2018 Kia Stinger Has A Check Engine Light

Troubleshooting the Check Engine Light in Your 2018 Kia Stinger: 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 2018 Kia Stinger 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 Stinger 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 2018 Kia Stinger?

To effectively diagnose the check engine light on your 2018 Kia Stinger, start with a thorough visual inspection of the vehicle. Begin by checking the gas cap; ensure it is securely tightened and free from damage, as a loose or faulty gas cap is a common trigger for the check engine light. If the gas cap is in good condition, the next step involves using a diagnostic scanner. Connect the scanner to the OBD-II port, typically located under the dashboard, to retrieve any error codes stored in the vehicle's computer system. Once you have the codes, take the time to interpret them, as they will provide insight into the specific issues affecting your vehicle. Research these codes using your vehicle's manual or reputable online resources to understand their implications. Finally, based on the information gathered, address the identified issues, which may involve simple fixes like replacing a sensor or more complex repairs. By following this methodical approach, you can effectively diagnose and resolve the check engine light concern, ensuring your Kia Stinger runs smoothly.

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

When the check engine light illuminates in a 2018 Kia Stinger, it can signal a range of common issues that may require your attention. One frequent culprit is a loose gas cap, which can disrupt the vehicle's evaporative emissions system, leading to the light turning on. Another potential issue is a faulty oxygen sensor, which not only affects fuel efficiency but also increases emissions, prompting the onboard diagnostics to alert you. Problems with the catalytic converter can also trigger the check engine light, as this component is essential for minimizing harmful emissions. Additionally, a malfunctioning mass airflow sensor can disrupt the air-fuel mixture, impacting engine performance. Worn or faulty spark plugs and ignition coils can lead to engine misfires, further illuminating the check engine light. Engine vacuum leaks and a malfunctioning thermostat are other issues that can affect engine performance and efficiency, making it crucial to address them promptly. If you encounter the check engine light, it’s advisable to conduct a thorough inspection or consult a qualified mechanic to diagnose and resolve the underlying problem effectively.

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

When the check engine light illuminates in your 2018 Kia Stinger, it signals a potential issue that requires immediate attention. Ignoring this warning can lead to a cascade of problems, including reduced fuel efficiency and compromised engine performance. For DIY enthusiasts, the first step is to use an OBD-II scanner to retrieve diagnostic trouble codes, which can provide insight into the specific issue at hand. This proactive approach not only helps in identifying the problem but also allows you to gauge the severity of the situation. If the codes indicate a minor issue, you may be able to perform simple repairs yourself, such as replacing a faulty sensor or tightening a loose gas cap. However, if the codes suggest a more serious malfunction, such as engine misfires or emissions system failures, it is crucial to consult a qualified mechanic. Addressing the check engine light promptly not only safeguards your vehicle's performance but also prevents potentially costly repairs down the line, making it essential for any DIYer to take this warning seriously.

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2018 Kia Stinger Check Engine Light Guide | RepairPal