2019 Acura RDX Has A Check Engine Light

Troubleshooting the Check Engine Light in Your 2019 Acura RDX: Common Causes and Solutions

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Reviewed by
Aisha
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 Acura RDX 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 Acura RDX 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 2019 Acura RDX?

To effectively diagnose the check engine light on your 2019 Acura RDX, start with a thorough visual inspection of the vehicle. Pay particular attention to the gas cap, ensuring it is securely fastened and free from damage, as a faulty gas cap is a common trigger for the light. Next, utilize an OBD-II scanner to connect to the vehicle's diagnostic port; this tool will help you retrieve specific error codes that indicate the nature of the problem. Additionally, observe any other symptoms your vehicle may be exhibiting, such as unusual noises or performance issues, as these can provide further clues. It’s also beneficial to consult your owner’s manual, which may offer insights into the check engine light's meaning and recommended troubleshooting steps. If these initial steps do not lead to a resolution, or if the issue appears to be more complex, seeking assistance from a qualified mechanic is advisable to ensure proper diagnosis and repair. By following this structured approach, you can efficiently identify and address the cause of the check engine light, potentially saving time and money in the process.

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

When the check engine light comes on in a 2019 Acura RDX, it can be a source of concern for any driver. Understanding the common problems that may cause this warning light to illuminate is crucial for effective troubleshooting. One of the simplest issues to check is the gas cap; a loose or damaged cap can easily trigger the light, so ensure it is tightened properly. Another frequent culprit is the oxygen sensor, which monitors the air-fuel mixture and can fail over time, leading to performance issues. Additionally, problems with the catalytic converter, such as blockages or inefficiencies, can also set off the check engine light, indicating a need for inspection. Spark plugs and ignition coils are vital components that, when worn or faulty, can cause engine misfires, resulting in the light turning on. The mass airflow sensor, responsible for measuring air intake, can malfunction and disrupt engine performance, while issues with the exhaust gas recirculation (EGR) system, including clogs, can also be a factor. Lastly, a vacuum leak can create various engine problems, including triggering the check engine light. Addressing these issues promptly is essential to maintain your vehicle's performance and prevent further damage, making it advisable to conduct a thorough inspection or consult a mechanic if the light remains illuminated.

How urgent is it to address the check engine light in a 2019 Acura RDX?

When the check engine light illuminates in your 2019 Acura RDX, it is essential to recognize the urgency of the situation. This warning light is not merely a nuisance; it serves as a critical indicator of potential issues within your engine or emissions system. While some triggers, like a loose gas cap, may seem minor, neglecting the light can lead to more severe problems that could compromise your vehicle's performance, fuel efficiency, and emissions control. For DIY enthusiasts, the first step is to use an OBD-II scanner to retrieve diagnostic trouble codes, which can provide valuable insights into the underlying issue. Addressing these codes promptly can prevent further damage and costly repairs down the line. Moreover, unresolved issues can pose safety risks, potentially leading to breakdowns or unsafe driving conditions. Therefore, while it may not always be an emergency, taking immediate action to diagnose and resolve the check engine light is crucial for maintaining the health and reliability of your Acura RDX.

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2019 Acura RDX Check Engine Light: Causes & Solutions