M12x1.25 O2 Oxygen Sensor Blanking Plug Cap with Gasket

Seal Your Exhaust Perfectly with This M12x1.25 O2 Sensor Blanking Plug

Keep your exhaust system clean, sealed, and free from leaks with this heavy-duty M12 x 1.25 Oxygen Sensor Blanking Plug. Crafted from premium stainless steel, this hex-threaded bung plug is designed to cap off unused or removed O2 sensor ports in your exhaust system — preventing exhaust leaks, eliminating annoying ticking noises, and protecting your vehicle's performance.

Whether you're doing an exhaust upgrade, swapping out a catalytic converter, or simply plugging an unused sensor bung, this replacement cap is an essential and affordable solution for any DIY mechanic or automotive enthusiast.

Made in Mainland China.

Key Features

• Material: High-quality stainless steel — corrosion-resistant and built to last under extreme heat
• Thread Size: M12 x 1.25 — standard thread pitch compatible with most exhaust systems
• Hex Head Design: Easy installation and removal with a standard wrench or socket
• Includes Gasket: Comes with a sealing gasket for an airtight, leak-free fit
• Package Contents: 1 x Blanking Plug Cap with Gasket
• Color: Stainless steel finish (as shown in product images)

Who Is This For?

This plug is ideal for:

• Capping off removed or secondary oxygen sensor ports
• Exhaust system modifications and upgrades
• Preventing exhaust gas leaks at unused bung holes
• DIY automotive repairs and garage builds

Installation Note

Please allow 2–3% dimensional tolerance due to manual measurement. Actual color may vary slightly from product images depending on your monitor settings. Always ensure the exhaust system is cool before installation.

For more automotive accessories, check out our DisplayPort to HDMI Cable 4K DP Adapter and 1 to 5 SATA Power Splitter Cable for other upgrade essentials.

For guidance on vehicle exhaust safety and emissions standards, visit the U.S. Environmental Protection Agency (EPA) – Vehicle Exhaust Emissions.

Learn more: Exhaust system

Frequently Asked Questions

Q: What thread size does this O2 sensor blanking plug use?

A: This oxygen sensor blanking plug uses a standard M12 x 1.25 thread pitch, which is compatible with the majority of aftermarket and OEM exhaust systems that use this common O2 sensor bung size.

Q: Does the blanking plug come with a gasket?

A: Yes! Each M12 x 1.25 blanking plug cap comes with a sealing gasket included to ensure an airtight, exhaust-leak-free seal when installed in your vehicle's exhaust system.

Q: What material is this exhaust blanking plug made from?

A: The plug is made from high-grade stainless steel, which offers excellent heat resistance, corrosion resistance, and long-term durability — even when exposed to the high temperatures of an automotive exhaust system.

Q: Can I use this plug if I remove my downstream O2 sensor?

A: Yes, this blanking plug is designed specifically to cap off oxygen sensor ports that are no longer in use, such as after a catalytic converter removal or exhaust system modification. Always verify local emissions regulations before modifying your exhaust system.