2005 Acura RL Has A Check Engine Light

Troubleshooting the Check Engine Light in Your 2005 Acura RL: Common Causes and Solutions

Find Repair Location
Reviewed by
Devin Cabugcal
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 2005 Acura RL 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 2005 Acura RL 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 diagnostic steps to take for a check engine light on a 2005 Acura RL?

When faced with a check engine light on your 2005 Acura RL, it's essential to adopt a systematic diagnostic approach. Start by checking the gas cap; a loose or damaged cap is a common culprit that can easily trigger the light. Next, take a moment to observe your dashboard for any additional warning lights, as these may indicate more serious underlying issues. Utilizing an OBD-II scanner is a crucial step in this process; it allows you to retrieve error codes from the vehicle's computer, providing insights into the specific problem at hand. Pay attention to any unusual symptoms your vehicle may exhibit, such as strange noises or rough idling, as these can help pinpoint the issue. If these initial steps do not lead to a resolution, consulting a qualified mechanic is advisable, as they possess the expertise and tools necessary for a thorough diagnosis. By following this structured approach, you can effectively identify the cause of the check engine light and take appropriate action.

What are the common problems that could cause the check engine light to illuminate in a 2005 Acura RL?

When the check engine light comes on in a 2005 Acura RL, it can be a source of concern for any car owner. One of the simplest issues to check is the gas cap; if it’s loose or damaged, it can easily trigger the light. Another common culprit is the oxygen sensor, which, when faulty, not only affects the check engine light but can also lead to reduced fuel efficiency. Additionally, problems with the catalytic converter can cause the light to illuminate, often indicating a failure or inefficiency that needs attention. Spark plugs and ignition coils are also critical components; if they malfunction, they can cause engine misfires, resulting in the check engine light turning on. The mass airflow sensor is another key player; a malfunction here can disrupt the air-fuel mixture, leading to performance issues. Furthermore, issues with the exhaust gas recirculation (EGR) system, such as a clogged valve, can also trigger the light. Lastly, a faulty thermostat can cause overheating, which is another reason the check engine light may illuminate. Addressing these issues promptly is essential to maintain your vehicle's performance and prevent further damage, making it wise to conduct a thorough inspection or consult a mechanic if the light appears.

How urgent is it to address the check engine light in a 2005 Acura RL?

Addressing the check engine light in your 2005 Acura RL is crucial for maintaining the health and safety of your vehicle. Ignoring this warning can lead to a range of problems, from minor inconveniences to severe engine damage, which can be costly to repair. The check engine light may indicate issues such as a faulty sensor, a loose gas cap, or more serious engine malfunctions. By promptly investigating the cause of the light, you not only safeguard your vehicle's performance but also enhance fuel efficiency, as unresolved issues can lead to increased fuel consumption. For DIY enthusiasts, it’s essential to understand that while some problems may be simple fixes, others could require professional intervention. Therefore, taking immediate action when the check engine light illuminates is vital to prevent escalating repairs and ensure your Acura RL remains reliable on the road.

You’ve got options with RepairPal

Whether you need a more accurate auto repair estimate or help finding a reputable shop in your area, we’ve got you covered.