Bosch 15819 Oxygen Sensor - Upstream

Bosch Actual OE Oxygen Sensor 15819

Bosch 15819 is a specific-fit, narrow-band heated oxygen sensor for upstream applications on select 1999-2000 Mercury Villager and Nissan Quest models without California Emission System. It provides direct air-fuel-ratio feedback to the ECU for stable closed-loop control and emissions monitoring.

Key Features

• Specific-fit oxygen sensor for direct application matching
• Narrow-band heated design for faster closed-loop response
• 3-wire configuration with blade terminals and oblong connector
• Threaded mounting with 18 mm thread size and 22 mm hex
• Metal housing with wiring harness included
• Upstream position fitment for 1999-2000 Mercury Villager and Nissan Quest

OE-Style Sensor Design

As part of Bosch’s Actual OE Oxygen Sensor line, part number 15819 reflects Bosch’s long OE development history in switching-type oxygen sensors. The sensor uses a ceramic sensing element and controlled heater operation to deliver accurate lambda feedback under changing exhaust temperatures and vibration. For drivers searching for a Bosch 15819 oxygen sensor for a 1999-2000 Nissan Quest upstream or a 1999-2000 Mercury Villager upstream, this replacement follows the OE-style configuration used by the vehicle’s engine management system.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Delayed or unstable closed-loop fuel control
• Incorrect air-fuel ratio feedback to the ECU
• Higher exhaust emissions from a worn upstream sensor
• Rough combustion control caused by slow sensor response

Installation Notes and Tips

Install Bosch 15819 in the upstream location only where specified by fitment. Verify the vehicle is a 1999-2000 Mercury Villager or 1999-2000 Nissan Quest without California Emission System before ordering. Confirm the 18 mm thread size, 22 mm hex, 3-wire layout, and oblong connector match the original sensor before installation. Use proper oxygen sensor service tools and inspect the harness routing to avoid heat damage.

Quality Assurance

Bosch backs this oxygen sensor with more than five decades of OE sensor development. The Actual OE line is built to OE-proven standards for accurate signal output, durable heater control, and consistent operation in demanding exhaust conditions.