/live/media/BS/BS_15857_Fro.jpg)
Will it fit your vehicle?
Confirm before you buy. Free return shipping if it doesn't fit.
Bosch 15857 Oxygen Sensor - Downstream
| Brand | Bosch 15857 |
|---|---|
| Position | Downstream |
| Product line | Actual OE Oxygen Sensor |
| Fits | Mercury and Nissan · 4 vehicles |
Actual OE design. Bosch OE development brings proven sensor accuracy and stable combustion control.
Heated narrow-band sensor. Delivers quicker closed-loop response and consistent readings across changing conditions.
Threaded metal housing. Built with high-temperature-resistant materials for durability under harsh thermal loads.
Cross-references 226A07B013 for the same application. See all 1.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
Bosch Actual OE Oxygen Sensor 15857
Bosch 15857 is a narrow-band heated oxygen sensor built for precise air-fuel-ratio feedback to the ECU. It is a specific-fit downstream replacement for select 1999-2000 Mercury Villager and Nissan Quest applications without California Emission System equipment.
Key Features
- Actual OE Oxygen Sensor from Bosch
- Narrow-band heated O2 sensor for closed-loop fuel control
- Specific fit with threaded mounting
- 4-wire design with square male connector and blade terminals
- Wiring harness included
- 22 mm hex size and 18 mm thread diameter
- Metal housing with high-temperature-resistant construction
Product Details
As part of Bosch’s Actual OE Oxygen Sensor line, part number 15857 reflects Bosch’s long OE development history in oxygen sensing technology. Bosch uses ceramic sensing elements, controlled heater operation, and durable materials to maintain stable signal output under heat and vibration. This downstream sensor is engineered for the 1999-2000 Mercury Villager and 1999-2000 Nissan Quest, helping the engine management system monitor exhaust oxygen content and maintain proper combustion control.
This part cross-references Bosch OE-style applications where the same downstream sensor configuration is required.
What This Sensor Helps Address
- Check engine light related to downstream oxygen sensor performance
- Incorrect air-fuel ratio feedback to the ECU
- Rough idle or drivability issues tied to sensor signal degradation
- Increased emissions from inaccurate exhaust oxygen measurement
- Slow closed-loop response after sensor aging or contamination
Installation Notes
Fits 1999-2000 Mercury Villager, downstream, without California Emission System. Fits 1999-2000 Nissan Quest, downstream, without California Emission System. Verify connector shape, thread size, and harness routing before installation. The sensor uses a threaded mount with a 30-inch wiring harness and a 32.5-inch sealing-surface-to-connector length.
Quality Assurance
Bosch backs this oxygen sensor with OE-level engineering derived from decades of original equipment development. Part number 15857 is built to deliver consistent signal accuracy and durable operation in demanding exhaust conditions.
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2000 | Mercury | Villager | 3.3L | V6 | Downstream | without California Emission System; Actual OE Oxygen Sensor |
| 2000 | Nissan | Quest | 3.3L | V6 | Downstream | without California Emission System; Actual OE Oxygen Sensor |
| 1999 | Mercury | Villager | 3.3L | V6 | Downstream | without California Emission System; Actual OE Oxygen Sensor |
| 1999 | Nissan | Quest | 3.3L | V6 | Downstream | without California Emission System; Actual OE Oxygen Sensor |
| No rows match your filter. | ||||||