2012 BMW M6 Has A Check Engine Light

Troubleshooting the Check Engine Light in Your 2012 BMW M6: 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 2012 BMW M6 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 2012 BMW M6 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 2012 BMW M6?

When faced with a check engine light on your 2012 BMW M6, the first step is to retrieve the Diagnostic Trouble Codes (DTCs) using an OBD scanner, which will help pinpoint the specific issue triggering the warning. After obtaining the codes, check the gas cap to ensure it is securely tightened, as a loose cap can often cause the light to illuminate. If the light persists, conduct a visual inspection of the vehicle, looking for any damaged wires, hoses, or connectors that may indicate a problem. Additionally, pay attention to any accompanying symptoms such as unusual sounds or performance issues, as these can provide valuable clues for diagnosis. If these initial steps do not resolve the issue or if the problem appears complex, it is advisable to consult a qualified mechanic for a thorough inspection. By following this structured diagnostic approach, you can effectively address the check engine light and take the necessary steps toward resolution.

What are the common problems that could cause the check engine light to activate in a 2012 BMW M6?

When the check engine light illuminates in a 2012 BMW M6, it serves as a crucial alert that something within the vehicle's systems requires attention. One of the most straightforward issues to check is the gas cap; a loose or damaged cap can trigger the light due to fuel system pressure loss. If the cap is secure, it’s essential to consider potential electrical problems, such as faulty wiring or short circuits, which can be more complex to diagnose. Additionally, keep an eye out for other warning lights on the dashboard, such as those indicating transmission or power steering issues, as these can also correlate with the check engine light. Mechanical concerns, like a failing oil pump or drivetrain malfunctions, may also be at play, particularly in vehicles with higher mileage or those that have not been regularly maintained. Water leaks into the trunk area can lead to electrical problems, further complicating the situation. For DIY enthusiasts, while some issues may be easily identifiable, others may require professional diagnostic tools to pinpoint the exact cause. Addressing these problems promptly is vital to avoid more severe damage and ensure the longevity of your BMW M6.

How urgent is it to address the check engine light in a 2012 BMW M6?

When the check engine light illuminates in your 2012 BMW M6, it is crucial to assess the urgency of the situation. A steady light indicates a non-critical issue that should still be investigated, as it may affect your vehicle's performance and emissions. However, if the light is flashing, it signals a serious problem, such as an engine misfire, which requires immediate attention to prevent severe damage. Ignoring these warnings can lead to more significant issues down the line, resulting in costly repairs and compromising your vehicle's safety. Therefore, it is essential to prioritize addressing the check engine light, ensuring your BMW M6 operates efficiently and remains reliable on the road.

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2012 BMW M6 Check Engine Light Causes & Repair Costs