o2 sensor
Worth a lookShows a $3.5M/yr market, but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Market size
Incredible$3.5M$3.5M/yr · 3.9M searches
Avg price
Incredible$36.54avg listing price — sweet spot $15–$100
Price range
Great$9.70–$70.11cheapest to priciest tracked listing — scored on the share inside $15–$100
Competition
Great30%top-5 click share — an open shelf
Brand share
Great50%top-5 brand share — no brand owns this niche
Quality gap
Great4.2★avg incumbent rating — lower means beatable quality
Returns
Good2.1%return rate — above 5% kills the launch gate
Conversion
Okay2.5%search→purchase rate — share of searches ending in a sale
Review moat
Bad6,804.69avg incumbent reviews — the moat a new listing must climb
Growth
Bad-15.5%90-day search growth — must beat 0% to launch
According to Flapen's Amazon United States niche tracking, o2 sensor is a $3.5M/yr Amazon United States market (3.9M searches/yr). The top 5 brands hold 50% of demand. Verdict: Worth a look — 67/100.
Data updated Jul 11, 2026 · scored weekly · How we score niches
o2 sensor market data
- Units sold / yr
- 100K–125K
- avg 1,500–2,000/product
- Revenue / yr
- $3.7M–$4.6M
- units × avg price
- Conversion rate
- 2.5%
- Avg BSR
- #217
- Page quality
- 0%
- Prime
- 99%
- Sponsored
- 81%
- Out of stock
- 0.0%
- Avg brand age
- 44 months
- Avg seller age
- 156 days
Competition & brand share
Clicks spread well past the top 5 (30% combined) — an open shelf where new products get seen.Brands
35 falling
Sellers
107
Top-5 brand share
50%
Top 20: 88%
Top-5 click share
30%
Top 20: 56%
Open market
44%
- Gledewen13%
- Denso12%
- Bosch10%
- ACAUTO8%
- BLPextrm7%
- A-Premium6%
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -15.5% search growth over the last 90 days.No pronounced peak months · busiest ÷ quietest = 1.3×
Top o2 sensor search terms
- o2 sensor1.2M/yr
- oxygen sensor930K/yr
- 02 sensor439K/yr
- sensor de oxgeno209K/yr
- upstream o2 sensor132K/yr
- automotive replacement oxygen sensors84K/yr
- downstream o2 sensor92K/yr
- o2 sensor upstream117K/yr
- sensor de oxigeno bank 1 sensor 282K/yr
- sensores de oxgeno71K/yr
Top o2 sensor products on Amazon
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
All 24 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Oxygen Sensor Upstream Downstream O2 2Pcs | Compatible with Ford F150 F250 Ranger Expedition Explorer Escape Mazda Tribute Lincoln & More Replace# 15717 15716 15664 ZZC318861
Gledewen$29.224.3★2,644 rev
Oxygen O2 Sensor Upstream Downstream for Chry 300 for Dodge Challenger Charger Dakota Durango Grand Caravan Journey Neon Nitro for Jeep Commander Grand Cherokee Wrangler JK 56028994AA 56028994AB
BLPextrm$47.534.0★360 rev
ACAUTO 4Pcs 15717 Oxygen O2 Sensor Upstream Downstream Fit for Ford F-150 F250 F350 Ranger Escape Explorer Mustang Foucs Expedition Mazda Lincoln Jaguar Mercury Aston Martin 15716 15718
ACAUTO$39.384.3★234 rev
Denso Oxygen (O2) Sensor - 234-4622 (Fits Select Years of Lexus: ES300(h)/NX200t/NX300(h) Pontiac Vibe and Toyota: 4Runner/Avalon/Camry/Corolla/Matrix/Paseo/RAV4/Sienna/Solara/Tercel Vehicles)
Denso$52.074.4★1,241 rev
Walker Products 350-34039 Oxygen Sensor 4-Wire Direct Fit (Original Equipment Replacement O2 Sensor)
Walker Products$28.054.4★669 rev
Newest
by launch date
AdvanEX 234-4337 Oxygen O2 Sensor Upstream or Downstream Compatible with Buick Cadillac Chevrolet GMC Hammer Isuzu Oldsmobile Pontiac Saab Saturn Replaces 12578459 234-4087 2PCS
AdvanEX$28.1731 rev
HTMXJA 4Pcs Upstream and Downstream Oxygen O2 Sensor for Edge 3.7L 3.5L 11-14 Explorer 3.5L 11-15 F-150 3.7L 11-14 Escape 3.0L 10-12 Fusion 3.0L 10-12 CX-9 3.7L 11-15 .OE#234-5038 234-4490
HTMXJA$60.9251 rev
DriveFix Upstream and Downstream Oxygen Sensor Set for Lexus ES300 GX470 ES350 LX570 for Toyota Camry Avalon RAV4 Solara 4Runner Sequoia Tacoma Tundra Land Cruiser Matrix
DriveFix$50.3341 rev
HTMXJA 2Pcs Upstream and Downstream Oxygen O2 Sensor for 2012-2016 Accent Rio Vel0ster and Soul L4-2.4L OE#234-5055 234-4568
HTMXJA$34.03107 rev
maXpeedingrods 4PCS Oxygen O2 Sensor Set Replaces 234-4668 Upstream & Downstream Compatible with Chevrolet Avalanche Silverado Tahoe with GMC Sierra Yukon Acadia with Buick Enclave Escalade
maXpeedingrods$44.63228 rev
Trending
90-day click momentumDenso Oxygen (O2) Sensor - 234-4622 (Fits Select Years of Lexus: ES300(h)/NX200t/NX300(h) Pontiac Vibe and Toyota: 4Runner/Avalon/Camry/Corolla/Matrix/Paseo/RAV4/Sienna/Solara/Tercel Vehicles)
Denso$52.074.4★
AdvanEX 234-4337 Oxygen O2 Sensor Upstream or Downstream Compatible with Buick Cadillac Chevrolet GMC Hammer Isuzu Oldsmobile Pontiac Saab Saturn Replaces 12578459 234-4087 2PCS
AdvanEX$28.174.1★
maXpeedingrods 4PCS Oxygen O2 Sensor Set Replaces 234-4668 Upstream & Downstream Compatible with Chevrolet Avalanche Silverado Tahoe with GMC Sierra Yukon Acadia with Buick Enclave Escalade
maXpeedingrods$44.634.1★
TAUTOY 234-4668 234-4256 O2 Oxygen Sensor Up Downstream 4Pcs for 2008-2014 Cadillac Escalade ESV for Chevrolet/Chevy Avalanche Silverado 1500 2500 3500 Suburban for Sierra Yukon 213-4229 213-3866
TAUTOY$39.034.2★
HTMXJA 4Pcs Upstream and Downstream Oxygen O2 Sensor for Edge 3.7L 3.5L 11-14 Explorer 3.5L 11-15 F-150 3.7L 11-14 Escape 3.0L 10-12 Fusion 3.0L 10-12 CX-9 3.7L 11-15 .OE#234-5038 234-4490
HTMXJA$60.923.8★
What buyers say about o2 sensor
What buyers praise and complain about, mined from review topics.What buyers love
“EASY TO USE”
“Working good”
“The build quality is excellent”
“Exactly as advertised”
“Accurate and easy”
“Very affordable”
“Fit as advertised”
“Easy to check your oxygen levels”
“Perfect for heart rate”
“Very durable”
What buyers complain about
“NOT ACCURATE”
“Inaccurate Readings”
“Dose not work”
“broke in 2 months”
“Bad quality, stopped working the next day”
“I think the sensors I received are not compatible”
“Batteries dont last very long”
“Not Worth It”
“Very small”
“Not compatible, no help anywhere”
Top return reasons
Common questions
- Is o2 sensor profitable to sell on Amazon United States?
- The niche generates $3.5M/yr across 68 tracked products. 1 of 2 products launched in the last 360 days are still selling. 90-day search growth is -15.5%. Flapen's verdict: Worth a look (67/100).
- How competitive is the o2 sensor niche?
- 35 brands and 107 sellers compete. The top 5 products take 30% of clicks and top 5 brands hold 50% of demand.
- What do buyers complain about in o2 sensor?
- Top complaints mined from reviews: Accuracy-Overall, Measurement/Reading Accuracy, Functionality-Overall. The return rate is 2.1%.
- When does demand for o2 sensor peak?
- Demand is steady year-round — the busiest month runs 1.3× the quietest.
- What does it cost to enter the o2 sensor niche?
- Listings span $9.70–$70.11; the average listing price is $36.54 (sweet spot $15–$100). The average incumbent carries 6,805 reviews — the moat a new listing must climb.