---
title: "02 Sensor Spacer — $83K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/automotive/02-sensor-spacer"
last_updated: "2026-08-09T06:56:28.766Z"
locale: en
meta:
description: "Niche score 31/100 · $83K/yr market · 280K searches/yr · $10.47 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 31/100 · $83K/yr market · 280K searches/yr · $10.47 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "02 Sensor Spacer — $83K/yr Amazon US Niche (2026) - Flapen"
---
# **02 sensor spacer**
**Skip it**
Brand-locked demand (top 5 brands take 97% of clicks) — this niche doesn't clear our bar today.
Market size 21Growth 21Conversion 35Competition 18Returns 55Price range 45Avg price 37Brand share 7Review moat 82Quality gap 43
**Review moat**
**Great****355.25**
avg incumbent reviews — the moat a new listing must climb
**Returns**
**Good****2.8%**
return rate — above 5% kills the launch gate
**Price range**
**Okay****$5.98–$22.38**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Quality gap**
**Okay****4.5★**
avg incumbent rating — lower means beatable quality
**Avg price**
**Okay****$10.47**
avg listing price — sweet spot $15–$100
**Conversion**
**Okay****2.8%**
search→purchase rate — share of searches ending in a sale
**Market size**
**Bad****$83K**
$83K/yr · 280K searches
**Growth**
**Bad****-7.3%**
90-day search growth — must beat 0% to launch
**Competition**
**Bad****79%**
top-5 click share — a locked-up shelf
**Brand share**
**Bad****97%**
top-5 brand share — brand-locked demand
**Signals**[** Out of Stock**](https://flapen.com/research/niches?market=us&signal=out_of_stock "OOS rate > 10%")
According to Flapen's Amazon United States niche tracking, 02 sensor spacer is a $83K/yr Amazon United States market (280K searches/yr). The top 5 brands hold 97% of demand. Verdict: Skip it — 31/100.
Data updated Jul 11, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **02 sensor spacer market data**
- **Units sold / yr**
- **6K–8K**
- avg 750–1,000/product
- **Revenue / yr**
- **$63K–$84K**
- units × avg price
- **Conversion rate**
- **2.8%**
- **Avg BSR**
- **#320**
- **Page quality**
- **0%**
- **Prime**
- **92%**
- **Sponsored**
- **50%**
- **Out of stock**
- **6.0%**
- **Avg brand age**
- **48 months**
- **Avg seller age**
- **172 days**
## **Competition & brand share**
The top 5 products capture 79% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**7 **▲rising
**Sellers**
**35**
**Top-5 brand share**
**97%**
Top 20: 100%
**Top-5 click share**
**79%**
Top 20: 100%
**Open market**
**1%**
- Dorman84% - Figpade6% - OHYVGD3% - DC,CLISENCE3% - Royal Sun1% - Lisle1% - Open — no brand owns it (1 brand, 1%)
## **Demand**
Weekly Amazon search volume, last 49 weeks — -7.3% search growth over the last 90 days.
6K4KSpike '26Aug '25Sep '25Nov '25Jan '26Mar '26May '26
[**Open Trend **](https://flapen.com/research/us/automotive/02-sensor-spacer/trend)
## **Top 02 sensor spacer search terms**
- **02 sensor spacer**120K/yr-7.3%0.3% conv. - **spark plug non fouler o2 sensor spacer**34K/yr-17.3%2.0% conv. - **spark plug non fouler**31K/yr+3.0%4.7% conv. - **02 sensor spacer adapter**27K/yr-10.6%0.3% conv. - **spark plug defouler**10K/yr+9.7%6.0% conv. - **spark plug fouler**9K/yr-3.8%5.7% conv. - **spark plug spacer**9K/yr-5.4%3.2% conv. - **spark plug anti fouler**8K/yr+3.7%6.6% conv. - **spark plug adapter**7K/yr-1.6%0.9% conv. - **spark plug non fouler o2 sensor**5K/yr+30.3%1.0% conv. [**All search terms **](https://flapen.com/research/us/automotive/02-sensor-spacer/search-terms)
## **Top 02 sensor spacer 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.
0%10%$8K20%$17K30%$25K40%$33K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 12 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Dorman 42109 Extended Spark Plug Non-Fouler - Universal Fit 2 Pack**Dorman**$13.47**4.6★960 rev](https://www.amazon.com/dp/B0CKZCMVVK) [2**Dorman 42002 Spark Plug Non-Foulers - 18 mm Tapered Seat Compatible with Select Models 2 Pack**Dorman**$10.76**4.3★545 rev](https://www.amazon.com/dp/B0002JMS6I) [3**Dorman 42009 Spark Plug Non-Foulers - 18 mm Gasket Seat 2 Pack Universal Fit**Dorman**$11.50**4.4★1,049 rev](https://www.amazon.com/dp/B000CO91FY) [4**Dorman 42004 Spark Plug Non-Foulers - 14 mm Gasket Seat Long Reach Compatible with Select Models 2 Pack**Dorman**$9.95**4.5★105 rev](https://www.amazon.com/dp/B000BYGJQY) [5**Dorman 42006 Spark Plug Non-Foulers - 14 mm Tapered Seat Compatible with Select Models 2 Pack**Dorman**$7.15**4.3★156 rev](https://www.amazon.com/dp/B000BYEQZ0)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**OHYVGD 2 PCS Sensor Adapter**OHYVGD**$22.38**2 rev1mo ago](https://www.amazon.com/dp/B0H4TM4LPW) [**DC CLISENCE 2 Pcs O2 Sensor Bung M18x1.5 Weld Oxygen Spacer Stainless Steel Sensor Adapter (Silver 0.98x0.51x0.86 inch)**DC,CLISENCE**$8.02**3 rev8mo ago](https://www.amazon.com/dp/B0FZKBVZ7M) [**2PCS M18x1.5 Sensor Bung 304 Stainless Steel Sensor Bung & Plug Kit with 2 Copper Spacer & Inner Hex Head Step Thread Car Accessories for Motorcycle Car Truck Exhaust Systems**Figpade**$7.28**17 rev11mo ago](https://www.amazon.com/dp/B0FLH7K21L) [**Lemxily Offset O2 Sensor Socket 7/8-Inch (22mm) with 3/8-Inch Drive Universal Fit for Vehicle Oxygen Sensor Removal**Lemxily**$5.98**958 rev1y ago](https://www.amazon.com/dp/B0DM1YCTXV) [**Stainless Adapters Reduce 02 O2 Sensor Ports Bungs 18MM to 12MM Plug for Dyna Fat Bob Softail Sportster 883 1200 Touring Electra Glide Ultra Road King Street Glide rike Tri-Glide**Royal Sun**$9.17**20 rev2y ago](https://www.amazon.com/dp/B0CQHNPHR7)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**OHYVGD 2 PCS Sensor Adapter**OHYVGD**$22.38**4.5★**▲ 274%**](https://www.amazon.com/dp/B0H4TM4LPW) [**2PCS M18x1.5 Sensor Bung 304 Stainless Steel Sensor Bung & Plug Kit with 2 Copper Spacer & Inner Hex Head Step Thread Car Accessories for Motorcycle Car Truck Exhaust Systems**Figpade**$7.28**4.6★**▲ 196%**](https://www.amazon.com/dp/B0FLH7K21L) [**DC CLISENCE 2 Pcs O2 Sensor Bung M18x1.5 Weld Oxygen Spacer Stainless Steel Sensor Adapter (Silver 0.98x0.51x0.86 inch)**DC,CLISENCE**$8.02**5.0★**▲ 130%**](https://www.amazon.com/dp/B0FZKBVZ7M) [**Dorman 42009 Spark Plug Non-Foulers - 18 mm Gasket Seat 2 Pack Universal Fit**Dorman**$11.50**4.4★**▲ 57%**](https://www.amazon.com/dp/B000CO91FY) [**Stainless Adapters Reduce 02 O2 Sensor Ports Bungs 18MM to 12MM Plug for Dyna Fat Bob Softail Sportster 883 1200 Touring Electra Glide Ultra Road King Street Glide rike Tri-Glide**Royal Sun**$9.17**4.5★**▲ 45%**](https://www.amazon.com/dp/B0CQHNPHR7)
**~~View all trending →~~**
## **What buyers say about 02 sensor spacer**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Advertised Vs Actual Product**20%
*“As advertised”*
**Size-Overall**17%
*“Fits perfectly”*
**Efficiency**16%
*“Does the job”*
**Value For Money**10%
*“Excellent deal”*
**Quality-Overall**7%
*“Quality is durable steel”*
**Ease Of Use**5%
*“Easy to use”*
**Socket/Port/Plug**5%
*“Spark Plug non fouler”*
**Assembly/Installation**3%
*“Easy to install-”*
**Strength**3%
*“they are sturdy”*
**Rusts/Corrodes**2%
*“Was exactly what was needed to easily remove a rusted O2 sensor on a 2015 Chevy Trax”*
### **What buyers complain about **
**Sensor**27%
*“they end up falling out of the socket of the O2 sensor”*
**Size-Overall**13%
*“Does not fit”*
**Quality-Overall**10%
*“Poor quality control”*
**Compatibility-Overall**5%
*“Doesn't fit 7/8 22mm o2 sensor”*
**Grip**3%
*“Due to the split design, the socket tends to flex and lose grip”*
**Product Condition**3%
*“Item was used, not new”*
**Compression**3%
*“didn't use them for intended purpose - used them as extensions for compression testing on my vw bug -”*
**Functionality-Overall**3%
*“Doesn't work”*
**Assembly/Installation**3%
*“not good with this installed”*
**Motor Issues**2%
*“Older lawn tractor didnt run good”*
### **Top return reasons **
**Size-Overall**54%
**Compatibility-Overall**10%
**Sensor**7%
**Functionality-Overall**6%
**Advertised Vs Actual Product**5%
**Socket/Port/Plug**4%
**Value For Money**4%
**Defective Material/Parts**3%
**Assembly/Installation**2%
**Product Condition**1%
## **Common questions**
- **Is 02 sensor spacer profitable to sell on Amazon United States?**
- The niche generates $83K/yr across 12 tracked products. 1 of 3 products launched in the last 360 days are still selling. 90-day search growth is -7.3%. Flapen's verdict: Skip it (31/100).
- **How competitive is the 02 sensor spacer niche?**
- 7 brands and 35 sellers compete. The top 5 products take 79% of clicks and top 5 brands hold 97% of demand.
- **What do buyers complain about in 02 sensor spacer?**
- Top complaints mined from reviews: Sensor, Size-Overall, Quality-Overall. The return rate is 2.8%.
- **What does it cost to enter the 02 sensor spacer niche?**
- Listings span $5.98–$22.38; the average listing price is $10.47 (sweet spot $15–$100). The average incumbent carries 355 reviews — the moat a new listing must climb.
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