Lambda Boss
Our high-quality stainless steel lambda bosses (O2 sensor bungs) are designed for fitting oxygen sensors into exhaust systems, making them ideal for performance builds, custom exhaust fabrication, turbo conversions, and engine management upgrades.
Lambda bosses are a critical component for monitoring air-fuel ratios, allowing your ECU or wideband gauge to accurately read exhaust gas data. Whether you’re replacing a damaged boss or adding an additional sensor location, these are a must-have for any properly set up exhaust system.
Manufactured from premium stainless steel, our lambda bosses offer excellent heat resistance, corrosion protection, and long-term durability — suitable for both road and motorsport use.
Our lambda boss sensors measures oxygen levels in the exhaust gases, helping the engine management system adjust fueling for optimal performance, emissions, and fuel economy.
Features
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Precision Threaded: Designed to accept standard lambda / oxygen sensors
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Premium Stainless Steel: Rust-resistant and built to withstand extreme exhaust temperatures
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Universal Application: Suitable for most petrol vehicles using lambda sensors
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Ideal for Custom Builds: Perfect for fabricators, performance workshops, and DIY exhaust projects
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Motorsport & Road Use: Suitable for performance and daily-driven vehicles
Specifications
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Material: Stainless Steel
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Thread Type:M12 x 1.5mm
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Height / Length: 13mm
All dimensions are approximate
Images are for illustration purposes only
Fitment & Installation
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Designed to be welded into an exhaust pipe
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Professional fitting is recommended
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Ensure correct sensor positioning and angle for accurate readings
We cannot advise exact placement for your specific vehicle, as this depends on your exhaust layout and engine setup.
Additional Products Available
We sell a range of lambda bosses in different sizes and thread types — please see our eBay store for other options.
We also stock lambda boss pipe connectors, where the lambda boss is already integrated into a short section of exhaust pipe. These are ideal if you want to add a sensor location without the hassle of welding a boss into your existing pipe, making installation quicker and cleaner.
Buy With Confidence
We are a leading manufacturer of stainless-steel exhaust components, supplying both trade and retail customers. All products are made to high standards using quality materials.
We aim to dispatch our items the very same day if orders are placed before 12:15pm. Purchases made after 12:15pm will either be dispatch the same day if possible or the next working day.
During busy periods it may take 2 to 3 working days to dispatch on custom made items.
Shipping costs stated are for Mainland UK only.
Excludes Scottish Highlands, Islands (including Isle of Wight (PO30 - PO41), and Northern Ireland.
The following postcodes are considered as Highlands, Islands and Remote areas, and therefore are subject to higher postage charges: AB postcodes, DD8-11, GY1-99, HS1-99, IV1-23, IV25-27, IV30-32, IV36, IV40-56, JE1-99, KA27-28, KW1-3, KW5-17, PA20-49, PA60-78, PH19-26, PH30-44, PH49-50, & ZE1-99.
Please enquire about shipping costs to other locations and overseas.
We post Internationally too, drop us a message with your country and delivering post code / zip-code for a quote.
All UK based parcels that are sent via royal mail should be delivered within 2 to 3 days, however royal mail have advised to allow between 5 to 7 working days.
All UK based parcels that are sent via courier should be delivered within 2 working days.
If your parcel has not been delivered within the above time period then do notify us, so that we can contact the carrier to resolve the issue.
Please note:
Our new automated system is active.
Please provide the correct delivery address as we will not be responsible if the address is incorrect.
We offer a 30 day returns policy to our customers on ebay on the basis that the product has not been used or damaged.
If there is a problem with your purchase, please contact us and we will do our best to resolve the issue.
We will issue credit to the original PayPal account used for the purchase price, applicable taxes, & shipping cost for items shipped in error. Credit will be issued automatically upon receipt & inspection of the item(s). If only a portion of your original order is returned, credit for original shipping costs will be on a pro-rata basis.
If items are returned for reasons other than defect or error, then the customer will be responsible for all postage charges. MIJ will not pay for return postage. These returns include reasons such as "changed my mind" and "ordered incorrect product".
Returns for custom made items, including off-the-shelf items that have been adapted to customer's requirements, will not be accepted unless there has been an error on the part of MIJ.
Here at MIJ we accept the following payment methods:
Paypal payment is preferred, this is to ensure that your payment is secure
In addition to Paypal, we accept Debit / Credit Cards
For Trade Customers we can accept payment via BACS transfer please contact us.
Our contact details can be found under the business seller information section that usually is found at the bottom of the page.
Payment must be made in full before goods are dispatched.
If payment is not received within 4 days then a Unpaid Item Dispute will be opened with ebay, which may result in a Non-Payment strike against your account. If you are having trouble paying please contact us, we'll be happy to help.
Over the years MIJ has become more renowned for its custom-built exhaust systems, We have expanded into bolt-on parts and accessories, that are of the highest standard. We are continuously adding to our range, and are always looking into new and innovative products.
We are always eager to work with traders and commercial businesses, and pride ourselves on the service we provide. Please contact us for trade/commercial prices.
As a 21st century business we understand the needs of our customers. We are aware that some of our customers lead a highly pressurised work life and to relieve this pressure we have a full in-house working facility so you can remain in touch with your daily work life. We offer access to computer facilities and even a private room where you can conduct your important business while you wait for your vehicle.
Our purpose-built premises cater for all our customers automotive needs. We offer a wide range of tuning parts and high-performance exhaust systems for even the most powerful sports cars... just like our 1000bhp+ Nissan Skyline GTR.
All work was carried out on-site by our highly skilled technicians.
When it comes to your vehicle's needs, you're in safe hands with MIJ.
