2016 Mazda CX-5 Has A Check Engine Light

Common Causes of the Check Engine Light in Your 2016 Mazda CX-5 and How to Resolve Them

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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 2016 Mazda CX-5 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 2016 Mazda CX-5 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 2016 Mazda CX-5?

When faced with a check engine light on your 2016 Mazda CX-5, it's essential to adopt a systematic diagnostic approach. Start by checking the gas cap, as a loose or damaged cap is a common and easily fixable culprit that can trigger the light. Next, take a moment to inspect your dashboard gauges for any additional warning lights or unusual readings that might indicate other underlying issues. A visual inspection under the hood can also be beneficial; look for any signs of wear or damage to wires and hoses that could affect vehicle performance. If these initial checks do not resolve the issue, using an OBD-II scanner can provide specific error codes that pinpoint the problem, allowing for a more targeted approach to repairs. Additionally, consulting your owner's manual can offer insights into the meaning of these codes and suggest potential solutions. If the problem persists or appears too complex, seeking help from a qualified mechanic is advisable to ensure your vehicle is properly diagnosed and repaired. By following these steps, you can effectively troubleshoot the check engine light and maintain your Mazda CX-5's performance.

What are the common problems that could cause the check engine light to illuminate in a 2016 Mazda CX-5?

When the check engine light comes on in your 2016 Mazda CX-5, it can be a source of concern, but understanding the common problems can help you diagnose the issue. One frequent culprit is a loose gas cap, which can easily be checked and tightened. Another common issue is a faulty oxygen sensor, which affects fuel efficiency and may require replacement if identified. Additionally, problems with the catalytic converter can lead to significant performance issues, so it's essential to monitor any unusual engine behavior. A dirty or malfunctioning mass airflow sensor can also trigger the light, indicating that it may need cleaning or replacement. Furthermore, issues with spark plugs or ignition coils can cause engine misfires, leading to the check engine light illuminating. A faulty thermostat can result in overheating, while an engine misfire can stem from various factors, including bad spark plugs or fuel injectors. If you encounter the check engine light, it's advisable to conduct a thorough inspection of these components, as addressing these common problems early can prevent more severe damage and costly repairs.

How urgent is it to address the check engine light in a 2016 Mazda CX-5?

When the check engine light illuminates in your 2016 Mazda CX-5, it is crucial to recognize the urgency of the situation. This warning light is not merely a nuisance; it signifies that your vehicle's engine or emissions system may be experiencing issues that could escalate if left unaddressed. While some triggers, like a loose gas cap, may seem trivial, others could indicate serious mechanical failures that could compromise your vehicle's performance and safety. Ignoring the check engine light can lead to more severe problems, including engine damage or increased emissions, which could result in costly repairs and potential safety hazards. Therefore, it is advisable to have your vehicle diagnosed by a qualified mechanic as soon as possible. Prompt action not only helps maintain the reliability of your Mazda CX-5 but also ensures your safety on the road, making it essential to take the check engine light seriously.

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