Mercedes-Benz GLS63 AMG Has A Check Engine Light

Common Causes for the Check Engine Light in Your Mercedes-Benz GLS63 AMG and How to Resolve Them

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Reviewed by
Andrew Hajjar
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 Mercedes-Benz GLS63 AMG 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 GLS63 AMG 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 Check Engine Light in a Mercedes-Benz GLS63 AMG

When faced with a Check Engine Light in your Mercedes-Benz GLS63 AMG, the first step is to diagnose the issue accurately. Begin by using an OBD-II scanner to read the trouble codes stored in your vehicle's computer system. This tool can provide valuable insights into the specific fault triggering the light, allowing you to focus your efforts on the most likely causes. If you don't have a scanner, you can also try disconnecting the negative battery cable for a few minutes, which may reset the light temporarily. However, this should only be a stopgap measure, as the underlying issue must be resolved to prevent the light from reappearing. After identifying the problem, address it accordingly—whether it involves replacing a faulty sensor, tightening a loose gas cap, or more complex repairs. Once the issue is fixed, you can reset the Check Engine Light using the scanner or by reconnecting the battery. If the light persists or if you encounter performance issues, such as reduced power or unusual noises, it’s wise to consult a professional mechanic. Taking these steps not only helps maintain your vehicle's performance but also ensures your safety on the road.

What Could Cause the Check Engine Light to Illuminate in a Mercedes-Benz GLS63 AMG?

When the check engine light comes on in your Mercedes-Benz GLS63 AMG, it can signal a range of issues that may require your attention. Common problems include a faulty oxygen sensor, which can lead to reduced fuel efficiency and engine performance issues like misfiring or hesitation. Other potential culprits are malfunctioning sensors within the emissions system or problems with the catalytic converter. If the light is flashing, it indicates a more serious issue that demands immediate attention to prevent further damage to your vehicle. While some problems may be easily resolved, such as tightening a loose gas cap, others may require a diagnostic test to accurately identify the underlying cause. Many service centers provide complimentary inspections, allowing you to diagnose the issue without incurring significant costs. If you experience a noticeable decline in performance along with the illuminated light, it’s crucial to seek the expertise of a professional technician to ensure your vehicle operates smoothly and efficiently.

Why is the Check Engine Light On in a Mercedes-Benz GLS63 AMG?

When the check engine light illuminates in your Mercedes-Benz GLS63 AMG, it serves as a critical alert that should not be overlooked. Ignoring this warning can lead to severe consequences, including diminished vehicle performance, increased emissions, and potentially costly repairs down the line. Common culprits behind this warning include a loose gas cap, which is a simple fix, but also more complex issues such as a faulty oxygen sensor or spark plugs that may require professional attention. Additionally, problems with the catalytic converter can significantly impact your vehicle's efficiency and emissions control. Given the sophisticated nature of modern vehicles, it is essential to address these symptoms promptly to avoid further damage and ensure your safety on the road. If the check engine light is on, consider having your vehicle diagnosed by a qualified technician to pinpoint the issue and take appropriate action.

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