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O2 Sensor Extension Adapter with Mini Catalytic Converter

Regular price £99.95 Sale price£29.95 Save 70%
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NOTICE: This product is one of our bestsellers and is already sold out in our physical store. If the “ADD TO BAG” button still works, it means the product is still in stock online in limited quantities.

Eliminate the Check Engine Light with the Vehicle Oxygen O2 Sensor Adapter

Designed for vehicles with modified or custom exhaust systems, this O₂ Sensor Adapter helps ensure more consistent post-sensor readings. Its integrated mini catalytic converter helps balance exhaust flow to maintain accurate sensor feedback in specialized setups such as off-road or racing applications.

Reliable Performance with Built-In Mini Catalytic Converter

Unlike standard extensions, this adapter includes an integrated mini catalytic element that supports smoother exhaust flow and more consistent O₂ sensor operation. It helps reduce irregular readings that can occur in modified exhaust configurations.

Durable Stainless Steel Construction

Crafted from premium SS304 stainless steel with a corrosion-resistant filter mesh, this adapter is built for longevity and resilience. Its rustproof and wear-resistant design ensures consistent performance, even under demanding driving conditions, giving you lasting peace of mind on every journey.

Product Specifications

  • Material: High-quality SS304 stainless steel with mesh filter
  • Thread Size: M18 × 1.5
  • Weight: 0.088 lbs
  • Feature: Integrated mini catalytic converter
  • Usage: Off-road applications only

What’s Included

  • 1 × Vehicle Oxygen O2 Sensor Adapter

Frequently Asked Questions

Q: What causes the check engine light after exhaust modifications?
A: Removing or altering the catalytic converter can cause irregular readings in the post-O2 sensor, triggering codes like P0420 and P0430. This adapter helps regulate those readings to prevent such errors.

Q: Is this adapter suitable for all vehicles?
A: It fits most vehicles with M18×1.5 O2 sensor ports, but compatibility may vary. Always confirm thread size before installation.

Q: Does this product require professional installation?
A: No, installation is simple and tool-free—just screw it into the existing O2 sensor port.

Q: Can I use this adapter on public roads?
A: No, it is intended for off-road or racing use only and not compliant with on-road emissions standards.

Q: Will it permanently disable the check engine light?
A: It is designed to support stable sensor readings in modified exhaust setups, but it will not override other diagnostic functions of your vehicle’s ECU.

4.7 (19.342)
Jack Turner

Confirmation came through straight away, then another email when it was sent. Tracking worked and the parcel arrived when they said it would. Nice and straightforward

Benjamin Foster

Nothing missing and no surprises when I opened the parcel. What turned up matched what I’d seen on the website

Hannah Lewis

Had a look around before buying and this was a fair bit cheaper. Arrived as expected too, so happy with that.

Sophie Bennett

I emailed before ordering because I couldn’t work out which option I needed. Got a proper reply explaining the difference, rather than just a link back to the page I’d already read. Might seem a small thing but it helped me decide. Placed the order that evening and I’m happy with what arrived.

Harry Collins

My first order was only a small one a few months back. That went well, so I checked here when I needed something else. Different sort of purchase this time but everything was just as straightforward. Saved me another evening of looking around!

Daniel Thompson

Ordered Sunday evening and it was here Tuesday morning. Wasn’t expecting that, especially ordering over the weekend

Charlotte Brooks

All arrived, all good 😊

Amelia Scott

Entirely my mistake, I picked the wrong option and only noticed when the confirmation came through. Sent an email and they managed to change it before dispatch. Very relieved I didn’t have to deal with returning it afterwards!

George Wilson

Bought it in the sale. Happy with what I paid and it’s what I was after, which is the main thing.

Grace Mitchell

Hadn’t heard of Havenholt before and wasn’t sure about ordering from somewhere new. Only bought one thing to start with. There was a short wait for dispatch, but they kept me updated and everything arrived as described. Happy with the purchase and I’d be comfortable ordering again.

Emily Carter

There was a mix-up with my order so I had to get in touch. Sent a photo over and they explained what would happen next. Didn’t have to keep repeating myself to different people, which I really appreciated. All sorted now

Samuel Reed

They didn’t have the one I wanted when I went into the shop, but suggested checking online. Managed to order it on the website later that day. Would have preferred to take it home there and then, but this worked out fine.

Oxygen O2 Sensor Extension with Mini Converter - Stainless Steel Remove Check Engine Light for Modified Exhaust Systems