Max Performance, Minimal Hassle.
Whether you’re running a tuned exhaust or a high-flow catalytic setup, these spacers help optimize O₂ sensor positioning for accurate diagnostic readings.
They install in minutes and are intended for off-road, racing, or diagnostic testing use only.
Useful for evaluating sensor performance and addressing P0420/P0430 diagnostic readings in non-emission-controlled applications.
Always check local laws and regulations before purchase or installation.
Choose Your CEL Fighter
Universal Oxygen (O2) Sensor Spacer / Defouler – M18 x 1.5 Thread
90° 02 oxygen Sensor Spacer/Defouler
How To Install
Installing an O₂ sensor spacer is quick and straightforward.
Simply remove the downstream O₂ sensor from your exhaust, thread the spacer into the exhaust bung, and reinstall the sensor into the spacer.
This setup is intended for off-road, racing, or diagnostic testing use only—not for emission-controlled or public-road vehicles.
It assists with sensor placement and diagnostic evaluation of readings such as P0420 and P0430 when testing vehicles with high-flow or modified exhaust systems.
Always check local laws and regulations before purchase or installation.
FAQs
Will this O2 sensor spacer clear my check engine light for P0420 or P0430?
Our O₂ sensor spacer is engineered for off-road, racing, and diagnostic testing use only.
It assists with sensor placement and diagnostic evaluation of readings such as P0420 and P0430 in modified or high-flow exhaust systems.
While results may vary depending on the setup, this component is intended for testing and tuning purposes in non-emission-controlled environments.
⚠️ Not for use on public roads or emission-controlled vehicles. Always check local laws and regulations before purchase or installation.
What vehicles is this O2 sensor spacer compatible with?
This O2 sensor spacer is universally compatible with all vehicles that use a standard M18x1.5 O2 sensor thread, which includes the vast majority of makes and models. It works with popular brands like Honda, Toyota, Nissan, Ford, BMW, Chevrolet, Hyundai, Subaru, Jeep, Lexus, Acura, Dodge, Mazda, Volkswagen, and many more. If your vehicle has a screw-in style oxygen sensor with that thread size, this spacer will fit.
Does this spacer work on both upstream and downstream O2 sensors?
Yes, this O₂ sensor spacer can be used for testing purposes on both upstream and downstream sensors.
It is most commonly applied to downstream (post-catalyst) sensors during diagnostic or off-road evaluations involving P0420/P0430 readings or custom exhaust configurations.
⚠️ For off-road, racing, or diagnostic testing use only. Not for use on public roads or emission-controlled vehicles. Always check local laws and regulations before installation.
WHAT IS YOUR RETURN POLICY OR GUARANTEE?
We offer a 30-day money-back guarantee on all orders. If you're not completely satisfied, you can return the product within 30 days for a full refund—no questions asked. Just contact our support team to start the return process.
Why Choose Us
Quality You Can Trust
We provide durable, easy-to-install O2 sensor spacers that keep your engine
running smoothly and your dashboard light-free.
I had a great experience with Ghaly’s Motor Parts! Shipping was fast my order arrived at my house in just two days. I installed the spacer right away, and it worked perfectly. My car passed the smog check with no issues. Highly recommend!
I drive a 2013 Honda Civic and got the dreaded P0420 code. I installed this O2 sensor spacer in under 10 minutes no tuning no special tools. The check engine light turned off after a couple drives. I passed California smog with no issues. THANK YOU!!
Passed Smog, No More CEL
I purchased this spacer because my car had a check engine light on for code P0420 I took it to the mechanic and was quoted 2k. Was hesitant at first if it would pass smog but it worked out perfectly, 10/10 would recommend.
Quality product works very well and resolved the issue with my car; the constant failures in the engine have disappeared.
Under the Hood
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Do O2 Sensor Spacers Really Help Clear the P0420 Code? [Expert Guide]
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