2025 Mazda CX-90 Has A Check Engine Light

Common Causes for the Check Engine Light in Your 2025 Mazda CX-90 and How to Resolve Them

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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 2025 Mazda CX-90 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 Mazda CX-90 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 diagnostic steps to take when the check engine light is on in a 2025 Mazda CX-90?

When the check engine light illuminates in your 2025 Mazda CX-90, it's essential to approach the situation methodically to pinpoint the issue. Begin by examining the dashboard for any additional warning lights, as they may offer further insights into the problem. A common yet often overlooked culprit is the gas cap; ensure it is securely tightened, as a loose cap can easily trigger the check engine light. Next, inspect the oxygen sensor, which plays a crucial role in monitoring exhaust emissions; a malfunctioning sensor can lead to warning lights. Utilizing an OBD-II scanner is a vital step in this process, as it allows you to retrieve diagnostic trouble codes (DTCs) that provide specific information about the underlying issue. Additionally, check the levels of essential fluids like oil and coolant, as low levels can also activate the check engine light. Lastly, assess the condition of your battery, since a weak battery can sometimes be the source of the warning. By following these steps, you can gather valuable information to help diagnose the issue effectively and take appropriate action.

What are the common problems that could cause the check engine light to illuminate in a 2025 Mazda CX-90?

When the check engine light comes on in your 2025 Mazda CX-90, it can be a source of concern, but understanding the common problems that may cause this warning can empower you to take action. One of the simplest issues to check is the gas cap; if it’s loose or damaged, tightening or replacing it might resolve the problem. Another frequent culprit is the oxygen sensor, which, if faulty, can lead to poor fuel efficiency and should be tested for proper function. Additionally, keep an eye on the catalytic converter, as any inefficiencies or failures here can trigger the light as well. Spark plugs are also critical; worn or faulty plugs can affect engine performance and may need replacement. The mass airflow sensor is another component to consider, as its malfunction can disrupt the air-fuel mixture, leading to the check engine light illuminating. Ignition coil issues can cause engine misfires, which are often indicated by the light, while problems with the EGR valve can also be a factor. If you notice the check engine light on your dashboard, it’s wise to start with these common issues, as addressing them early can save you from more significant repairs down the line.

How urgent is it to address the check engine light in a 2025 Mazda CX-90?

Addressing the check engine light in a 2025 Mazda CX-90 is of utmost importance due to the potential risks associated with ignoring this warning. The check engine light is not just a minor inconvenience; it signals that there may be underlying issues with the engine or emissions system that could escalate into more severe problems if left unaddressed. Ignoring this alert can lead to significant engine damage, resulting in costly repairs that could have been avoided with timely intervention. Moreover, modern vehicles are equipped with advanced diagnostic systems that can help identify the specific issues causing the light to illuminate, making it easier for DIY enthusiasts to troubleshoot and resolve problems efficiently. Continuing to drive with the check engine light on can also lead to decreased fuel efficiency and poor vehicle performance, which not only affects your wallet but also contributes to increased emissions, harming the environment. Therefore, it is crucial to take the check engine light seriously and seek a professional diagnosis as soon as possible to ensure the longevity and optimal performance of your Mazda CX-90.

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