loverapple FN01-21-550 Automatic Transmission Speed Sensor: Compatible with multiple Mazda models
Available Options
Picture this: you're cruising down the highway in your Mazda, and suddenly the speedometer starts acting like a confused compass. That's often the Automatic Transmission Speed Sensor calling it quits. This little gizmo is the unsung hero in models like the Mazda 2, 3, 5, 6, CX-7, and Protege, keeping tabs on the transmission output shaft's speed. It feeds critical data to the car's brain for buttery-smooth gear shifts and peak efficiency. Get it wrong, and you're looking at jerky changes, a thirstier fuel tank, or even transmission meltdown—so yeah, it's kind of a big deal for keeping your ride silky and dependable.
In the trenches, this sensor is your first stop when the speedometer goes haywire, the check engine light flashes transmission trouble, or shifts feel like a jackhammer. Swapping it out? A cinch with basic tools—perfect for weekend warriors or a speedy garage job. Stick with a quality part, and you're not just fixing a glitch; you're boosting transmission longevity and safety, ensuring your Mazda handles everything from city crawls to open-road sprints without a hiccup.
- Ensures accurate speed readings
- Easy installation process
- Durable construction for longevity
- Improves transmission performance
- Compatible with multiple Mazda models
General specs
- Brand: loverapple
- Model: FN01-21-550
- Seller: Joom
- Compatibility: Mazda 2, Mazda 3, Mazda 5, Mazda 6, Mazda CX-7, Mazda Protege
- Type: Automatic Transmission Speed Sensor
- Part Number: FN01-21-550
- First listed by seller: 8/24/25
If you are interested in more details, you can find full information on the seller's page.
Shipping options
United States
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| Brand | loverapple | Tautoparts | Skyfree | FYUU-autoparts | happybuySE | loverapple |
| Model | FN01-21-550 | ZJ01-18-921 E001T50371 | 98AB9E731AG | PYFS-13-215 | R510-17-400, M5AC17400, R51017400 | GS1D4370XA |
| Color | ||||||
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| Price | $23.71 | $19.51 | $16.04 | $43.46 | $22.73 | $21.25 |
| Seller | Joom | Joom | Joom | Joom | Joom | Joom |
| Update | August 28, 2025 | August 28, 2025 | August 28, 2025 | August 28, 2025 | August 28, 2025 | August 28, 2025 |
| Compatibility | Mazda 2, Mazda 3, Mazda 5, Mazda 6, Mazda CX-7, Mazda Protege | Mazda 2, Mazda 3, Mazda 5, Mazda 6 | Ford C-Max, DM2 Fiesta MK V VI, Focus, Fusion, Mazda 2 | Mazda | MAZDA B2500, Ford Ranger | Mazda 6 Mk2 2007-12 |
Automatic Transmission Speed Sensor
Megha J.
Jaipur
September 4, 2025
as someone who tinkers with cars a bit, i picked this up hoping for a quick fix when my speedometer started acting up. installation was straightforward, no special tools needed, and it got things running again. but after a couple of weeks, i've noticed it's not as reliable as i'd like—sometimes the shifts still feel a bit rough, and i'm concerned it might fail soon. for the price, it's a decent temporary solution, but i'd recommend spending more on a higher-quality part if you want something that lasts. it's helped me avoid bigger problems for now, but it's not a permanent fix. overall, it works but could be better.
- Pros: it seems to fit right in my mazda and was easy to install with basic tools, which saved me a trip to the shop :) the speedometer is working again and shifts feel smoother now, so it does its job for now.
- Cons: the quality feels a bit cheap and i'm worried it might not last too long, plus it didn't completely fix all the transmission issues i was having, so it's just an okay fix not a great one.