Bosch 006-542-20-18 Downstream Oxygen Sensor 4-Wire Heated Direct Fit

The Bosch 006-542-20-18 is a heated downstream oxygen sensor (O2 sensor) engineered to OEM standards. Also sold under Bosch part number 15510, this sensor monitors exhaust oxygen concentration in real time, enabling the engine control unit to continuously optimize the air-fuel mixture for efficient combustion and reduced harmful emissions.

Key Features:

• Heated sensor design — reaches operating temperature quickly for accurate readings
• 4-wire construction with female rectangular connector and pin-type terminals
• Direct-fit replacement — threaded mounting with 18mm thread diameter and 22mm hex size
• OEM-equivalent quality — manufactured by Bosch, the company credited with inventing the first automotive oxygen sensor
• Steel and metal housing with included wiring harness (approximately 13.6 inches)
• Overall length: approximately 16.9 inches; sealing surface to connector end approximately 15.7 inches

Cross-Reference / OEM Part Numbers:

• Bosch: 15510, 006-542-20-18, 006-542-21-18
• OEM: A0065422018, 0065422018, 0065422118, 0085423918, 0085427818
• Additional: 7B0906262A, 56029049AA, 68021056AA, F00E262172, 1029551, 76029551

This sensor is a downstream (post-catalytic converter) replacement designed for specific applications. Proper oxygen sensor function is critical for maintaining fuel efficiency, minimizing emissions, and preventing catalytic converter damage.