A Deep Dive on Suspension Struts for the 2015-2019 Mazda 3
If your Mazda 3 is starting to feel bouncy or make clunking noises, it might be time for new struts or shocks.
- Your Mazda 3 uses struts in the front and shocks in the rear; they must be replaced in pairs (fronts or rears).
- A creaking noise from the front is likely a broken coil spring, as noted in Mazda TSB 02-005/19.
- KYB is a top choice for restoring the original OEM ride quality; Koni is an option for a performance upgrade.
- A wheel alignment is required after replacing the front struts to ensure safety and prevent tire damage.
Is It Time for New Struts?
Struts and shocks are wear items, typically lasting over 50,000 miles, but this can vary based on road conditions. Some Mazda 3 owners have reported the rear shocks leaking and failing earlier, sometimes around 25,000 miles. If you notice any of the symptoms below, it's time to inspect your suspension.
🎬 Watch: 5 symptoms of bad struts you should not ignoreKey Failure Symptoms
- Bouncy, Unstable Ride: The car feels floaty or bounces several times after hitting a bump.
- Clunking or Knocking Noises: You hear sounds from the suspension when driving over uneven roads. While this can be a strut, it's also commonly caused by worn sway bar links on these cars. 🎬 See how to diagnose suspension clunking and knocking sounds
- Nose-Diving: The front of the car dips down hard when you brake, or the rear squats when you accelerate.
- Visible Fluid Leaks: You see oil or greasy dirt caked onto the body of the strut or shock. A light film of oil can be normal, but an active leak means the part has failed.
- Uneven Tire Wear: Worn struts can cause a pattern of wear on your tires called "cupping," which looks like scalloped dips in the tread.
Known Issue: Front Coil Spring TSB
Mazda issued Technical Service Bulletin (TSB) 02-005/19 for 2014-2018 Mazda 3 models. It addresses a creaking noise from the front suspension caused by the coil spring breaking. According to the bulletin, mud and sand can get trapped in the lower spring seat, causing the spring to rust and eventually snap. If you hear a creaking sound over bumps, this is a likely cause.
Choosing the Right Aftermarket Strut
Your Mazda 3 has front struts and rear shocks, which are sold separately. It is critical to always replace these parts in pairs (both fronts or both rears) to ensure balanced handling. After replacing front struts, you must get a wheel alignment.
Brand Tiers for Your Mazda 3
- OEM-Quality Ride (KYB, Monroe): If you want to restore the original ride and handling, KYB is an excellent choice. They are a well-regarded OEM supplier, and their Excel-G line is designed to bring back factory performance. Monroe is another popular option for an OEM-like feel, though some drivers find them to be slightly softer than KYB.
- Performance Upgrade (Koni): For drivers who want enhanced handling and a sportier feel, Koni is a great option. Brands like Koni offer struts that are often firmer than stock, improving responsiveness at the cost of some ride comfort.
- Budget-Friendly (FCS): FCS is a brand that offers a lower-cost alternative. These can be a viable option if budget is the primary concern, but they may not offer the same longevity or ride quality as the more established brands.
Pro Tip: Consider a Complete Strut Assembly
For the front struts, you can buy a "complete strut assembly" or "quick-strut." This part includes the strut, coil spring, and mount all in one unit. It makes the replacement job much faster and safer because you don't need to use a dangerous spring compressor tool. This is highly recommended for DIYers.
🎬 Watch this walkthrough on replacing front strut and spring assembliesCost to Replace Mazda 3 Struts & Shocks
Prices can vary based on your location and the parts you choose. Here is an estimated breakdown for replacing a pair of front struts or rear shocks.
| Part | Cost (Parts Only) |
|---|---|
| New Aftermarket Struts/Shocks (Pair) | $130 - $600 |
| New OEM Struts/Shocks (Pair) | $230 - $340 |
| Shop Labor (Pair) | $150 - $350 |
Frequently Asked Questions
Are there any recalls for the 2015-2019 Mazda 3 suspension?
No, there are no active recalls specifically for the struts or shocks on the 2015-2019 Mazda 3.
Do I have to replace all four struts and shocks at the same time?
No, you don't have to replace all four at once. However, you must replace them in pairs—either both front struts or both rear shocks. Replacing only one side will cause unstable handling.
What's the difference between a strut and a shock on my Mazda 3?
Your Mazda 3 has MacPherson struts in the front and a separate shock/spring combination in the rear. A strut is a structural component that supports the car's weight, while a shock is simply a damper that controls spring movement. This is why front strut replacement is more involved than rear shock replacement.
Can I replace Mazda 3 struts myself?
Replacing the rear shocks is a DIY-friendly job for a home mechanic with the right tools. Replacing the front struts is more complex. If you do not use a complete strut assembly, you will need a spring compressor, which can be dangerous. Due to the complexity and the required wheel alignment afterward, many owners have a professional shop replace the front struts.
Helpful Videos
Technical Specifications
OEM Part Numbers: BHP7-34-900 BHP7-34-700 BJS7-34-700D BDTS-28-700B
The 2015-2019 Mazda 3 features a MacPherson strut front suspension and a multi-link rear suspension with separate coil springs and shock absorbers. Part numbers can vary based on whether the vehicle was built in Japan (VIN starts with 'JM1') or Mexico (VIN starts with '3MZ').
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Mazda 3:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is It Time for New Struts?
- Key Failure Symptoms
- Known Issue: Front Coil Spring TSB
- Choosing the Right Aftermarket Strut
- Brand Tiers for Your Mazda 3
- Pro Tip: Consider a Complete Strut Assembly
- Cost to Replace Mazda 3 Struts & Shocks
- Frequently Asked Questions
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