2020 Acura TLX Has A Check Engine Light

Troubleshooting the Check Engine Light in Your 2020 Acura TLX: Common Causes and Solutions

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Reviewed by
Bo Fader
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 TLX 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 TLX 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 2020 Acura TLX?

When faced with a check engine light on your 2020 Acura TLX, it's essential to approach the diagnosis methodically. Start by checking the gas cap, as a loose or damaged cap is a common and easily fixable cause of the warning light. Next, take a moment to examine your dashboard gauges for any additional warning lights or unusual readings that might provide further insight into the problem. Conduct a visual inspection of your vehicle for any obvious issues, such as leaks or strange noises, which could indicate a more serious concern. If these initial checks do not resolve the issue, using an OBD-II scanner can be invaluable; it allows you to read the specific error codes that triggered the check engine light, guiding you toward the underlying problem. Finally, consult your owner's manual for tailored advice and troubleshooting steps specific to your model. By following this structured diagnostic approach, you can efficiently identify and address the cause of the check engine light, potentially saving time and money on repairs.

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

When the check engine light comes on in a 2020 Acura TLX, it can be a source of concern for any DIY enthusiast. One of the most straightforward issues to check is the gas cap; a loose or damaged cap can easily trigger the light, and simply tightening or replacing it may resolve the problem. If the light persists, the oxygen sensor could be at fault, as a malfunction here not only affects fuel efficiency but also increases emissions, making it crucial to address. Another common culprit is the catalytic converter, which can fail or become inefficient, leading to more serious engine problems if not attended to promptly. Additionally, worn or faulty spark plugs can significantly impact engine performance, so regular maintenance in this area is advisable. Lastly, a malfunctioning mass airflow sensor can disrupt the engine's air-fuel mixture, causing performance issues and triggering the check engine light. By being aware of these common problems and performing regular checks, DIYers can maintain their Acura TLX's performance and address issues before they escalate.

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

When the check engine light illuminates on your 2020 Acura TLX, it’s crucial to understand the urgency of the situation. This warning signal is not just a minor inconvenience; 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, potentially resulting in costly repairs down the line. While some issues may be minor and easily fixable, it’s essential to conduct a thorough check or consult a professional to avoid further complications. Fortunately, modern vehicles like the TLX come equipped with advanced onboard diagnostics that can help you identify the specific problem. By addressing the check engine light promptly, you not only safeguard your vehicle’s performance but also enhance your safety on the road, making it a vital step in your DIY maintenance routine.

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