O2 Sensor Spacer Adapter Mini Catalytic Converter M18x1.5

O2 Sensor Spacer Adapter with Built-In Mini Catalytic Converter

Keep your check engine light off and your vehicle running smoothly with this high-quality O2 Sensor Spacer Adapter. Featuring a built-in mini catalytic mesh, this bolt-on adapter fits all standard oxygen sensors with M18 x 1.5 threads — no cutting, welding, or modification required. Perfect for quick and easy installation.

Key Features

• Universal Fitment: Compatible with all standard M18 x 1.5 threaded O2 sensor ports — fits the vast majority of passenger cars and light trucks.
• Built-In Mini Catalyst: Stainless Steel 304 housing with an internal 400-cell Euro 3 catalytic mesh to help manage exhaust readings and prevent unnecessary warning lights.
• Premium SS304 Construction: Made from durable 304-grade stainless steel with a nickel-plated surface to resist cracking and excessive heat expansion for long-lasting performance.
• Straight Bolt-On Install: No modifications needed — installs in minutes with standard tools. Great for DIY mechanics and professionals alike.
• Available in 1-Pack or 2-Pack: Choose the quantity that best suits your vehicle setup or keep a spare on hand.

Specifications

• Material: Stainless Steel 304 (SS304), Nickel-Plated Surface
• Color: Silver
• Thread Size: M18 x 1.5
• Internal Cell Size: 400 (Euro 3 Standard)
• Weight: 74g
• Packaging: OPP Bag
• Country of Origin: Made in Mainland China

What's in the Box

• 1 or 2 x O2 Sensor Spacer Adapter (Mini Catalytic Converter) — based on selected quantity

Why Choose This Adapter?

If your vehicle's check engine light is triggered by O2 sensor readings downstream of the catalytic converter, this spacer adapter repositions the sensor signal with the help of an integrated catalytic mesh. The result is a cleaner, more stable sensor reading without expensive repairs. The SS304 stainless steel build ensures it can withstand the high heat and vibration of a real-world exhaust environment.

For more information on vehicle emission systems and oxygen sensors, visit the EPA Green Vehicles resource page.

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Frequently Asked Questions

Q: What thread size does this O2 sensor spacer adapter fit?

A: This O2 sensor spacer adapter is designed to fit all standard oxygen sensor ports with M18 x 1.5 threading, which covers the vast majority of passenger vehicles and light trucks on the road today.

Q: Will this adapter fix my check engine light?

A: This adapter is designed to reposition the downstream O2 sensor reading with a built-in 400-cell Euro 3 catalytic mesh, which can help stabilize sensor signals that trigger a check engine warning. Results may vary depending on your specific vehicle and diagnostic codes. Always verify the cause of your check engine light before installation.

Q: Is any modification or welding required to install this spacer?

A: No modification, cutting, or welding is needed. This is a straight bolt-on adapter — simply thread it into the existing M18 x 1.5 O2 sensor port and reinstall your sensor into the adapter. Installation typically takes just a few minutes with basic hand tools.

Q: What material is this O2 sensor spacer made from?

A: The spacer is constructed from high-grade Stainless Steel 304 (SS304) with a nickel-plated surface finish. This combination provides excellent resistance to heat expansion, corrosion, and cracking in high-temperature exhaust environments.