When should I replace spark plugs on my Acura MDX?

For most Acura MDX models, plan to replace spark plugs around 105,000 miles if your engine uses long-life iridium or platinum plugs; copper plugs are typically due around 60,000 miles. Always verify the exact interval in your owner's manual or with your dealer, as recommendations can vary by year and plug type.

In practice, the replacement timeline depends on the plug material, your driving conditions, and the specific MDX generation. This guide outlines typical schedules, factors that can shorten or extend those intervals, and practical steps for diagnosing when a replacement is due.

Typical intervals by plug material

Overview

Before you rely on a mileage figure, know that the replacement interval is closely tied to the type of spark plug installed or recommended by Acura for your MDX. The following ranges reflect common factory guidance for modern MDX models and may vary by year.

• Copper spark plugs: generally around 60,000 miles (approximately 97,000 kilometers) under normal driving; sooner if you drive under severe conditions.


• Iridium or platinum long-life plugs: commonly around 105,000 miles (about 168,000 kilometers) under normal driving; check the exact specification for your year and trim.

The precise interval for your vehicle should come from the maintenance schedule in your owner's manual or the Acura service information for your model year. If your MDX uses a different plug type, follow that plug’s recommended interval.

How driving conditions can affect timing

Driving style and environmental conditions can shorten or extend the life of spark plugs. Severe service conditions—such as frequent short trips, heavy city traffic, towing, extreme temperatures, or dusty environments—tend to wear plugs faster.

• Severe service or frequent short trips: replacement may be needed as early as 30,000–60,000 miles for copper plugs; long-life plugs may still be targeted around 105,000 miles depending on the model, but inspections are advised sooner.


• Normal highway driving with steady loads: you might approach the higher end of the published interval for the installed plug type.

Because conditions vary, many owners opt to have the maintenance minder or an annual inspection guide their replacement timing rather than relying on mileage alone.

Signs that your spark plugs may need replacement sooner

Beyond the scheduled interval, look for symptoms that suggest worn or failing plugs. Responding early can prevent further engine stress and fuel economy loss.

• Rough idle, engine misfires, or reduced acceleration


• Poor fuel economy or noticeable power drop during acceleration


• Difficulty starting the engine or a persistent check engine light with misfire codes (P0300–P0306)


• Unusual engine noises or hesitation under load

If you notice any of these symptoms, have the spark plugs inspected and replace them if indicated, even if you’re not exactly at the mileage milestone.

DIY versus professional replacement

Replacing spark plugs on an MDX can be a manageable DIY project for a mechanically inclined owner, but it requires proper tools, correct plug type, and attention to torque and gapping. Many MDX owners prefer professional service to ensure correct installation and to check related components (such as coil-on-plug boots) for wear.

• Consider professional service if you’re unsure about the plug type, torque specs, or coil boot condition.


• When replacing yourself, use OEM-recommended plugs, inspect coil packs and boots, and torque plugs to the manufacturer’s specifications to avoid cross-threading or leaks.

Regardless of who does the work, ensure the final check includes a test run to confirm smooth operation and no misfires.

Summary

In short, most MDX models equipped with long-life iridium or platinum plugs are slated for replacement around 105,000 miles under normal conditions, while copper plugs typically require changes around 60,000 miles. Driving conditions, maintenance history, and the exact model year can modify these intervals, so always consult the owner’s manual and the dealer’s maintenance schedule for your specific vehicle. Stay alert for signs of wear, and don’t hesitate to replace sooner if symptoms appear or the maintenance minder indicates an upcoming service.

What year to stay away from Acura MDX?

You should generally avoid the 2001, 2003, 2004, 2010, and 2014 Acura MDX models due to recurring issues with their transmissions and other systems. Additionally, some 2016–2020 models with the 9-speed transmission had shift issues. Years to consider for better reliability are 2007–2009 and 2017 and later. 
Years to avoid

• 2001, 2003, 2004: These years are frequently mentioned for transmission problems. 
• 2010: This year is cited for transmission issues and potential oil burning problems. 
• 2014: Cited for transmission problems and user-unfriendly infotainment systems. 
• 2016–2020: Models from this range, especially those with the 9-speed transmission, can have shifting issues. 

Years to consider

• 2007–2009: These are noted as being among the more reliable models in the second generation. 
• 2017 and later: These models are generally considered more reliable, with improved technology and performance. 
• 2022 and newer: The new generation is showing positive early reliability and has an improved 10-speed transmission. 

How much does it cost to replace spark plugs in a Acura MDX?

The average cost for an Acura MDX Spark Plug Replacement is between $386 and $443.

What is the 60000 mile service on a MDX?

Every 60,000 miles
Major service items that often appear around 60,000 miles include inspecting or replacing components where applicable, servicing the cooling system, and considering a full brake fluid flush. If your MDX has AWD or SH-AWD, check and service the transfer case and differential fluids.

How often should I change the spark plugs on my Acura MDX?

The Acura MDX spark plug replacement interval is typically around 100,000 to 105,000 miles, as indicated by the "4" maintenance minder code, though this can vary by model year and driving conditions. Older models might have a 30,000-mile interval, so it is crucial to consult your owner's manual for the specific schedule of your vehicle. 
General guidelines

• 100,000 to 105,000 miles: This is the most common replacement interval for modern MDX models, which are equipped with long-life iridium spark plugs. 
• Maintenance Minder Code 4: Your vehicle's maintenance minder will likely display a "4" code to indicate it's time for spark plug replacement. 
• Owner's manual: The most accurate information for your specific vehicle will be in its owner's manual. Different model years and trims have different service schedules. 
• Older models: Some sources suggest a 30,000-mile interval for older models, but this is not the standard for newer ones. Always verify the correct interval for your vehicle. 

Why replacement is important
Replacing spark plugs at the correct interval helps prevent potential problems like: Misfiring engine, Rough idling, Reduced fuel economy, Poor acceleration, and Difficulty starting the engine.