2014 Ford Mustang Has A Check Engine Light

Check Engine Light Issues in 2014 Ford Mustang and Their Resolutions

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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 2014 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 2014 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.

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 steps to diagnose the check engine light on a 2014 Ford Mustang?

When diagnosing the check engine light on a 2014 Ford Mustang, it's essential to adopt a systematic diagnostic approach that prioritizes simpler solutions before delving into more complex issues. Start by visually inspecting the vehicle for any obvious problems, such as a loose or damaged gas cap, which is a common trigger for the check engine light. Next, utilize an OBD-II scanner to connect to the car's onboard diagnostic system; this tool will help you retrieve any stored error codes that can pinpoint the underlying issue. Once you have the error codes, research them thoroughly to understand their implications and potential causes. Additionally, check basic components like the air filter, spark plugs, and battery to ensure they are functioning correctly, as these can often be the source of the problem. If these steps do not resolve the issue or if the diagnostics point to a more complicated problem, it may be wise to consult a professional mechanic for further assistance. By following this structured approach, you can effectively identify and address the reasons behind the check engine light, ensuring your Mustang runs smoothly.

What are the common problems that could cause the check engine light to illuminate in a 2014 Ford Mustang?

When the check engine light comes on in a 2014 Ford Mustang, it can be a source of concern for any DIY car owner. One of the most straightforward issues to check is the gas cap; a loose or damaged cap can easily trigger the light due to its role in the vehicle's evaporative emissions system. If the gas cap is secure, the next step is to consider the oxygen sensor, which, if faulty, can lead to poor fuel efficiency and increased emissions. Another critical component to inspect is the catalytic converter, as problems here can significantly affect the vehicle's emissions control. Additionally, issues with spark plugs or ignition coils can cause engine performance problems, leading to the light illuminating. A malfunctioning mass airflow sensor can also disrupt the air-fuel mixture, impacting overall engine performance. Lastly, engine misfires and EGR valve issues are common culprits that can trigger the check engine light, necessitating prompt attention to maintain engine health. By systematically checking these components, DIY enthusiasts can effectively diagnose and address the underlying issues, ensuring their Mustang runs smoothly.

How urgent is it to address the check engine light in a 2014 Ford Mustang?

When the check engine light illuminates in your 2014 Ford Mustang, it signals an urgent need for attention. This warning can stem from a variety of issues, ranging from minor concerns like a loose gas cap to more serious problems such as a malfunctioning oxygen sensor or faulty ignition coils. Ignoring this light can lead to escalating issues that may compromise your engine's performance and efficiency, potentially resulting in costly repairs down the line. Moreover, in many jurisdictions, a lit check engine light can lead to automatic failure during emissions testing, hindering your ability to register your vehicle. Therefore, it is crucial to diagnose and resolve the underlying problem as soon as possible to maintain your Mustang's reliability and compliance with regulatory standards. Taking prompt action not only safeguards your vehicle's health but also ensures your safety on the road.

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2014 Ford Mustang Check Engine Light Causes & Solutions