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Mazda CX-9 DIY Maintenance & Repair Guides
Links to DIY repair guides and vehicle maintenance how-to tutorials for the 2nd generation 2016 to 2023 Mazda CX-9.

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Key Fob Battery Change

1. 2016 To 2023 Mazda CX-9 Key Fob Battery Replacement Guide

After a few years of daily use, the coin cell battery inside the "intelligent" or "smart" key fob remote control for the "Mazda Advanced Keyless Entry System" of a second generation 2016, 2017, 2018, 2019, 2020, 2021, 2022 & 2023 Mazda CX-9 SUV can become weak or stop working entirely.

To view the DIY tutorial for changing the battery (with the compatible replacement part number), click on the text link above or the thumbnail image on the left.

   

2016-2021 Mazda CX-9 Map Light Bulbs Replacement Guide
Map Light Bulbs Change

2. 2016 To 2023 Mazda CX-9 Map Light Bulbs Replacement Guide

If you need to change a burnt out map light bulb in the overhead console of your Mazda CX-9 (or upgrade them both to brighter LED units), check out the DIY tutorial for the procedure (with the compatible replacement part numbers) by clicking on the text link above or the thumbnail image on the left.

   

2016-2021 Mazda CX-9 Vanity Mirror Light Bulb Replacement Guide
Vanity Mirror Light Bulb

3. 2016 To 2023 Mazda CX-9 Vanity Mirror Light Bulb Replacement Guide

If you need to change a burnt out vanity mirror light bulb in the sun visor of your second generation 2016, 2017, 2018, 2019, 2020, 2021, 2022 and 2023 Mazda CX-9 SUV, take a look at the DIY instructions for the procedure (with the compatible replacement part number) by clicking on the text link above or the thumbnail image on the left.

   

2016-2021 Mazda CX-9 Dome Light Bulbs Replacement Guide
Dome Light Bulbs

4. 2016 To 2023 Mazda CX-9 Dome Light Bulbs Replacement Guide

If you need to change a burnt out dome light bulb (also known as the rear passenger courtesy reading light bulbs) in the light housing attached to the headliner of your Mazda CX-9, check out the DIY directions for the procedure (with the compatible replacement part number) by clicking on the text link above or the thumbnail picture on the left.

   


Cabin Air Filter Change

5. 2016 To 2023 Mazda CX-9 A/C Cabin Air Filter Replacement Guide

If the air conditioning system of your CX-9 hasn't been working well recently or the air coming out of the vents smells a bit musty or moldy, you probably need to clean or change the cabin air filter element located inside the HVAC blower motor housing.

To view the DIY tutorial for the procedure (with the compatible replacement part numbers), click on the text link above or the thumbnail image on the left.

   

2016-2021 Mazda CX-9 Plastic Interior Door Panels Removal Guide
Door Panel Removal

6. 2016 To 2023 Mazda CX-9 Interior Door Panels Removal Guide

If you'd like to upgrade the OEM door speakers in your CX-9, you'll first have to take off the plastic interior door panels.

Take a look at the DIY instructions for the procedure (with the compatible replacement aftermarket speaker sizes) by clicking on the text link or thumbnail image.

   

2016-2021 Mazda CX-9 Automatic Transmission Shift Lock Release Guide
Shift Lock Release

7. 2016 To 2023 Mazda CX-9 Gear Selector Shift Lock Release Guide

If you need to manually move your CX-9 due to a dead 12V battery or some other mechanical or electrical issue, you'll first have to release the shift lock mechanism.

This will allow you to move the gear selector from "P" (Park) to "N" (Neutral). Click on the text link or thumbnail image to view the DIY directions.

   

2016-2021 Mazda CX-9 Rear Window Wiper Blade Replacement Guide
Rear Wiper Blade

8. 2016 To 2023 Mazda CX-9 Rear Window Wiper Blade Replacement Guide

If you've been having difficulty seeing out of the back windshield window of your CX-9 when it is raining or snowing outside, you probably need to change the rear wiper blade.

To view the DIY directions for the procedure (with the OEM blade size and the compatible replacement part numbers) by clicking on the text link or thumbnail image.

   

2016-2021 Mazda CX-9 Rear Turn Signal Light Bulb Replacement Guide
Rear Turn Signal Bulb

9. 2016 To 2023 Mazda CX-9 Rear Turn Signal Light Bulb Replacement Guide

If you need to change a burnt out rear turn signal light bulb in the tail light housings of your Mazda CX-9 SUV, take a look at the DIY tutorial for the procedure (with the compatible replacement part number) by clicking on the text link above or the thumbnail image on the left.

   

2016-2021 Mazda CX-9 Reverse Light Bulbs Replacement Guide
Reverse Light Bulbs

10. 2016 To 2023 Mazda CX-9 Reverse Light Bulbs Replacement Guide

The reverse or "back-up" light bulbs on a CX-9 are contained in a separate housing attached to the tailgate door for the cargo area.

Check out the DIY instructions for the procedure (with the compatible replacement part number) by clicking on the text link above or the thumbnail image on the left.

   

2016-2021 Mazda CX-9 Cargo Area Light Bulb Replacement Guide
Cargo Area Light Bulb

11. 2016 To 2023 Mazda CX-9 Cargo Area Light Bulb Replacement Guide

If you need to change a burnt out cargo area light bulb in the light housing attached to the tailgate door of your CX-9, take a look at the DIY directions for the procedure (with the compatible replacement part number) by clicking on the text link above or the thumbnail image on the left.

   

2016-2021 Mazda CX-9 Windshield Window Wiper Blades Replacement Guide
Wiper Blades Change

12. 2016 To 2023 Mazda CX-9 Windshield Wiper Blades Replacement Guide

If you've been having difficulty seeing out of the front windshield window of your CX-9 when it's raining or snowing outside, you might need to change the wiper blades.

To view the DIY tutorial for the procedure (with the OEM blade size in inches and the compatible replacement part numbers), click on the text link or thumbnail image.

   


Electrical Fuse Change

13. 2016 To 2023 Mazda CX-9 Electrical Fuse & Relay Replacement Guide

The best place to start when troubleshooting any electrical problem with your CX-9 is to check for a blown fuse or a faulty relay in either the engine bay or the interior passenger compartment electrical panels.

Check out the DIY steps for the procedure (with the compatible replacement fuse types) by clicking on the text link above or the thumbnail image on the left.

   

2016-2021 Mazda CX-9 Engine Air Filter Replacement Guide
Engine Air Filter Change

14. 2016 To 2023 Mazda CX-9 2.5L I4 Engine Air Filter Replacement Guide

According to the 2019 CX-9 owner's manual, the engine air filter element for the Skyactiv-G turbocharged 2.5L I4 engine should be replaced every 22,500 miles (36,000 km) or every 36 months.

Take a look at the DIY instructions for the procedure (with the compatible replacement part numbers) by clicking on the text link above or the thumbnail image on the left.

   

2016-2021 Mazda CX-9 12V Automotive Battery Replacement Guide
12 Volt Car Battery

15. 2016 To 2023 Mazda CX-9 12V Automotive Battery Replacement Guide

If you've been having starting the engine in your CX-9 on a cold morning and the OEM battery is a few years old, you probably need to replace it.

To view the DIY tutorial for the procedure (with the OEM group size and the compatible replacement part numbers), click on the text link above or the thumbnail image on the left.

   

2016-2021 Mazda CX-9 Skyactiv-G Turbocharged 2.5L I4 Engine Spark Plugs Replacement Guide
Spark Plugs Change

16. 2016 To 2023 Mazda CX-9 Skyactiv-G 2.5L I4 Spark Plugs Replacement Guide

According to the owner's manual for the 2018 and 2019 Mazda CX-9 the OEM spark plugs in the Skyactiv-G turbocharged 2.5 liter inline four cylinder engine should be changed every 40,000 miles (or every 64,000 km).

Check out the DIY directions for the procedure (with the compatible replacement part numbers) by clicking on the text link above or the thumbnail image on the left.

   

2016-2021 Mazda CX-9 Mass Air Flow Sensor Replacement Guide
MAF Sensor Change

17. 2016 To 2023 Mazda CX-9 Mass Air Flow Sensor Replacement Guide

Just a few of the symptoms of a dirty, failing or faulty MAF (mass air flow) sensor may include hard starting, rough idling, hesitating, surging, poor acceleration, hiccups, low fuel economy (less MPG), stalling, a loss of power and possibly misfiring. You might also see a CEL / SES (check engine light / service engine soon warning) on the instrument gauge cluster. An OBDII scanner may reveal a MAF sensor related DTC (diagnostic trouble code) such as P0100, P0101, P0102, P0103 or P0104.

   

2016-2021 Mazda CX-9 Front Turn Signal & Side Marker Light Bulbs Replacement Guide
Front Turn Signal Bulb

18. 2016 To 2023 Mazda CX-9 Front Turn Signal & Front Side Marker Light Bulbs Replacement Guide

This 2019 CX-9 is equipped with LED headlights but the front turn signal and front side marker lights are traditional incandescent bulbs that will eventually burn out.

Take a look at the DIY tutorial for changing the light bulbs (with the compatible replacement part numbers) by clicking on the text link or thumbnail image.

   

2016-2021 Mazda CX-9 Manifold Absolute Pressure Sensor Replacement Guide
MAP Sensor Change

19. 2016 To 2023 Mazda CX-9 MAP Sensor Replacement Guide

Some of the symptoms of a dirty, failing or a faulty MAP sensor include low fuel economy (reduced MPG), a lack of power, failing your state's emissions test, a rough engine idle, hesitating, jerking and/or stalling. If you see a CEL (check engine light) or a SES (service engine soon) warning light on the gauge cluster, you can use an OBDII scan tool to check the DTC (diagnostic trouble codes). The OBD2 fault codes that may indicate a broken MAP sensor include P0105, P0106, P0107 or P0108.

   

2016-2021 Mazda CX-9 Skyactiv-G Turbocharged 2.5L I4 Engine Oil Change Guide
Turbo 2.5L Oil Change

20. 2016 To 2023 Mazda CX-9 Skyactiv-G 2.5L I4 Engine Oil Change Guide

The best way to keep your second generation 2016, 2017, 2018, 2019, 2020 and 2021 Mazda CX-9 running reliably for many years is to regularly change the motor oil and replace the oil filter on the Skyactiv-G 2.5 liter inline four cylinder engine.

According to the scheduled maintenance section in the owner's manual, the engine oil and filter should be changed at least every 7,500 miles (12,000 km) or at least once a year. You can also go by the oil life meter featured in the maintenance monitor system.

   

2016-2021 Mazda CX-9 Front Brake Pads Replacement Guide
Front Brake Pads

21. 2016 To 2023 Mazda CX-9 Front Brake Pads Replacement Guide

If you've been hearing a grinding, scraping, squealing or screeching sound coming from the front end of your CX-9 when you step on the brake pedal, you most likely need to change the front disc brake pads.

Check out the DIY tutorial for the procedure (with the compatible replacement part numbers) by clicking on the text link above or the thumbnail image on the left.

   

2016-2021 Mazda CX-9 Rear Brake Pads Replacement Guide
Rear Brake Pads (EPB)

22. 2016 To 2023 Mazda CX-9 Rear Disc Brake Pads Replacement Guide

The rear disc brake pads tend to last about twice as long as the front pads or anywhere from about 60,000 miles to over 100,000 miles depending on your unique driving conditions. This guide includes instructions for placing the EPB (electronic parking brake) in to service mode in order to retract the electric actuator motor.

To view the DIY directions for the procedure (with the compatible replacement part numbers) by clicking on the text link above or the thumbnail image on the left.

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