura RLX Has A Check Engine Light

Troubleshooting the Check Engine Light in Your 2014 Acura RLX: 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 2014 Acura RLX 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 2014 Acura RLX 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.

A faulty oxygen sensor is one of the most common causes of a check engine light. Symptoms may include a decrease in fuel mileage, hesitation or misfiring from the engine, rough idling or even stalling. A faulty sensor may cause the vehicle to fail an emissions test.

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 2014 Acura RLX?

To effectively diagnose the check engine light on your 2014 Acura RLX, start with a thorough visual inspection of the vehicle. Begin by checking the gas cap; ensure it is securely tightened and free from damage, as a faulty gas cap is a common trigger for the check engine light. If the gas cap appears fine, the next step is to utilize a diagnostic scanner. By connecting the scanner to the OBD-II port, you can retrieve specific error codes that will guide you in identifying the underlying issue. Additionally, consulting the owner’s manual can provide insights into what the check engine light signifies and any manufacturer-recommended troubleshooting steps. It’s crucial to pay attention to the behavior of the check engine light; if it is flashing, this indicates a serious problem that requires immediate action, such as reducing speed and avoiding heavy acceleration until the issue is resolved. By following these steps, you can systematically approach the diagnosis of the check engine light, ensuring a thorough and effective assessment of your vehicle's condition.

What are the common problems that could cause the check engine light to illuminate in a 2014 Acura RLX?

When the check engine light illuminates in a 2014 Acura RLX, it serves as a crucial alert for drivers to investigate potential issues that could affect vehicle performance. One of the most straightforward checks is to ensure that the gas cap is securely tightened, as a loose or damaged cap is a common culprit for triggering the light. If this simple fix doesn’t resolve the issue, the oxygen sensor may be the next component to examine; it plays a vital role in monitoring exhaust emissions and can fail, leading to poor fuel efficiency. Additionally, the catalytic converter is another critical part that can cause the check engine light to activate if it becomes inefficient or fails altogether, often accompanied by noticeable changes in engine performance. Worn spark plugs can also lead to misfires, which will trigger the warning light, indicating that they may need replacement. Furthermore, the mass airflow sensor, responsible for measuring the air entering the engine, can malfunction and disrupt the air-fuel mixture, resulting in performance issues. Lastly, a faulty ignition coil can lead to starting problems or rough engine operation, also causing the check engine light to illuminate. For DIY enthusiasts, addressing these issues promptly is essential to avoid more extensive damage and costly repairs, and while some problems can be tackled at home, others may require the expertise of a professional mechanic for accurate diagnosis and resolution.

How urgent is it to address the check engine light in a 2014 Acura RLX?

When the check engine light illuminates in your 2014 Acura RLX, it signals a potential issue that requires immediate attention. Ignoring this warning can lead to a cascade of problems, including reduced fuel efficiency and compromised engine performance, which may escalate into more severe mechanical failures. For DIY enthusiasts, the first step is to use an OBD-II scanner to retrieve diagnostic trouble codes (DTCs) that can pinpoint the underlying issue. This proactive approach not only helps in understanding the severity of the problem but also allows you to make informed decisions about whether to tackle the repairs yourself or consult a professional. Remember, timely intervention can save you from costly repairs down the line and ensure your vehicle remains safe and reliable on the road.

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