2021 Acura NSX Has A Check Engine Light

Troubleshooting the Check Engine Light in Your 2021 Acura NSX: Common Causes and Solutions

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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 2021 Acura NSX 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 2021 Acura NSX 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.

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 2021 Acura NSX?

When faced with a check engine light on your 2021 Acura NSX, it's essential to adopt a methodical diagnostic approach to identify the underlying issue effectively. Start by checking the gas cap; a loose or improperly sealed cap is a common culprit that can easily trigger the warning light. Next, examine your dashboard for any additional warning indicators or messages that might offer further insights into the problem. Pay attention to any unusual noises or odors emanating from the vehicle, as these can signal specific mechanical issues. If these initial checks do not resolve the concern, utilize an OBD-II scanner to access the vehicle's diagnostic system and retrieve error codes, which can provide critical information about the malfunction. Finally, consult your owner's manual for tailored guidance regarding the check engine light and recommended next steps. By following this structured approach, you can efficiently diagnose the issue and determine the best course of action for your Acura NSX.

What are the common problems that could cause the check engine light to activate in a 2021 Acura NSX?

When the check engine light illuminates in a 2021 Acura NSX, it can signal a range of common issues that may be addressed through DIY methods. One of the simplest problems to check is a loose gas cap, which can often be resolved by ensuring it is securely tightened. If the light persists, consider inspecting the oxygen sensor, as a faulty sensor can lead to reduced fuel efficiency and may require replacement. Additionally, issues with the catalytic converter, such as blockages or failures, can also trigger the light, necessitating further investigation. Spark plug wear is another frequent culprit; replacing worn plugs can restore engine performance and extinguish the warning light. The mass airflow sensor is another component to examine, as dirt or failure can disrupt engine function. If you experience engine misfires, it may indicate problems with the ignition coils or the EGR valve, both of which can be tested and replaced if necessary. Lastly, thermostat malfunctions and electronic control module issues can also cause the check engine light to activate, though these may require more advanced diagnostic tools. Addressing these common problems promptly can help maintain your vehicle's performance and prevent further complications.

How urgent is it to address the check engine light in a 2021 Acura NSX?

When the check engine light illuminates in your 2021 Acura NSX, it is crucial to act swiftly, as this warning signals potential issues that could escalate if ignored. The light may indicate problems with the engine or emissions system, which, if left unaddressed, can lead to more severe damage and costly repairs. Modern vehicles, including the NSX, are equipped with advanced diagnostic systems that can help identify the specific issue, making it easier to resolve. Delaying inspection not only risks further damage but can also result in decreased fuel efficiency and performance, potentially compromising your safety on the road. Therefore, it is advisable to have your vehicle checked by a qualified mechanic as soon as possible to ensure its reliability and performance remain intact. Taking prompt action can save you time, money, and ensure a safer driving experience.

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