2016 Mercedes-Benz CLS63 AMG S Has A Check Engine Light

Resolve check engine light issues in 2016 Mercedes-Benz CLS63 AMG S.

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Reviewed by
Aisha
Written by RepairPal Car Genius
Updated January 14, 2025
0%
40% chance it's the
Emissions System
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60% chance it's
Something else
The most common reasons a 2016 Mercedes-Benz CLS63 AMG S 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 2016 Mercedes-Benz CLS63 AMG S 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 2016 Mercedes-Benz CLS63 AMG S?

When faced with a check engine light on your 2016 Mercedes-Benz CLS63 AMG S, it's crucial to follow a structured diagnostic approach to identify the underlying issue. Begin by inspecting visible components, particularly the gas cap, as a loose or damaged cap is a common trigger for the warning light. Next, connect an OBD-II scanner to the vehicle's diagnostic port; this device will provide specific error codes that can help you understand the problem more clearly. Additionally, check the levels of essential fluids such as engine oil, coolant, and transmission fluid, since low levels can also activate the check engine light. It's also important to examine the battery, ensuring that the terminals are clean and securely connected, as a weak battery can contribute to this warning. Pay attention to any other warning lights on the dashboard, as they may offer further insights into the issue. If these preliminary steps do not clarify the situation, seeking assistance from a qualified mechanic or an authorized Mercedes-Benz service center is advisable for a comprehensive diagnosis. By methodically addressing these areas, you can effectively gather the necessary information to resolve the check engine light concern.

What are the common problems that could cause the check engine light to illuminate in a 2016 Mercedes-Benz CLS63 AMG S?

When the check engine light comes on in a 2016 Mercedes-Benz CLS63 AMG S, it can be a source of concern for any car owner. Understanding the common problems that trigger this warning light is essential for effective DIY troubleshooting. One frequent culprit is a faulty oxygen sensor, which can lead to decreased fuel efficiency and increased emissions. Another simple issue to check is the gas cap; a loose or damaged cap can cause fuel vapors to escape, triggering the light. More complex problems may involve the catalytic converter, which can become clogged or fail, affecting exhaust flow and engine performance. Additionally, issues with spark plugs or ignition coils can lead to misfires, impacting engine operation. A malfunctioning mass airflow sensor can disrupt the air-fuel mixture, while problems with the exhaust gas recirculation (EGR) system can also affect performance. Lastly, transmission issues, such as low fluid levels, can trigger the check engine light as well. Addressing these issues promptly not only helps in maintaining optimal vehicle performance but also prevents potential long-term damage, making it crucial for DIY enthusiasts to stay informed and proactive.

How urgent is it to address the check engine light in a 2016 Mercedes-Benz CLS63 AMG S?

When the check engine light appears on your 2016 Mercedes-Benz CLS63 AMG S, it is crucial to take immediate action. This warning signifies that there may be underlying issues with the engine or emissions system, which, if ignored, can lead to significant performance declines, reduced fuel efficiency, and even severe engine damage. The complexity of modern vehicles means that what may start as a minor issue can quickly escalate into a costly repair if not addressed. Additionally, neglecting the check engine light can compromise the safety and reliability of your vehicle, as it may indicate problems with critical electronic systems. Therefore, it is essential to prioritize a professional inspection as soon as the light illuminates to ensure your vehicle remains in optimal condition and to avoid the risk of more extensive damage down the line.

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