2021 Kia Sportage Has A Check Engine Light

Resolve Check Engine Light Issues in Your 2021 Kia Sportage

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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 2021 Kia Sportage 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 Kia Sportage 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 2021 Kia Sportage?

When faced with a check engine light on your 2021 Kia Sportage, the first step is to check for any visible issues, particularly the gas cap, as a loose or damaged cap can often trigger the warning. If everything appears secure, the next step is to utilize an OBD-II scanner, which can be easily connected to the vehicle's diagnostic port. This tool will allow you to retrieve specific error codes that the vehicle's computer has logged, providing insight into the underlying issue. Once you have the error codes, take the time to research their meanings, either through the vehicle's manual or reputable online resources, to better understand the problem at hand. If the codes point to a more complex issue that you cannot resolve on your own, it may be wise to consult a mechanic for professional assistance. By following this methodical approach, you can effectively diagnose the check engine light and take appropriate action to address any issues.

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

When the check engine light comes on in your 2021 Kia Sportage, it can be a source of concern, but understanding the common problems that may cause this warning can empower you to take action. One frequent culprit is a loose gas cap, which is an easy fix that can often be overlooked. Another common issue is a faulty oxygen sensor, which not only affects your vehicle's emissions but can also lead to decreased fuel efficiency. If you notice a drop in performance, it might be worth checking the spark plugs, as worn or faulty ones can cause misfires and trigger the light. Additionally, problems with the catalytic converter or mass airflow sensor can significantly impact engine performance and should be inspected if the light remains illuminated. Ignition coil issues and engine misfires are also potential causes, often linked to the ignition system's health. Lastly, don't forget to consider the EGR valve, as malfunctions here can also lead to the check engine light turning on. Addressing these issues promptly is crucial to maintaining your vehicle's performance and preventing further damage, so if you're comfortable with DIY repairs, start by checking the simpler problems before seeking professional help for more complex issues.

How urgent is it to address the check engine light in a 2021 Kia Sportage?

When the check engine light illuminates in your 2021 Kia Sportage, it is essential to recognize the urgency of the situation. This warning light is not merely a nuisance; it indicates that there may be underlying issues with your vehicle's engine or emissions system that require immediate attention. Ignoring this signal can lead to a cascade of problems, including reduced fuel efficiency and potential engine damage, which could result in costly repairs. Moreover, some issues may pose safety risks while driving, making it crucial to act swiftly. By having your vehicle inspected by a qualified mechanic as soon as the light comes on, you can diagnose the problem early and take the necessary steps to ensure your vehicle remains safe and reliable. Addressing the check engine light promptly not only protects your investment but also contributes to the overall longevity and performance of your Kia Sportage.

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