MateAuto 16-Piece Oxygen Sensor Socket Set — Slotted Sockets, Thread Chasers & Case

MateAuto's 16-piece oxygen sensor socket set is a complete mechanic-grade kit for removing and installing O2 sensors, fuel injectors, oil pressure units and thermal switches in tight engine bays.

This compact kit groups ten slotted sockets in 1/2" and 3/8" drive sizes, two thread chasers, two extensions, a universal joint and an adapter in a rigid carry case so you have the right tool when accessing hard-to-reach sensors on European cars such as Mercedes, VW, Audi and BMW. Sockets are laser-etched for quick size checks, and the slotted profiles let wiring stay routed while you turn fasteners. Forged from heat-treated CR-MO and CR-V steel with a corrosion-resistant finish, the set is built for frequent garage or shop use.

How does this kit help when sensors sit deep or behind heat shields?

The set includes 3" and 6" extensions plus a 1/2" universal joint to reach sensors set well into the exhaust or behind brackets. The slotted sockets let the sensor wires remain connected while you loosen or tighten, preventing wire damage and saving time.

• 3" and 6" extensions for extended reach
• 1/2" universal joint for angled access
• Slotted sockets accommodate sensor wiring during service
• 6- and 12-point openings deliver strong grip on hex surfaces

Which fastener and vehicle sizes are covered by this set?

The kit contains sockets sized 22mm, 27mm, 29mm, 7/8", 1", and 1-1/16" across both 1/2" and 3/8" drives, covering the common oxygen sensors and related fittings used on many European makes. Two thread chasers (M12x1.25 and M18x1.5) help restore damaged sensor threads for cleaner reinstallation.

• Sockets: 22mm, 27mm, 29mm, 7/8", 1", 1-1/16"
• Drives: 1/2" and 3/8" compatible sizes
• Thread chasers: M12x1.25 and M18x1.5
• Includes 3/8" to 1/2" adapter for flexible ratchet selection

What makes this set durable and reliable under heavy use?

MateAuto forges the sockets from heat-treated chrome-molybdenum and chrome-vanadium steels, then applies a corrosion-resistant coating so tools hold up under repeated torque and exposure. Laser-etched markings remain legible after long-term use, and the fitted plastic case protects the pieces in transport and storage.

• Forged CR-MO and CR-V steel for strength and wear resistance
• Corrosion-resistant finish extends tool life
• Laser-etched size markings prevent premature wear-off
• Sturdy plastic case organizes and protects components

How do I use the thread chasers and slotted sockets safely?

Thread chasers are intended to clean and realign sensor threads before reinstallation—run them carefully by hand first to avoid cross-threading. When using slotted sockets, route the sensor wiring through the slot so the harness remains connected and avoid using impact tools which can over-stress the sensor body.

• Run chasers by hand initially to confirm alignment
• Keep sensor wiring routed through socket slot during turn
• Use standard ratchets or breaker bars; avoid impact tools on sensors
• Confirm thread pitch (M12x1.25, M18x1.5) before chasing

Who this is for: This MateAuto set is designed for home mechanics, mobile technicians and shop professionals who work on European cars and need reliable access to recessed oxygen sensors and related fittings. If you service Mercedes, VW, Audi or BMW models, or frequently replace O2 sensors, injectors or thermal switches, this kit supplies the common socket sizes, extensions and thread tools to complete those jobs efficiently and protect sensor wiring. It is especially useful for anyone wanting an organized, durable kit that fits standard 1/2" and 3/8" ratchets and handles frequent garage demands.