Oxygen Sensor Spacer with Built-In Mini Cat for Check Engine Light | M18x1.5 Universal Thread Stainless Steel Adapter | 2-Pack | Lonoma

Clear That Stubborn Dashboard Warning in Minutes

If you've upgraded to a high-flow exhaust or performance headers, you know the frustration of a persistent check engine light that won't go away. This oxygen sensor adapter with an integrated miniature catalytic converter works smarter than basic spacers by actively treating exhaust gases before they reach your downstream sensor. The result? Your ECU reads factory-like values without sacrificing the performance gains you worked hard to achieve. Built from heavy-duty stainless steel with M18x1.5 threading on both ends, it withstands extreme exhaust heat while delivering a stable, long-term solution. Installation takes just four straightforward steps—no cutting, no welding, no expensive tuning required.

Why You Need This

• Built-In Catalytic Element: The internal mini-cat actively filters exhaust gases, giving your ECU the readings it expects while you keep your upgraded system.
• Universal M18x1.5 Fit: Dual-ended threading ensures compatibility with most vehicles that use standard M18x1.5 oxygen sensor ports—just thread in and secure.
• Heat-Resistant Stainless Steel: Industrial-grade construction stands up to continuous high temperatures without warping, corroding, or failing over time.
• Magnetic Induction Technology: Precise sensor positioning via magnetic offset ensures the downstream O2 sensor receives accurate data, not false alarms.
• Plug-and-Play Installation: Four simple bolt-on steps with included instructions mean you'll be back on the road in under half an hour—no special tools or professional help needed.
• Compact, Low-Profile Design: Short body preserves ground clearance and fits tight engine bays without interfering with other components or reducing performance.

Engineered for Real-World Driving

Whether you're running a race header, a test pipe, or a high-flow catalytic converter, this adapter gives your vehicle's computer the confidence to turn off that warning lamp. The dual-threaded design mounts securely between your exhaust and sensor, while the compact profile keeps everything tucked away neatly. Because it uses a functional catalytic element instead of just physical spacing, you get consistent readings mile after mile. Each package includes a pair, so you're covered for both downstream sensors or have a backup on hand. And with our free US shipping and 30-day return policy, you can install with total peace of mind.