Bosch 11-78-1-247-406 Heated Oxygen Sensor 4-Wire OE Type

The Bosch 11-78-1-247-406 is a premium OE-identical heated oxygen sensor designed to monitor exhaust oxygen levels and optimize engine performance. This emissions control sensor detects oxygen levels in the engine's exhaust, generating an electrical current that is sent to the engine's computer and converted to an oxygen level reading, ensuring proper air-fuel mixture for improved fuel economy and reduced emissions.

Key Features:

• Four-wire heated design with 18mm thread diameter and 330mm (13") wire length
• True direct-fit OE connectors and harness for easy installation with pre-coated threads with anti-seize compound right out of the box
• Exclusive double laser-welded stainless steel body is totally submersible and sealed tight to protect against damage from exhaust emissions
• Fast-acting heater optimizes sensor operation allowing the oxygen sensor to reach its operating temperature quicker – within seconds – for optimum performance
• Zirconium material construction with thimble-type sensor design
• 100% tested for full functionality, resulting in a seared appearance of the protection tube

This is a pre-catalytic converter oxygen sensor also known as Bosch part number 13559. Recommended replacement interval is 100,000 miles. No cutting or splicing required for installation. Cross-references to OEM numbers 11781247406, 11781739846, and W0133-1617011.