2021 Hyundai Veloster Has A Check Engine Light

Resolve Check Engine Light Issues in Your 2021 Hyundai Veloster

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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 Hyundai Veloster 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 Hyundai Veloster 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 first steps to diagnose the check engine light on a 2021 Hyundai Veloster?

When faced with a check engine light on your 2021 Hyundai Veloster, it's essential to adopt a systematic diagnostic approach. Start by checking for visible issues, such as ensuring that the gas cap is securely tightened and in good condition, as a loose or damaged cap is a common trigger for the light. If everything appears normal, the next step is to utilize an OBD-II scanner, which can be easily connected to the vehicle's OBD port. This tool will allow you to retrieve the specific error code that is causing the check engine light to illuminate. Once you have the error code, take the time to research its meaning, either through the vehicle's manual or reputable online resources. Understanding the code will guide you in determining the necessary actions to resolve the issue. If the problem remains unclear or if you're uncomfortable performing further diagnostics, seeking assistance from a qualified mechanic or an authorized Hyundai service center is a wise choice. This methodical approach not only helps in identifying the problem efficiently but also ensures that you address it effectively, potentially saving time and money in the long run.

What are the common problems that could cause the check engine light to illuminate in a 2021 Hyundai Veloster?

When the check engine light comes on in a 2021 Hyundai Veloster, it can be a source of concern for any DIY car owner. One of the most straightforward issues to check is the gas cap; a loose or damaged cap can disrupt the fuel system and trigger the light. If the gas cap is secure, the next step is to consider the oxygen sensor, which plays a crucial role in fuel efficiency and emissions control. A faulty sensor can lead to poor performance and should be inspected. Additionally, problems with the catalytic converter can also cause the check engine light to illuminate, often indicating a failure or inefficiency that needs addressing. Spark plugs are another common culprit; worn or faulty plugs can affect engine performance and lead to misfires. Furthermore, a malfunctioning mass airflow sensor can disrupt the engine's air-fuel mixture, resulting in poor running conditions. Lastly, issues with the ignition coil can cause rough idling and misfiring, which will also trigger the check engine light. By understanding these common problems, DIY enthusiasts can take the first steps toward diagnosing and potentially resolving the issue before seeking professional help.

How urgent is it to address the check engine light in a 2021 Hyundai Veloster?

When the check engine light illuminates in your 2021 Hyundai Veloster, it is crucial to act swiftly, as this warning can indicate a range of issues that may escalate if left unaddressed. Ignoring this signal can lead to more severe engine problems, increased repair costs, and even safety hazards, such as engine misfires or overheating. For DIY enthusiasts, this is a call to action; diagnosing the problem early can not only save you money but also enhance your vehicle's performance and fuel efficiency. By promptly investigating the cause of the check engine light, you can prevent further damage and ensure that your Veloster remains reliable and safe on the road. Taking the time to address this warning light is an essential step in responsible vehicle maintenance, allowing you to enjoy your driving experience without the looming threat of unexpected breakdowns.

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