Bosch 13721 Oxygen Sensor Heated Sensor - 4-Wire O2

The Bosch 13721 Oxygen Sensor delivers premium performance and extended service life for your vehicle's emission control system. This heated 4-wire oxygen sensor is designed to mount before the catalytic converter, providing critical feedback to your engine's computer for optimal fuel efficiency and emissions control.

Advanced Protection Technology:

• Patented catalytically activated fine particle filter prevents contamination and ensures precise voltage readings
• Dual-filter design doubles protection against exhaust gas contamination for extended sensor life
• Premium ceramic technology incorporating Zirconium or Titania and Yttrium provides superior resistance to mechanical and thermal shock
• Prevents premature catalytic converter failure by maintaining accurate air-fuel ratio monitoring

Quality Construction:

• 33.1-inch wire length provides flexible installation options
• OE-style silicone boots ensure snug fitting, proper function, and factory appearance
• Direct plug-in design requires no cutting or splicing for easy installation
• Rigorously tested to deliver perfect performance while maximizing fuel economy

This heated oxygen sensor is an OE-quality replacement part sold individually, designed to restore proper engine management system operation and help your vehicle pass emissions testing.