2021 Mercedes-Benz AMG GT 63 Has A Check Engine Light

Check Engine Light Issues in 2021 Mercedes-Benz AMG GT 63: Causes and Solutions

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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 Mercedes-Benz AMG GT 63 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 Mercedes-Benz AMG GT 63 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 2021 Mercedes-Benz AMG GT 63?

When faced with a check engine light on your 2021 Mercedes-Benz AMG GT 63, it's essential to approach the diagnosis methodically. Start by visually inspecting the gas cap, as a loose or damaged cap is a common and easily fixable issue that can trigger the light. Next, utilize an OBD-II scanner to connect to your vehicle's diagnostic port; this tool will help you retrieve specific error codes that indicate the nature of the problem. Additionally, check the levels of essential fluids like engine oil, coolant, and transmission fluid, as low levels can also cause the check engine light to activate. Don’t overlook the battery; ensure it is in good condition and properly connected, since a weak battery can lead to warning lights. Finally, pay attention to any other warning lights or unusual symptoms your vehicle may display, as these can provide further clues to the underlying issue. By following these steps, you can effectively narrow down the cause of the check engine light and take appropriate action.

What are the common problems that could cause the check engine light to illuminate in a 2021 Mercedes-Benz AMG GT 63?

When the check engine light illuminates in a 2021 Mercedes-Benz AMG GT 63, it serves as a crucial alert that something may be amiss under the hood. Common issues that could trigger this warning include a loose gas cap, which is often a simple fix but can lead to more significant problems if ignored. More serious concerns might involve a faulty oxygen sensor, which is essential for regulating fuel efficiency and emissions. Additionally, the catalytic converter can develop issues that affect its efficiency, leading to the check engine light activation. Worn spark plugs can also cause performance issues, while a malfunctioning mass airflow sensor can disrupt the air-fuel mixture necessary for optimal engine operation. Other potential causes include faulty ignition coils, which can lead to engine misfires, and problems with the Exhaust Gas Recirculation (EGR) valve, which can impact emissions control. It’s important to address these issues promptly to maintain your vehicle's performance and prevent further damage, so if the check engine light comes on, consider having your vehicle inspected by a qualified mechanic to diagnose and resolve the underlying problem effectively.

How urgent is it to address the check engine light in a 2021 Mercedes-Benz AMG GT 63?

Addressing the check engine light in your 2021 Mercedes-Benz AMG GT 63 is not just a matter of convenience; it is a critical step in ensuring the longevity and performance of your vehicle. Ignoring this warning can lead to a cascade of issues, including reduced fuel efficiency and compromised engine performance, which may escalate into more severe mechanical failures. The sophisticated onboard diagnostics in modern vehicles can help identify the specific problem, but it is essential to act quickly. Delaying inspection could result in costly repairs and even safety risks, as certain engine malfunctions can affect vehicle handling and emissions. For DIY enthusiasts, understanding the urgency of this warning light is vital; it encourages proactive maintenance and empowers you to seek professional help when necessary. By addressing the check engine light promptly, you not only safeguard your investment but also enhance your driving experience.

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2021 Mercedes-Benz AMG GT 63 Check Engine Light Guide