Bosch 008-542-78-18 4-Wire Heated Direct-Fit Oxygen Sensor

The Bosch 008-542-78-18 is a 4-wire heated direct-fit oxygen sensor (also sold under Bosch part number 15510) engineered to restore precise air/fuel ratio monitoring and protect your vehicle's emissions control system. Built to OE-identical standards, this sensor delivers the same level of accuracy and durability as the original factory unit.

The oxygen sensor continuously monitors exhaust gas oxygen content and sends a feedback signal to the engine control unit, allowing the ECU to optimize the air/fuel mixture for maximum fuel efficiency, reduced harmful emissions, and extended catalytic converter life. A worn or failed O2 sensor can trigger a check engine light, increase fuel consumption, and accelerate catalytic converter degradation.

Key Features:

• 4-wire heated design — faster warm-up for accurate readings sooner after cold starts
• Zirconia ceramic sensing element — proven OE-grade material for reliable, long-lasting performance
• Direct-fit OE-type connector and wiring harness included — no splicing or modification required
• Pre-coated threads with anti-seize compound — simplifies installation and prevents galling
• Threaded mounting with 18mm thread diameter and 22mm hex — standard fitment for easy service
• Overall sensor length approx. 16.9 inches with a 13.6-inch wiring harness
• Metal housing, steel finish — built to withstand high-temperature and vibration environments
• 100% functional quality tested before leaving the factory

Cross-Reference / OE Part Numbers: 0085427818, 0085423918, 0065422018, 0065422118, 5149169AA, 5149170AA, 5149171AA, 5149171AB, 5149180AA, 5149180AB, 5033500AA, 56028994AB, 56029049AA, 7B0906262A, 7B0906265A

Bosch invented the automotive oxygen sensor and has produced over one billion units worldwide, making them the most trusted name in O2 sensor technology. The Bosch 008-542-78-18 is sold individually.