2018 Kia Sportage Has A Check Engine Light

Common Causes of the Check Engine Light in Your 2018 Kia Sportage and How to Resolve Them

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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 2018 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 2018 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 diagnostic steps to take for a check engine light on a 2018 Kia Sportage?

When faced with a check engine light on your 2018 Kia Sportage, it's essential to adopt a methodical diagnostic approach. Start by checking the gas cap; a loose or damaged cap is a common culprit that can easily trigger the light. Next, examine your dashboard for any additional warning indicators that might offer further insights into the issue. Utilizing an OBD-II scanner is a crucial step, as it allows you to retrieve specific error codes that can direct you to the underlying problem. After that, inspect the spark plugs for wear or damage, as faulty plugs can also cause the light to illuminate. Additionally, ensure that all essential fluid levels—such as oil, coolant, and transmission fluid—are adequate, as low levels can lead to engine complications. Finally, take a moment to inspect the wiring and connections under the hood for any signs of damage or corrosion, as these can also trigger the check engine light. By following these steps, you can effectively narrow down the potential causes of the check engine light and take appropriate action to resolve the issue.

What are the common problems that could cause the check engine light to illuminate in a 2018 Kia Sportage?

When the check engine light comes on in a 2018 Kia Sportage, it can be a source of concern for any DIY enthusiast. Understanding the common problems that may trigger this warning can help you diagnose the issue effectively. One of the simplest culprits is a loose gas cap, which can lead to fuel vapors escaping and is easily fixable by ensuring the cap is tightened properly. More complex issues may involve the oxygen sensor, which plays a crucial role in managing fuel efficiency and emissions; a faulty sensor can significantly impact your vehicle's performance. Additionally, problems with the catalytic converter can also illuminate the check engine light, indicating a failure or inefficiency that may require professional attention. The mass airflow sensor is another critical component; if it malfunctions, it can disrupt the air-fuel mixture, leading to engine performance issues. Furthermore, faulty spark plugs or ignition coils can cause engine misfires, triggering the light as well. Lastly, issues with the EGR valve can affect both engine performance and emissions, making it another potential reason for the warning light. By familiarizing yourself with these common problems, you can take the first steps toward troubleshooting and potentially resolving the issue on your own.

How urgent is it to address the check engine light in a 2018 Kia Sportage?

When the check engine light illuminates in your 2018 Kia Sportage, it is crucial to recognize the urgency of the situation. This warning light is not merely a nuisance; it indicates that your vehicle's engine or emissions system may be experiencing issues that could range from minor to severe. Ignoring this signal can lead to a cascade of problems, including decreased fuel efficiency and potential engine damage, which could result in costly repairs. Moreover, some issues may pose safety risks, making it imperative to act swiftly. By seeking professional diagnosis and repair as soon as the light comes on, you can address any underlying problems before they escalate, ensuring your vehicle remains safe and efficient on the road. Prioritizing this issue not only protects your investment but also contributes to your overall driving safety.

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