2020 Acura RDX Has A Check Engine Light

Common Causes of the Check Engine Light in Your 2020 Acura RDX and How to Resolve Them

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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 2020 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 2020 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 2020 Acura RDX?

To effectively diagnose the check engine light on your 2020 Acura RDX, 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 loose or faulty gas cap is a common trigger for the check engine light. If the gas cap appears fine, the next step is to utilize an OBD-II scanner, which can be easily purchased or borrowed. Connect the scanner to the vehicle's diagnostic port, typically located under the dashboard, and retrieve the error code that the onboard computer has logged. This code is crucial as it points to the specific issue affecting your vehicle. Once you have the error code, research its meaning using the vehicle's manual or reputable online resources to gain insight into the problem. If the issue seems straightforward, you may be able to address it yourself; however, if the error code indicates a more complex problem or if you are unsure how to proceed, it is wise to consult a professional mechanic for further diagnosis and assistance. By following these steps, you can take a proactive approach to understanding and resolving the check engine light issue in your Acura RDX.

What are the common problems that could cause the check engine light to illuminate in a 2020 Acura RDX?

When the check engine light comes on in your 2020 Acura RDX, it can be a source of concern, but understanding the common problems can help you diagnose the issue before seeking professional help. One of the simplest causes could be a loose gas cap, which is often overlooked but can easily trigger the light. If the gas cap is secure, consider checking the oxygen sensor, as a malfunction here can affect your vehicle's fuel efficiency and emissions. Another potential culprit is the catalytic converter; if it’s failing or inefficient, it can lead to significant performance issues. Additionally, problems with spark plugs or ignition coils can cause engine misfires, which will also activate the check engine light. Lastly, a malfunctioning mass airflow sensor can disrupt the air-fuel mixture, leading to further complications. Addressing these issues promptly not only helps in maintaining your vehicle's performance but also prevents more serious damage down the line. If you're not comfortable diagnosing these problems yourself, consulting a qualified mechanic is always a wise choice.

How urgent is it to address the check engine light on a 2020 Acura RDX?

When the check engine light illuminates on your 2020 Acura RDX, it is crucial to take immediate action rather than dismissing it as a minor inconvenience. This warning signal is your vehicle's way of alerting you to potential issues within the engine or emissions system, which, if left unchecked, could escalate into more severe problems. While some triggers, like a loose gas cap, may seem trivial, others could indicate significant mechanical failures that could compromise your vehicle's performance and safety. Ignoring the light can lead to decreased fuel efficiency, increased emissions, and even costly repairs down the line. Therefore, it is advisable to conduct a preliminary diagnostic check using an OBD-II scanner, which can help identify the specific trouble codes associated with the light. However, for a comprehensive assessment and to ensure that any underlying issues are properly addressed, consulting a qualified mechanic or dealership is recommended. By acting promptly, you not only safeguard your vehicle's health but also enhance its longevity and reliability on the road.

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