Mercedes-Benz C63 AMG S Has A Check Engine Light

Common Causes for the Check Engine Light in Your Mercedes-Benz C63 AMG S and How to Resolve Them

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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 Mercedes-Benz C63 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 Mercedes-Benz C63 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.

Troubleshooting the Check Engine Light in a Mercedes-Benz C63 AMG S

When troubleshooting the Check Engine Light in your Mercedes-Benz C63 AMG S, begin by locating the OBD plug, typically found under the dashboard near the steering column. This is your gateway to understanding the issue, as connecting an OBD scanner will allow you to read the trouble codes that illuminate the light. These codes provide crucial insights into potential problems, which can range from minor sensor issues to more significant engine faults. After retrieving the codes, take the time to research common causes associated with your specific model, as this can help narrow down the possibilities. Once you have a clearer picture of the issue, address the identified fault, whether it involves replacing a faulty sensor or fixing a more complex mechanical problem. After making the necessary repairs, ensure that your vehicle is in good condition before resetting the Check Engine Light; this typically involves turning the ignition to the On position without starting the engine. By following this structured approach, you can effectively diagnose and resolve the Check Engine Light issue, ensuring your C63 AMG S runs smoothly and efficiently.

What Could Cause the Check Engine Light to Illuminate in a Mercedes-Benz C63 AMG S?

When the Check Engine Light illuminates in your Mercedes-Benz C63 AMG S, 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 can disrupt the fuel system's pressure and trigger the light. Additionally, engine or fuel system issues, such as faulty sensors or fuel injectors, can lead to performance problems and should be investigated. Battery-related issues, particularly if your vehicle is experiencing starting difficulties, may also be a factor, indicating that a battery replacement could be necessary. Other potential causes include mechanical problems like rattling noises, persistent tire pressure warnings, braking noises, window malfunctions, oil leaks, or heater issues. By identifying these common problems, you can take the first steps toward diagnosing and resolving the issue, ensuring your vehicle remains in optimal condition.

Why is the Check Engine Light On in a Mercedes-Benz C63 AMG S?

When the Check Engine Light illuminates in your Mercedes-Benz C63 AMG S, it serves as a critical warning that should not be ignored. While some issues, like a loose gas cap, may seem minor and easily fixable, others could indicate serious engine problems that require immediate attention. Ignoring these warnings can lead to more significant damage, increased repair costs, and even safety risks while driving. For DIY enthusiasts, it’s essential to understand that while you may be able to check simple issues, such as ensuring the gas cap is secure, more complex problems may necessitate professional diagnostics. Addressing the Check Engine Light promptly not only helps maintain your vehicle's performance but also ensures your safety on the road. Therefore, if the light remains on after checking the basics, consider seeking assistance from a qualified mechanic to prevent further complications.

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