Stainless steel construction handles exhaust heat without corroding.
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M18 × 1.5 Oxygen Sensor Extension Adapter with Mini Catalyst Core for Off-Road Check Engine Light Elimination | Lonoma
$29.95
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Keep Your Off-Road Dashboard Clear During Exhaust Modifications
When you upgrade your exhaust system or remove emissions equipment for off-road performance, the oxygen sensor readings can trigger dashboard warnings. This threaded adapter installs between your O2 sensor and the exhaust port, housing a miniature catalytic element that helps normalize sensor feedback. Built from corrosion-resistant stainless steel with an internal filter mesh, it's engineered for vehicles used exclusively in closed-course or private-property environments. The M18 × 1.5 threading fits most standard oxygen sensor ports, letting you complete installation with basic hand tools in minutes.
Why You Need This
- Eliminates Nuisance Codes: Addresses P0420, P0430, and similar diagnostic trouble codes that appear after cat removal on off-road builds.
- Integrated Catalyst Core: Unlike hollow spacers, the internal mini-converter element works with sensor chemistry to produce stable readings.
- Rust-Proof Construction: SS304 stainless steel body and woven mesh filter withstand heat, moisture, and exhaust gases without degrading.
- Tool-Free Threading: M18 × 1.5 pitch threads match factory oxygen sensor ports—no drilling, welding, or custom fabrication required.
- Lightweight Design: Weighs just 0.088 lb, adding negligible mass to your exhaust system while maintaining sensor position and clearance.
- Off-Road Legal Compliance: Designed exclusively for competition vehicles, farm equipment, and machines operated on private land—never for street use.
Built for Demanding Conditions
High-flow exhaust modifications expose downstream oxygen sensors to extreme temperatures and unburned fuel vapors, conditions that standard sensors interpret as catalyst failure. This adapter's stainless construction and internal catalyst element help stabilize those readings so your off-road vehicle runs without persistent dashboard alerts. Whether you're building a trail truck, a sand-rail, or a farm utility vehicle, the threaded design makes installation straightforward: unscrew the factory sensor, thread the adapter into the bung, reinstall the sensor into the adapter's female threads, and you're done. We ship free across the United States, and if it doesn't solve your check-engine concerns within 30 days, our return policy has you covered.
Free shipping on every order, with no minimum purchase.
Every order is carefully packed and shipped with full tracking, so you always know where your package is.
Order today and we'll ship it out the next business day.
Not quite right? You have 30 days to send it back, no questions asked.
We also back every product with a 2-year warranty against manufacturing defects, because we stand behind what we sell.
1
Contact us
Email us at info@lonoma.com with your order number and the reason for your return.
2
Ship it back
Pack the item securely and send it to our return address.
3
Get your refund
Once your return arrives, we'll process it and issue your refund within 5 business days.
M18 × 1.5 Oxygen Sensor Extension Adapter with Mini Catalyst Core for Off-Road Check Engine Light Elimination | Lonoma
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THE LONOMA EXPERIENCE
What Our Customers Say
Discover what makes LONOMA special.
The M18 × 1.5 threads match standard oxygen sensor ports perfectly.
Installing the mini catalyst core between sensor and exhaust port keeps dashboard warnings off during off-road builds.
Unlike hollow spacers, this adapter houses an actual catalytic element that helps stabilize oxygen sensor readings after cat removal.
The SS304 stainless body and woven mesh filter stand up to moisture and extreme temperatures without degrading over time.
Threading this adapter into the bung takes minutes with basic hand tools—no welding or drilling required—and at 0.088 lb it adds almost no weight to the exhaust system.
Designed exclusively for competition vehicles and private-property machines, this piece addresses P0420 and P0430 codes that appear when you modify exhaust systems for off-road performance.
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