O2 Sensor Spacer with Mini Catalytic Converter - 3 Pack-1
O2 Sensor Spacer with Mini Catalytic Converter - 3 Pack-2
O2 Sensor Spacer with Mini Catalytic Converter - 3 Pack-3
O2 Sensor Spacer with Mini Catalytic Converter - 3 Pack-4
O2 Sensor Spacer with Mini Catalytic Converter - 3 Pack-5
O2 Sensor Spacer with Mini Catalytic Converter - 3 Pack-6
O2 Sensor Spacer with Mini Catalytic Converter - 3 Pack-7
    O2 Sensor Spacer with Mini Catalytic Converter - 3 Pack-1
    O2 Sensor Spacer with Mini Catalytic Converter - 3 Pack-2
    O2 Sensor Spacer with Mini Catalytic Converter - 3 Pack-3
    O2 Sensor Spacer with Mini Catalytic Converter - 3 Pack-4
    O2 Sensor Spacer with Mini Catalytic Converter - 3 Pack-5
    O2 Sensor Spacer with Mini Catalytic Converter - 3 Pack-6
    O2 Sensor Spacer with Mini Catalytic Converter - 3 Pack-7
O2 Sensor Spacer with Mini Catalytic Converter - 3 Pack-1
O2 Sensor Spacer with Mini Catalytic Converter - 3 Pack-2
O2 Sensor Spacer with Mini Catalytic Converter - 3 Pack-3
O2 Sensor Spacer with Mini Catalytic Converter - 3 Pack-4
O2 Sensor Spacer with Mini Catalytic Converter - 3 Pack-5
O2 Sensor Spacer with Mini Catalytic Converter - 3 Pack-6
O2 Sensor Spacer with Mini Catalytic Converter - 3 Pack-7
FlowCat

O2 Sensor Spacer with Mini Catalytic Converter - 3 Pack

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$32.98 USD
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  • The compact adapter threads between the exhaust-system sensor port and the oxygen sensor, adding controlled spacing together with an integrated mini catalyst core.
  • Installation normally requires no cutting, welding or exhaust-system disassembly. Always confirm the vehicle’s thread size, available clearance and sensor location before installation. Allow the exhaust to cool completely; professional installation is recommended.
  • P0420 relates to catalyst-efficiency readings on Bank 1, while P0430 relates to Bank 2. These codes indicate that efficiency has fallen below the vehicle’s expected threshold—but they do not automatically prove that the catalytic converter is physically damaged.
  • Exhaust leaks, aging oxygen sensors, wiring faults, active misfires, contamination and converter wear may create similar readings. Diagnose the complete system before replacing parts or selecting a solution.
  • A compatible sensor-port adapter may be used only when the exhaust hardware is mechanically intact. It cannot rebuild a melted, cracked or collapsed catalytic substrate, and it cannot repair a failed oxygen sensor.
  • Sensor deterioration, damaged wiring, exhaust leaks and active engine faults should be identified and corrected first. Physical converter damage requires mechanical inspection and appropriate repair.
  • Catalytic converters and oxygen sensors provide their most stable readings after reaching full operating temperature. Repeated short trips, stop-and-go traffic and extended idling can interrupt that process.
  • High-mileage exhaust systems may also carry years of deposits, heat cycles and component wear. Driving conditions alone cannot identify a failed part—scan the vehicle, inspect the system and confirm product compatibility before installation.

FlowCat®

Awards & Certifications

Indicates that the electromagnetic radiation from the FlowCat® unit is below the limits specified by the Federal Communications Commission.

Indicates that the electromagnetic radiation from the FlowCat® unit is below the limits specified by the Federal Communications Commission.

Indicates that Pedal Commander® meets strict emission standards set by the California Air Resources Board.

Indicates that Pedal Commander® meets strict emission standards set by the California Air Resources Board.

Pedal Commander® is a proud member of the Specialty Equipment Market Association and has been awarded numerous times.

Pedal Commander® is a proud member of the Specialty Equipment Market Association and has been awarded numerous times.

FlowCat®

Influencers & Athletes

Odi Bakchis

Professional Drifter

It's not laggy. It feels like a
racecar; you get a response!

Odi Bakchis

Corey Funk

Influencer

In sport mode, there's a huge
difference!

Corey Funk

Tony Fergusson

UFC Fighter

This is awesome. Whoever made
this is a genius.

Tony Fergusson

Cadence Cowan

Off-Road Racer

Better throttle response with
holeshots.

Cadence Cowan

Matt Field

Formula Drift Driver

I definitely notice the difference!

Matt Field

FlowCat®

Customer Reviews

1262
Solid, Well-Machined Part
Avery Thompson

02/18/2024

Solid, Well-Machined Part

The stainless body feels substantial, and the threads looked clean right out of the package. After confirming compatibility, it installed securely and sat straight in the sensor port.

Straightforward Installation
Noah Richardson

07/29/2025

Straightforward Installation

My mechanic installed it between the exhaust port and the existing oxygen sensor. The hex body was easy to reach with a wrench, and the finished connection looked clean and secure.

Compact Fit for a Tight Space
Madison Clark

11/07/2023

Compact Fit for a Tight Space

Clearance around my exhaust system was limited, but this adapter fit without interfering with the nearby heat shield or sensor wiring. The compact design made a noticeable difference during installation.

Worked With My Existing Sensor
Cameron Hughes

04/12/2026

Worked With My Existing Sensor

After checking the fitment, my original oxygen sensor threaded into the adapter smoothly. The cable reached naturally, and I didn’t have to modify or reroute the wiring.

No Cutting or Welding Required
Ella Peterson

09/15/2024

No Cutting or Welding Required

I liked that this was a threaded installation. There was no need to cut the exhaust pipe, weld on another fitting or remove a large section of the exhaust system.

Wrench-Friendly Design
Jackson Morris

01/23/2025

Wrench-Friendly Design

The large hex section made it much easier to control the installation with a standard wrench. It tightened evenly and felt much more secure than some smaller adapters I’ve used.

Good Fit on My Older Sedan
Zoey Ramirez

06/05/2023

Good Fit on My Older Sedan

I installed this while servicing the exhaust system on my high-mileage sedan. The threads matched correctly, the sensor cable remained in its original position and the completed setup looked professional.

Clean Installation on My SUV
Connor Bell

08/09/2026

Clean Installation on My SUV

After confirming the thread size and available clearance, this adapter fit my SUV without any trouble. It feels solid, and the installed assembly doesn’t look bulky or out of place.

Worked Well During My Pickup Repair
Audrey Simmons

03/17/2025

Worked Well During My Pickup Repair

I used this during exhaust work on an older pickup. The part was easy to handle underneath the truck, and the hex body gave me enough grip to tighten the connection properly.

Manageable Weekend Project
Luke Bryant

12/21/2024

Manageable Weekend Project

With the vehicle safely raised and the exhaust completely cool, the installation was manageable using an oxygen-sensor socket and wrench. The part lined up correctly and threaded in smoothly.