Stop the Check Engine Light — No Catalytic Converter Needed

Tired of that annoying Check Engine Light (CEL) triggered by a failing or removed catalytic converter? This M18x1.5 Stainless Steel Oxygen Sensor Spacer is the go-to solution for off-road builds, performance upgrades, and exhaust modifications. The built-in mini stainless steel filter diffuses exhaust gases before they reach your downstream O2 sensor, preventing false "catalyst below efficiency" codes from lighting up your dash.

Key Features

Eliminates CEL Codes: Internal stainless mesh filter stops false catalyst efficiency error codes (P0420/P0430).
Universal Fit: Compatible with any vehicle using a standard M18x1.5 threaded O2 sensor bung — fits most cars, trucks, and SUVs.
Premium Stainless Steel Construction: Corrosion-resistant, heat-tolerant, and built to last in harsh exhaust environments.
Easy Installation: Simply thread the spacer into your existing O2 sensor bung, then thread your sensor into the spacer. No special tools required.
Off-Road & Performance Ready: Ideal for exhaust upgrades, catback systems, and off-road performance builds.
Fine Workmanship: Precision-machined threads for a secure, leak-free fit.

Specifications

Material	Stainless Steel
Color	Silver
Thread Size	M18 x 1.5
Length	Approx. 46mm / 2.16 inches
Sensor Compatibility	Standard M18x1.5 O2 sensors
Country of Origin	Made in China

What's in the Box?

1 / 2 / 3 / 4 / 5 × Oxygen Sensor Spacer (select your quantity)

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Helpful Resource

Want to understand more about vehicle emissions systems and how oxygen sensors work? Visit the U.S. EPA Green Vehicles resource for authoritative information on vehicle emissions and sensor standards.

Note: Please allow ±1–5mm variance due to manual measurement. Colors may appear slightly different on screen depending on your monitor's calibration settings.

Frequently Asked Questions

Q: What does an M18x1.5 oxygen sensor spacer do?

A: An M18x1.5 oxygen sensor spacer (also called a CEL fix adapter) sits between your exhaust bung and the downstream O2 sensor. Its built-in stainless steel filter diffuses exhaust gases so the sensor reads a lower oxygen content, preventing the vehicle's ECU from triggering a "catalyst below efficiency" Check Engine Light (fault codes P0420 or P0430).

Q: Will this O2 sensor spacer fit my car?

A: This spacer is universally compatible with any vehicle that uses a standard M18x1.5 threaded oxygen sensor — which covers the vast majority of cars, trucks, and SUVs. Simply check that your downstream O2 sensor bung uses M18x1.5 threads before ordering.

Q: Is this oxygen sensor spacer legal for road use?

A: This product is designed and marketed for off-road and performance use. Using a CEL fix spacer on a street-registered vehicle may not comply with local emissions regulations. Always check your local laws before installing exhaust or emissions-related modifications on a road-registered vehicle.

Q: How many spacers do I need?

A: Most vehicles have one downstream oxygen sensor per catalytic converter location. If your vehicle has two catalytic converters (common on V6/V8 engines), you may need two spacers. This listing is available in packs of 1 to 5 so you can order exactly what you need.

Made with care

Great value

Elegant design

Quality materials

This product is crafted with quality materials to ensure durability and performance. Designed with your convenience in mind, it seamlessly fits into your everyday life.

We strive to process and ship all orders in a timely manner, working diligently to ensure that your items are on their way to you as soon as possible.

We are committed to ensuring a positive shopping experience for all our customers. If for any reason you wish to return an item, we invite you to reach out to our team for assistance, and we will evaluate every return request with care and consideration.