---
title: "O2 Sensor Bung — $112K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/automotive/o2-sensor-bung"
last_updated: "2026-08-10T09:26:09.860Z"
locale: en
meta:
description: "Niche score 48/100 · $112K/yr market · 89K searches/yr · $13.46 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 48/100 · $112K/yr market · 89K searches/yr · $13.46 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "O2 Sensor Bung — $112K/yr Amazon US Niche (2026) - Flapen"
---
# **o2 sensor bung**
**Skip it**
Strong incumbent ratings (4.7★) — this niche doesn't clear our bar today.
Market size 27Growth 24Conversion 84Competition 44Returns 81Price range 52Avg price 62Brand share 53Review moat 91Quality gap 19
**Review moat**
**Great****172.83**
avg incumbent reviews — the moat a new listing must climb
**Conversion**
**Great****9.3%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Great****1.7%**
return rate — above 5% kills the launch gate
**Avg price**
**Good****$13.46**
avg listing price — sweet spot $15–$100
**Brand share**
**Good****73%**
top-5 brand share — brands hold most of the demand
**Price range**
**Good****$6.52–$24.10**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Competition**
**Okay****58%**
top-5 click share — leaders hold, buyers still browse
**Market size**
**Okay****$112K**
$112K/yr · 89K searches
**Growth**
**Bad****-1.0%**
90-day search growth — must beat 0% to launch
**Quality gap**
**Bad****4.7★**
avg incumbent rating — lower means beatable quality
**Signals**[** Low Review Barrier**](https://flapen.com/research/niches?market=us&signal=low_review_barrier "Top brand's reviews < 500")
According to Flapen's Amazon United States niche tracking, o2 sensor bung is a $112K/yr Amazon United States market (89K searches/yr). The top 5 brands hold 73% of demand. Verdict: Skip it — 48/100.
Data updated Jul 9, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **o2 sensor bung market data**
- **Units sold / yr**
- **8K–10K**
- avg 250–500/product
- **Revenue / yr**
- **$108K–$135K**
- units × avg price
- **Conversion rate**
- **9.3%**
- **Avg BSR**
- **#404**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **71%**
- **Out of stock**
- **2.4%**
- **Avg brand age**
- **40 months**
- **Avg seller age**
- **181 days**
## **Competition & brand share**
The top 5 products take 58% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**18 **▲rising
**Sellers**
**20**
**Top-5 brand share**
**73%**
Top 20: 100%
**Top-5 click share**
**58%**
Top 20: 98%
**Open market**
**22%**
- HOHNNYREET30% - LEDAUT16% - Wevdn11% - joytrace10% - AMAAM7% - JGR4%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -1.0% search growth over the last 90 days.
2K2KSpike '24Spike '26 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.4×
[**Open Trend **](https://flapen.com/research/us/automotive/o2-sensor-bung/trend)
## **Top o2 sensor bung search terms**
- **o2 sensor bung**48K/yr-0.1%8.5% conv. - **02 sensor bung**17K/yr-8.6%9.6% conv. - **o2 bung**8K/yr+40.7%11.0% conv. - **oxygen sensor bung**7K/yr-8.5%9.4% conv. - **02 bung**3K/yr+1.0%8.6% conv. - **weld in o2 sensor bung**3K/yr-6.8%12.1% conv. - **o2 bung weld in**3K/yr-40.5%11.9% conv. [**All search terms **](https://flapen.com/research/us/automotive/o2-sensor-bung/search-terms)
## **Top o2 sensor bung 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%5%$6K10%$11K15%$17K20%$22K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 24 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**4 Pcs O2 Sensor Bung 304 Stainless Steel M18x1.5 O2 Bung Weld in Oxygen Sensor Bung Stepped Style**HOHNNYREET**$12.90**4.9★111 rev](https://www.amazon.com/dp/B0F2SH8RBR) [2**Ledaut M18X1.5 Bung and Plug Notched Style (2 Bungs/ 2 Plugs) Notched Style Fitting Bungs M18X1.5**LEDAUT**$13.09**4.7★1,382 rev](https://www.amazon.com/dp/B01N0DZO12) [3**joytrace M18x1.5 Oxygen Sensor Weld Bungs & Plugs Kit (2 Bungs/2 Plugs) - Stainless Steel Welding Adapters**joytrace**$10.08**4.8★47 rev](https://www.amazon.com/dp/B0F2HFZW8T) [4**Wevdn M181.5 Stepped Mounting Bung and Plug 304 Stainless Steel Notched Style Mounting Bung & Plug O2 Oxygen Sensor Mounting Exhaust Weld in Bung Plug Car Accessories**Wevdn**$6.98**4.6★103 rev](https://www.amazon.com/dp/B0DHPFB17T) [5**O2 Oxygen Sensor Bung and Plug 304 Stainless Steel M18-1.5 Oxygen Sensor Bung Stepped Style with Plug Suppied by Hohnnyreet (2 Silver M18 X 1.5)**HOHNNYREET**$12.41**4.7★182 rev](https://www.amazon.com/dp/B0DG8ZK8J7)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Ucreative O2 Sensor Bung 304 Stainless Steel M18 x 1.5 Weld in Oxygen Sensor Bung (4PCS)**Ucreative**$8.84**13 rev9mo ago](https://www.amazon.com/dp/B0FS6B4RZJ) [**Ywdiml 4PCS M181.5 Car Stepped Mounting Bung and Plug 304 Stainless Steel Vehicle Oxygen Sensor Bung Automotive Sensor Notched Nut Weld Plugs Accessories Universal for SUV Sedan Truck**Ywdiml**$6.52**12 rev9mo ago](https://www.amazon.com/dp/B0FS6YMBKW) [**4PCS M18x1.5 Car Sensor Bung 304 Stainless Steel Automotive Sensor Bung with Stepped Design for Automotive Exhaust Pipes Welded Car Sensors Bungs Vehicle Accessories**YGDMD**$7.71**8 rev10mo ago](https://www.amazon.com/dp/B0FNHKBRDV) [**O2 Oxygen Sensor Bung and Plug with Copper Gasket 304 Stainless Steel (2Pack 1.5)**SARANICE**$10.39**20 rev11mo ago](https://www.amazon.com/dp/B0FBLXFLWD) [**O2 Sensor Bung Weld in with Plug 2 Set O2 Bung 304 Stainless Steel M18-1.5 Oxygen Sensor Bungs Plugs with Copper O-Ring for Automotive Bike Motocycle**HOHNNYREET**$14.09**54 rev11mo ago](https://www.amazon.com/dp/B0FDQX17N6)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Wevdn 2 PCS M181.5 Stepped Mounting Bung and Plug 304 Stainless Steel Notched Style Mounting Bung & Plug O2 Oxygen Sensor Mounting Exhaust Weld in Bung Plug Car Accessories**Wevdn**$9.55**4.6★**▲ 126%**](https://www.amazon.com/dp/B0DHPGT3YT) [**O2 Sensor Bung Weld in with Plug 2 Set O2 Bung 304 Stainless Steel M18-1.5 Oxygen Sensor Bungs Plugs with Copper O-Ring for Automotive Bike Motocycle**HOHNNYREET**$14.09**4.8★**▲ 121%**](https://www.amazon.com/dp/B0FDQX17N6) [**Oxygen Sensor Bung and Plug Kit 304 Stainless Steel Weld-On Bung with Carbon Steel Screw Plug M18 x 1.5 Thread for Exhaust Fabrication(2 Pack)**GIroiyai**$8.94**4.8★**▲ 120%**](https://www.amazon.com/dp/B0FWKCW184) [**joytrace M18x1.5 Oxygen Sensor Weld Bungs & Plugs Kit (2 Bungs/2 Plugs) - Stainless Steel Welding Adapters**joytrace**$10.08**4.8★**▲ 69%**](https://www.amazon.com/dp/B0F2HFZW8T) [**Ucreative O2 Sensor Bung 304 Stainless Steel M18 x 1.5 Weld in Oxygen Sensor Bung (4PCS)**Ucreative**$8.84**4.9★**▲ 56%**](https://www.amazon.com/dp/B0FS6B4RZJ)
**~~View all trending →~~**
## **What buyers say about o2 sensor bung**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**39%
*“The machining is good quality”*
**Size-Overall**11%
*“Good fit”*
**Value For Money**10%
*“Good deal”*
**Advertised Vs Actual Product**9%
*“Work as they should”*
**Assembly/Installation**6%
*“Easy to install”*
**Efficiency**6%
*“Work good”*
**Material Quality**4%
*“Nice quality stainless steel fittings at an economical price”*
**Ease Of Use**3%
*“It's easy to use”*
**Socket/Port/Plug**2%
*“Plug”*
**Leak-Proof**2%
*“this was quick and works, doesn't seem to leak, at some point will weld in one”*
### **What buyers complain about **
**Advertised Vs Actual Product**25%
*“Does not come as package shown”*
**Quality-Overall**19%
*“Trash”*
**Size-Overall**13%
*“it is tight”*
**Sensor**13%
*“I needed a plug to install into my new Catalytic Converter for my vehicle that does not have a rear Oxygen Sensor so I blocked off the bung hole”*
**Rusts/Corrodes**6%
*“My oxygen sensor bung rusted out of the exhaust pipe”*
**Heating**4%
*“If you get them too hot”*
**Value For Money**4%
*“which was selling for $8 at the time of this review - SEE MY NOTE at the end of this review”*
### **Top return reasons **
**Size-Overall**51%
**Compatibility-Overall**10%
**Value For Money**7%
**Defective Material/Parts**4%
**Material Quality**4%
**Advertised Vs Actual Product**4%
**Sensor**3%
**Width**3%
**Ease Of Use**2%
**Quality-Overall**2%
## **Common questions**
- **Is o2 sensor bung profitable to sell on Amazon United States?**
- The niche generates $112K/yr across 24 tracked products. 1 of 5 products launched in the last 360 days are still selling. 90-day search growth is -1.0%. Flapen's verdict: Skip it (48/100).
- **How competitive is the o2 sensor bung niche?**
- 18 brands and 20 sellers compete. The top 5 products take 58% of clicks and top 5 brands hold 73% of demand.
- **What do buyers complain about in o2 sensor bung?**
- Top complaints mined from reviews: Advertised Vs Actual Product, Quality-Overall, Size-Overall. The return rate is 1.7%.
- **When does demand for o2 sensor bung peak?**
- Demand is steady year-round — the busiest month runs 1.4× the quietest.
- **What does it cost to enter the o2 sensor bung niche?**
- Listings span $6.52–$24.10; the average listing price is $13.46 (sweet spot $15–$100). The average incumbent carries 173 reviews — the moat a new listing must climb.
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