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2020 Mazda Mazda3 Recalls, Problems & Maintenance

The 2020 Mazda Mazda3 carries 2 open NHTSA recalls — most recently covering automatic emergency braking and caliper. Owners report 4 recurring issue clusters, led by “Unintended automatic emergency braking.” Mazda's Skyactiv engines use unusually high compression ratios (13:1 to 16:1) and require strict adherence to oil intervals — extending oil life on a Skyactiv engine accelerates carbon buildup on intake valves. Mazda's published Schedule 1 (severe) covers most US driving conditions.

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2 Open Recalls

Source: NHTSA

FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING

Campaign #19V907000 · Dec 19, 2019

Issue: Mazda North American Operations (Mazda) is recalling certain 2019-2020 Mazda3 vehicles. The Smart Brake System (SBS) can falsely detect an obstacle while driving, activating the automatic emergency braking system and suddenly stopping the vehicle.

Risk: Stopping the vehicle unexpectedly increases the risk of a crash.

Fix: Mazda will notify owners, and dealers will update the SBS software. In addition, vehicles with certain production dates will receive an instrument cluster software update or replacement and a replacement owner's manual. These repairs will be performed free of charge. The recall began February 14, 2020. Owners may contact Mazda customer service at 1-800-222-5500, Option 4. Mazda's number for this recall is 4219L.

SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:DISC:CALIPER

Campaign #20V346000 · Dec 6, 2020

Issue: Mazda North American Operations (Mazda) is recalling certain 2020 CX-30 and Mazda3 vehicles. The front brake caliper mounting bolts may not have been tightened properly during assembly, possibly allowing the calipers to loosen.

Risk: Loose brake calipers can reduce braking performance or interfere with wheel rotation, affecting vehicle handling. Either of these scenarios can increase the risk of a crash.

Fix: Mazda will notify owners, and dealers will inspect the front brake caliper bolts, tightening them as necessary. If bolts are missing, the affected brake caliper will be replaced. Repairs will be performed free of charge. The recall began July 24, 2020. Owners may contact Mazda customer service at 1-800-222-5500, Option 4. Mazda's number for this recall is 4420F.

Recall data refreshed Sep 20, 2026.

Known issues & problems for this vehicle

What drivers and federal regulators have officially reported about the 2020 Mazda Mazda3.

Reported to NHTSA

Unintended automatic emergency braking

FORWARD COLLISION AVOIDANCE

14 NHTSA complaints · 2021-03 → 2023-09

“While driving on a residential street the automatic emergency braking system activated and brought the car to a very abrupt stop but there was nothing in the front of the car to activate the system. There were no cars in the on-coming lane and no…”
— Owner report, NHTSA ODI #11546515
“I was on the Queensboro Bridge headed from Queens, NY into Manhattan on the afternoon of August 29. Weather was partly cloudy and dry conditions. Traffic was bumper to bumper and moving anywhere from 0mph to maybe 5mph. I was in the middle of the…”
— Owner report, NHTSA ODI #11432358
“I WAS DRIVING MY VEHICLE STRAIGHT AHEAD ON A TWO-WAY CITY STREET WITH NO OTHER VEHICLES IN FRONT OR ON MY SIDES. I WAS TRAVELING AT A SPEED OF 40 MPH. THE TWO-WAY STREET IS SEPARATED BY A CONCRETE DIVIDER AND TROLLY TRACKS. A "BRAKE!" ALERT APPEARED…”
— Owner report, NHTSA ODI #11402806
“THIS CAR IS ONLY A FEW MONTHS OLD, WITH ONLY 1600 MILES. WHILE DRIVING AT APPROX 30 OR 40 MPH THE SMART BRAKE SYSTEM (SBS) FALSELY DETECTS RANDOMLY AN OBSTACLE WHILE DRIVING, ACTIVATING THE AUTOMATIC EMERGENCY WARNING LIGHT AND ALARM. THE MAZDA DEALER…”
— Owner report, NHTSA ODI #11415327

Read all complaints on NHTSA →

Forward sensing camera and radar sensor malfunction

FORWARD COLLISION AVOIDANCE

2 NHTSA complaints · 2021-06 → 2024-06

“The front radar sensor failed and doesn't work anymore rendering the FCW and ACC useless. There is a TSB out about water damage getting into the sensor. There are 2 warning lights on. They first appeared when I turned on my car one day.”
— Owner report, NHTSA ODI #11421125
“Google search shows Mazda has common problem with their front sensing camera, people are reporting the issue for different Mazda models across the board for the last few years including newer models as well. My car display shows few malfunction…”
— Owner report, NHTSA ODI #11594653

Read all complaints on NHTSA →

Lane departure and steering assist intervention

STEERING, LANE DEPARTURE

2 NHTSA complaints · 2020-09 → 2023-06

“Lane departure warning activated and attempted to correct during a gentle curve. The location had shifted lanes due to construction, so clear lines were visible but not the actual lane to follow which is a frequent occurrence in New York City. The…”
— Owner report, NHTSA ODI #11526570
“MY NEW 2020 MAZDA 3 PREMIUM WITH 1,177 MILES SUDDENLY TOOK COMPLETE CONTROL OF STEERING MY CAR. DRIVING 65-70 MPH ON A 3 LANE STRAIGHT HIGHWAY ON A CLEAR DAY, WITH LIGHT TRAFFIC, I MOVED ONE LANE TO MY LEFT, AND THE CAR TOOK OVER THE STEERING,…”
— Owner report, NHTSA ODI #11361790

Read all complaints on NHTSA →

Rear suspension spring and corrosion

SUSPENSION

2 NHTSA complaints · 2025-11 → 2025-11

“I pulled into the driveway (at about 5 mph) of my passenger's home, when a very loud, metallic pop occurred somewhere inside my vehicle. I could not discern the problem by visually inspecting the car. Upon returning to my home, I arranged for the…”
— Owner report, NHTSA ODI #11700190
“TSB 02-003/24 Car front suspension bolts corroded and making metal on metal sounds during turning and braking”
— Owner report, NHTSA ODI #11699700

Read all complaints on NHTSA →

Issues on other model years

Source: NHTSA Office of Defects Investigation (ODI). Complaint data refreshed Sep 20, 2026. Investigation data refreshed Sep 20, 2026.

We display NHTSA's record with attribution; we don't editorialize on what these complaints mean for any specific vehicle.

Raw data + downloads for this vehicle →

Essential maintenance

Critical for safety and preventing major damage

Engine Oil & Filter

Every 5,000 mi

Replace 0W-20 full-synthetic oil every 5,000 miles under Schedule 1. Schedule 2 (highway-only): 7,500 miles. Turbo engines: 5,000 miles regardless of schedule.

Estimated cost — typical U.S. ranges

Dealer

~$120–$160

Shop

~$85–$115

DIY

~$25–$55

Full synthetic costs more than conventional. 5-quart 0W-20 + filter is the typical bill.

Tire Rotation

Every 7,500 mi

Rotate tires every 7,500 miles; every 5,000 on AWD models, where the front-biased coupling wears tires unevenly.

Estimated cost — typical U.S. ranges

Dealer

~$85

Shop

~$60

DIY

Free

Often free at the shop where you bought the tires — worth asking before paying.

Brake Inspection

Every 7,500 mi

Inspect brake pads, rotors, and parking brake at every oil change. Front pads typically last 35,000-50,000 miles.

Estimated cost — typical U.S. ranges

Dealer

~$85

Shop

~$60

DIY

Free

Most shops do this free as a courtesy with any service. Don't pay separately if you can avoid it.

Brake Fluid

Every 30,000 mi

Replace DOT 3 brake fluid every 30,000 miles or 36 months.

Estimated cost — typical U.S. ranges

Dealer

~$180–$200

Shop

~$125–$140

DIY

~$10–$25

DOT 3 or 4 — match the cap. Vacuum bleeders make this a one-person DIY.

Important maintenance

Keeps your vehicle running smoothly and efficiently

Engine Air Filter

Every 30,000 mi

Replace engine air filter every 30,000 miles. Skyactiv-G direct injection is sensitive to airflow restriction — inspect at every oil change.

Estimated cost — typical U.S. ranges

Dealer

~$60–$95

Shop

~$45–$70

DIY

~$15–$40

5-minute job on most cars; the airbox lid usually has clips, no tools needed.

Automatic Transmission Fluid

Every 60,000 mi

Replace ATF every 60,000 miles severe / 100,000 normal. Use Mazda FZ ATF — substitutes cause harsh 1-2 shifts and torque converter shudder.

Estimated cost — typical U.S. ranges

Dealer

~$330–$500

Shop

~$235–$355

DIY

~$60–$180

Some sealed transmissions have no dipstick — fill is precise and best left to a shop. Many drivers can still DIY drain-and-fill.

Spark Plugs

Every 60,000 mi

Iridium spark plugs every 60,000 miles on Skyactiv-G 2.0L and 2.5L; 45,000 miles on the 2.5L Turbo.

Estimated cost — typical U.S. ranges

Dealer

~$285–$390

Shop

~$200–$275

DIY

~$25–$100

Iridium plugs cost more but last 100k+ miles. V6/V8 access varies wildly — some are tough.

FL-22 Long-Life Coolant

Every 60,000 mi

Mazda FL-22 (yellow): first change at 120,000 miles or 10 years, then every 60,000. Do not substitute — silicate-free formula prevents water pump damage on Skyactiv engines.

Estimated cost — typical U.S. ranges

Dealer

~$285–$330

Shop

~$200–$235

DIY

~$25–$60

Use the manufacturer-specified coolant — wrong color/chemistry can damage the cooling system.

Transfer Case / Rear Diff (AWD)

Every 60,000 mi

On AWD models, replace transfer case fluid and rear differential fluid every 60,000 miles.

Estimated cost — typical U.S. ranges

Dealer

~$105–$140

Shop

~$75–$100

DIY

~$15–$40

AWD/4WD vehicles only. Easy drain-and-fill on most platforms.

Recommended maintenance

Extends the life of your vehicle and improves comfort

Cabin Air Filter

Every 15,000 mi

Replace cabin air filter every 15,000 miles. On most models it sits behind the glove box.

Estimated cost — typical U.S. ranges

Dealer

~$60–$95

Shop

~$45–$70

DIY

~$15–$40

Usually behind the glovebox. Shops charge labor for a 10-minute job — easy DIY win.

Fatal crash history & reported problems

Occupant deaths in fatal crashes (FARS)

6 crashes 1990–2024

How the 6 occupant deaths break down

6

driver deaths

0

passenger deaths

6

occupant deaths

Crash years covered: 1990–2024 This model year first appears in 2021 crashes. Older models have had more years on the road to appear in these crashes, so a higher count here does not by itself mean a vehicle is less safe.

FARS counts every occupant death in a fatal crash, whatever the cause — it does not mean the vehicle was at fault or defective. Counts are not adjusted for how many of each vehicle are on the road. How to read this number

FARS 2024 data is an annual report file. NHTSA revises these records when the final file is published, so this count can change.

Why we show driver deaths too

Every vehicle has exactly one driver seat, so driver deaths line up fairly when you compare one model to another. Occupant deaths include passengers, so a three row SUV can show a higher number than a two seat car simply because it carries more people.

Both figures are plain counts, not rates. A rate would need to know how many of each vehicle are on the road, and that registration data is not public, so we do not publish rates or scores of any kind.

IIHS publishes driver death rates using this same driver only idea, paired with a registered vehicle years denominator we do not have. Their rates and these counts answer different questions, so do not read either number here as a safety rating.

Owner-reported problem signals

Separate from the federal fatality data above: complaints owners filed with NHTSA about this year and model. These are reports of problems, unverified, and are counted here only as signals.

0

complaints mentioning a crash

0

complaints mentioning a fire

Reviewed known issues for this vehicle·Open recalls for this vehicle

Typical U.S. ranges. Actual quotes vary by shop, parts choice, and vehicle condition.

How we estimate: Dealer = OEM parts × 1.4 + labor × $165/hr. Shop = parts + labor × $115/hr. DIY = parts only.

This maintenance schedule for the 2020 Mazda Mazda3 reflects Mazda's published service intervals. Your actual service needs may vary based on driving conditions, climate, and vehicle usage. Always consult your owner's manual for model-specific recommendations.

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