2025 Ford Mustang Has A Check Engine Light

Troubleshooting the Check Engine Light in Your 2025 Ford Mustang: Common 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 2025 Ford Mustang 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 2025 Ford Mustang 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.

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 steps to diagnose the check engine light on a 2025 Ford Mustang?

When faced with a check engine light on your 2025 Ford Mustang, the first step is to conduct a thorough visual inspection. Start by checking the gas cap; ensure it is securely tightened and free from damage, as a faulty gas cap is a common culprit for triggering the light. Next, utilize an OBD-II diagnostic scanner to read the error codes stored in your vehicle's computer. This tool is invaluable, as it provides specific codes that can point you toward the underlying issue. After retrieving the codes, consult your owner's manual for detailed explanations and recommended actions based on the codes you find. Additionally, inspect the levels of essential fluids such as oil, coolant, and transmission fluid, as low levels can also activate the check engine light. Finally, pay attention to any other warning lights on your dashboard, as they may offer further insights into the problem. By following these initial steps, you can effectively narrow down the potential causes of the check engine light and take informed actions toward resolving the issue.

What are the common problems that could cause the check engine light to come on in a 2025 Ford Mustang?

When the check engine light comes on in a 2025 Ford Mustang, it can signal a range of potential issues that require immediate attention. One of the most common reasons is a loose gas cap, which can allow fuel vapors to escape and trigger the warning light. Another frequent culprit is a faulty oxygen sensor, which can disrupt the engine's air-fuel mixture, leading to decreased fuel efficiency and increased emissions. Additionally, problems with the catalytic converter, such as clogs or failures, can significantly affect engine performance and activate the check engine light. Misfires due to faulty spark plugs or ignition coils are also prevalent, as they can result in poor engine performance. A malfunctioning mass airflow sensor can further complicate the situation by impacting the air-fuel mixture, while issues with the Exhaust Gas Recirculation (EGR) valve can lead to reduced fuel efficiency. Transmission problems, including low fluid levels or sensor malfunctions, may also trigger the light. Lastly, malfunctions in the electronic control module (ECM) can cause various engine function issues, requiring diagnostic testing to identify the specific problem. It is crucial to address these issues promptly to prevent further damage and ensure the Mustang operates at its best.

How urgent is it to address the check engine light in a 2025 Ford Mustang?

When the check engine light illuminates in your 2025 Ford Mustang, it is crucial to act swiftly to prevent further complications. This warning signal often indicates underlying issues with the engine or emissions system that, if left unchecked, could escalate into more severe problems, potentially jeopardizing your vehicle's performance and safety. Ignoring this light may lead to costly repairs or even a breakdown, which can be inconvenient and dangerous. By addressing the check engine light promptly, you can identify minor issues that are often easy to fix, thereby avoiding extensive damage and ensuring your Mustang remains reliable on the road. For DIY enthusiasts, this means taking the time to diagnose the problem, whether through an OBD-II scanner or consulting reliable resources, to maintain the vehicle's efficiency and longevity. Prioritizing this task not only enhances your driving experience but also safeguards your investment in your Mustang.

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