Ford Ranger Has A Check Engine Light

Troubleshooting Common Causes for the Check Engine Light in Your Ford Ranger and How to Resolve Them

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Reviewed by
Aisha
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 Ford Ranger 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 Ford Ranger 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 Ford Ranger

When faced with a check engine light in your Ford Ranger, it's essential to adopt a systematic diagnostic approach to identify and resolve the issue efficiently. Start by checking for any obvious problems, such as loose gas caps or visible leaks, as these can often trigger the light. If no immediate issues are apparent, the next step is to pull the trouble codes using an OBD-II scanner, which can provide specific insights into what might be malfunctioning. Once you have the codes, research their meanings to understand the underlying problems. If the codes indicate a minor issue, such as a sensor malfunction, you may be able to reset the light by disconnecting the battery or using the scanner to clear the codes. However, if the codes point to more serious concerns, such as engine misfires or emissions failures, it's crucial to address these problems promptly to prevent further damage. By following this structured approach, you can effectively troubleshoot the check engine light in your Ford Ranger, ensuring your vehicle remains in optimal condition while saving on potential repair costs.

What Could Cause the Check Engine Light to Illuminate in a Ford Ranger?

When the check engine light comes on in your Ford Ranger, it can be a source of concern, but understanding the common problems can empower you to take action. One frequent culprit is a faulty emissions system component, which can include sensors or the catalytic converter. A loose or damaged gas cap is another simple yet often overlooked issue that can lead to leaks in the evaporative emissions system, triggering the light. Additionally, a malfunctioning oxygen sensor is a prevalent cause that not only activates the warning light but can also affect your vehicle's fuel efficiency and performance, leading to symptoms like rough idling or engine misfires. If you notice your Ranger struggling to run smoothly, it could indicate a misfiring engine or a failing catalytic converter. Addressing these issues promptly is crucial, as neglecting them can lead to more severe damage and costly repairs down the line. By being aware of these common problems, you can take the first steps toward diagnosing and resolving the issue yourself.

Why is the Check Engine Light On in a Ford Ranger?

When the Check Engine Light illuminates in your Ford Ranger, it serves as a crucial warning that should not be ignored. The light can signify a range of issues, from a simple loose gas cap to more severe problems like a failing catalytic converter. Ignoring these warnings can lead to more significant engine damage, decreased fuel efficiency, and even safety hazards while driving. For instance, a faulty oxygen sensor can cause your engine to run irregularly, potentially leading to misfires that compromise vehicle performance. Additionally, issues with the ignition cylinder can disrupt engine operation, making it essential to address these symptoms promptly. By taking immediate action to diagnose and resolve the underlying problems, you not only ensure the longevity of your vehicle but also maintain safe driving conditions. If you've fixed the issue, remember to reset the Check Engine Light by disconnecting the battery for 30 seconds, ensuring that your dashboard reflects the true status of your vehicle's health.

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