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Bosch 15409 Oxygen Sensor - Downstream
| Brand | Bosch 15409 |
|---|---|
| Position | Downstream |
| Wiring Harness Length | 40.8 |
| Terminal Type | Blade |
| Universal Or Specific Fit | Specific |
| Wire Quantity | 4 |
| Grade Type | Standard replacement |
| Connector Shape | Rectangle |
| Terminal Quantity | 4 |
| Connector Gender | Female |
| Terminal Gender | Female |
| Overall Length | 44.5 |
| Mounting Type | Threaded |
| Automotive Color / Finish | Steel |
| Automotive Item Weight (lbs) | 0.399037 lb |
| Heated (Oxygen Sensor) | Yes |
| Hex Size (Oxygen Sensor) | 22 mm |
| Housing Material | Metal |
| Length (Sealing Surface To End Of Connector) | 43.3 in |
| Mounting Bracket Included | No |
| Oxygen Sensor Type | Narrow-band heated |
| Sensor Type | Narrow-band |
| Thread Diameter (Oxygen Sensor) | 18 mm |
| Thread Size | 18 |
| Wiring Harness Included | Yes |
| Product line | Bosch Engineered Oxygen Sensor |
| Fits | Honda · 1 vehicle |
OE-proven quality. Bosch brings decades of original-equipment development to the aftermarket.
Heated narrow-band design. Delivers quicker closed-loop response and stable air-fuel control.
Threaded metal housing. Built with high-temperature materials for harsh thermal and vibration loads.
Cross-references 36532RAAA11 for the same application. See all 1.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
Bosch Oxygen Sensor for Honda Accord
Bosch Part Number 15409 is a specific-fit, narrow-band heated oxygen sensor for the 2003 Honda Accord, downstream position. It monitors exhaust oxygen content and sends precise air-fuel-ratio data to the ECU to support stable closed-loop fuel control and lower emissions.
Built under the Bosch Engineered Oxygen Sensor line, this sensor reflects Bosch’s long OE development history in oxygen sensing technology. The design uses a ceramic sensing element, optimized heater control, and high-temperature-resistant materials for consistent signal output in demanding thermal and vibration conditions.
Key Features
- Fits 2003 Honda Accord, downstream
- Bosch Engineered Oxygen Sensor line
- Part Number 15409
- Narrow-band heated oxygen sensor
- 4-wire design with included wiring harness
- Threaded mounting with 18 mm thread diameter
- 22 mm hex size for service access
- Rectangle female connector with blade terminals
- Standard replacement grade
How It Works
This Bosch oxygen sensor measures residual oxygen in the exhaust stream and relays that information to the engine control unit so fuel delivery can be adjusted during closed-loop operation. For a 2003 Honda Accord downstream oxygen sensor replacement, Bosch Part Number 15409 provides the OE-style signal response expected for emissions monitoring and fuel control.
This part cross-references Honda 36532RAAA11 for the same application.
Common Issues It May Address
- Check engine light related to oxygen sensor performance
- Rough idle caused by inaccurate exhaust oxygen readings
- Increased emissions from delayed or unstable sensor response
- Poor fuel control during closed-loop operation
- Fault codes tied to downstream sensor signal issues
Installation Notes
Confirm downstream placement before installation and verify the connector shape, terminal count, and harness length against the original sensor. The threaded design uses an 18 mm thread size and 22 mm hex, so proper oxygen sensor service tools are recommended for removal and installation. Inspect the exhaust bung threads and wiring routing before final tightening.
Quality Assurance
Bosch supplies oxygen sensors with OE development experience dating back to its original sensor designs and later planar narrowband technology. Bosch Part Number 15409 is built as a standard replacement sensor using materials and heater control strategies intended to maintain consistent operation under heat and vibration.
| Year | Make | Model | Body Type | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|---|
| 2003 | Honda | Accord | Coupe | 2.4L | L4 | Downstream | Bosch Engineered Oxygen Sensor |
| No rows match your filter. | |||||||