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Bosch 12112 Oxygen Sensor - Downstream or Upstream
| Brand | Bosch 12112 |
|---|---|
| Position | Upstream and Downstream |
| Wiring Harness Length | 17.6 |
| Terminal Type | Blade |
| Universal Or Specific Fit | Specific |
| Wire Quantity | 1 |
| Grade Type | Standard replacement |
| Connector Shape | Round |
| Terminal Quantity | 1 |
| Connector Gender | Male |
| Terminal Gender | Male |
| Overall Length | 21.3 |
| Mounting Type | Flange |
| Automotive Color / Finish | Steel |
| Automotive Item Weight (lbs) | 0.180779 lb |
| Heated (Oxygen Sensor) | No |
| Hex Size (Oxygen Sensor) | 22 mm |
| Housing Material | Metal |
| Length (Sealing Surface To End Of Connector) | 20.1 in |
| Mounting Bracket Included | No |
| Oxygen Sensor Type | Narrow-band non-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 | Geo, Lexus, and Toyota · 51 vehicles |
Standard replacement. Direct-fit oxygen sensor for straightforward service.
Narrow-band design. Provides precise air-fuel-ratio readings for stable combustion control.
Bosch OE heritage. Backed by decades of OE development and proven sensor technology.
Cross-references 8946519525, 8946519625 and 8946529505 for the same application. See all 6.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
Bosch Oxygen Sensor for Toyota and Lexus
Bosch Part Number 12112 is a specific-fit narrow-band oxygen sensor for select Toyota, Lexus, and Geo applications. It provides the ECU with air-fuel-ratio feedback for stable closed-loop fuel control and lower emissions.
Key Features
- Bosch Engineered Oxygen Sensor line with OE development heritage
- Narrow-band, non-heated switching-type O2 sensor
- Specific-fit design with round connector and male terminals
- Flange mounting style with 18 mm thread diameter and 22 mm hex size
- Wiring harness included for direct replacement use
- Built with high-temperature-resistant materials and ceramic sensing elements
- Part number 12112 for easy identification and ordering
Product Details
Bosch 12112 is built for upstream and downstream applications where precise oxygen-content feedback is needed to help the engine control module maintain the correct air-fuel mixture. Bosch’s oxygen sensor program traces back to its early OE sensor development and later planar narrowband designs, which improved response time and closed-loop operation. This sensor is a standard replacement choice for vehicles such as the Toyota Camry, Toyota Celica, Toyota Corolla, Toyota MR2, Toyota Supra, Lexus ES300, Lexus GS300, Lexus SC300, and Geo Prizm in the listed positions.
This part cross-references 8946519525 and 8946519625 for the same application.
What It Helps Address
- Check engine light related to oxygen sensor performance
- Rich or lean fuel mixture readings
- Slow sensor response affecting fuel control
- Failed emissions inspection tied to sensor output
- Rough idle or unstable closed-loop operation
Installation Notes
Verify the connector shape, terminal style, thread size, and mounting style before installation. This sensor is a specific-fit replacement, so confirm the vehicle application and position match the listing. Use the existing harness routing and inspect nearby exhaust components for heat damage or corrosion before installing the new sensor.
Quality Assurance
Bosch backs this oxygen sensor with more than five decades of OE sensor development and aftermarket supply experience. The design uses durable materials and optimized heater-control engineering from Bosch’s oxygen sensor program to support consistent signal output under demanding thermal and vibration conditions.
| Year | Make | Model | Submodel | Body Type | Drive Type | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|---|---|---|
| 1995 | Geo | Prizm | — | — | — | 1.6L | L4 | Upstream | Alternative Fit 2; with California Emission System; Bosch Engineered Oxygen Sensor |
| 1995 | Lexus | SC300 | — | — | — | 3.0L | L6 | Upstream | Located on Bottom; Bosch Engineered Oxygen Sensor |
| 1995 | Toyota | Camry | — | — | — | 2.2L | L4 | Upstream | Alternative Fit 2; without California Emission System; Bosch Engineered Oxygen Sensor |
| 1995 | Toyota | Camry | — | — | — | 2.2L | L4 | Upstream | Alternative Fit 2; with California Emission System; Bosch Engineered Oxygen Sensor |
| 1995 | Toyota | Celica | — | — | — | 1.8L | L4 | Upstream | Alternative Fit 2; Bosch Engineered Oxygen Sensor |
| 1995 | Toyota | Celica | — | — | — | 2.2L | L4 | Upstream | Alternative Fit 2; with California Emission System; Bosch Engineered Oxygen Sensor |
| 1995 | Toyota | Celica | — | — | — | 2.2L | L4 | Upstream | Alternative Fit 2; without California Emission System; Bosch Engineered Oxygen Sensor |
| 1995 | Toyota | Corolla | — | — | — | 1.6L | L4 | Upstream | Alternative Fit 2; with California Emission System; Bosch Engineered Oxygen Sensor |
| 1995 | Toyota | MR2 | — | — | — | 2.2L | L4 | Upstream | Bosch Engineered Oxygen Sensor |
| 1995 | Toyota | Supra | — | — | — | 3.0L | L6 | Upstream | without California Emission System; Bosch Engineered Oxygen Sensor |
| 1994 | Geo | Prizm | — | — | — | 1.6L | L4 | Upstream | Alternative Fit 2; with California Emission System; Bosch Engineered Oxygen Sensor |
| 1994 | Geo | Prizm | — | — | — | 1.8L | L4 | Upstream | Alternative Fit 2; with California Emission System; Bosch Engineered Oxygen Sensor |
| 1994 | Lexus | GS300 | — | — | — | 3.0L | L6 | Upstream | without California Emission System; Bosch Engineered Oxygen Sensor |
| 1994 | Lexus | GS300 | — | — | — | 3.0L | L6 | Downstream | without California Emission System; Bosch Engineered Oxygen Sensor |
| 1994 | Lexus | SC300 | — | — | — | 3.0L | L6 | Upstream | To 12/1993; Bosch Engineered Oxygen Sensor |
| 1994 | Lexus | SC300 | — | — | — | 3.0L | L6 | Upstream | From 01/1994; Located on Bottom; Bosch Engineered Oxygen Sensor |
| 1994 | Toyota | Camry | — | — | — | 2.2L | L4 | Upstream | Alternative Fit 2; without California Emission System; Bosch Engineered Oxygen Sensor |
| 1994 | Toyota | Camry | — | — | — | 2.2L | L4 | Upstream | Alternative Fit 2; with California Emission System; Bosch Engineered Oxygen Sensor |
| 1994 | Toyota | Celica | — | — | — | 2.2L | L4 | Upstream | Alternative Fit 2; with California Emission System; Bosch Engineered Oxygen Sensor |
| 1994 | Toyota | Celica | — | — | — | 1.8L | L4 | Upstream | Alternative Fit 2; Bosch Engineered Oxygen Sensor |
| 1994 | Toyota | Celica | — | — | — | 2.2L | L4 | Upstream | Alternative Fit 2; without California Emission System; Bosch Engineered Oxygen Sensor |
| 1994 | Toyota | Corolla | — | — | — | 1.8L | L4 | Upstream | Alternative Fit 2; with California Emission System; Bosch Engineered Oxygen Sensor |
| 1994 | Toyota | Corolla | — | — | — | 1.6L | L4 | Upstream | Alternative Fit 2; with California Emission System; Bosch Engineered Oxygen Sensor |
| 1994 | Toyota | MR2 | — | — | — | 2.2L | L4 | Upstream | Bosch Engineered Oxygen Sensor |
| 1994 | Toyota | Supra | — | — | — | 3.0L | L6 | Upstream | without California Emission System; Bosch Engineered Oxygen Sensor |
| 1993 | Geo | Prizm | — | — | — | 1.6L | L4 | Upstream | Alternative Fit 2; with California Emission System; Bosch Engineered Oxygen Sensor |
| 1993 | Geo | Prizm | — | — | — | 1.8L | L4 | Upstream | Alternative Fit 2; with California Emission System; Bosch Engineered Oxygen Sensor |
| 1993 | Lexus | ES300 | — | — | — | 3.0L | V6 | Upstream | Alternative Fit 1; without California Emission System; Bosch Engineered Oxygen Sensor |
| 1993 | Lexus | ES300 | — | — | — | 3.0L | V6 | Upstream | Alternative Fit 1; with California Emission System; with Flange; Bosch Engineered Oxygen Sensor |
| 1993 | Lexus | GS300 | — | — | — | 3.0L | L6 | Upstream | without California Emission System; Bosch Engineered Oxygen Sensor |
| 1993 | Lexus | GS300 | — | — | — | 3.0L | L6 | Downstream | without California Emission System; Bosch Engineered Oxygen Sensor |
| 1993 | Lexus | SC300 | — | — | — | 3.0L | L6 | Upstream | Bosch Engineered Oxygen Sensor |
| 1993 | Toyota | Camry | — | — | — | 2.2L | L4 | Upstream | without California Emission System; Bosch Engineered Oxygen Sensor |
| 1993 | Toyota | Camry | — | — | — | 2.2L | L4 | Upstream | Alternative Fit 2; with California Emission System; Bosch Engineered Oxygen Sensor |
| 1993 | Toyota | Camry | — | — | — | 3.0L | V6 | Upstream | Alternative Fit 1; Bosch Engineered Oxygen Sensor |
| 1993 | Toyota | Celica | — | — | — | 2.2L | L4 | Upstream | Alternative Fit 2; Bosch Engineered Oxygen Sensor |
| 1993 | Toyota | Corolla | — | — | FWD | 1.6L | L4 | Upstream | Alternative Fit 2; with California Emission System; Bosch Engineered Oxygen Sensor |
| 1993 | Toyota | Corolla | — | — | — | 1.8L | L4 | Upstream | Alternative Fit 2; with California Emission System; Bosch Engineered Oxygen Sensor |
| 1993 | Toyota | MR2 | — | — | — | 2.2L | L4 | Upstream | Bosch Engineered Oxygen Sensor |
| 1993 | Toyota | Supra | — | — | — | 3.0L | L6 | Upstream | without California Emission System; Bosch Engineered Oxygen Sensor |
| 1992 | Lexus | ES300 | — | — | — | 3.0L | V6 | Upstream | Alternative Fit 1; without California Emission System; Bosch Engineered Oxygen Sensor |
| 1992 | Lexus | ES300 | — | — | — | 3.0L | V6 | Upstream | Alternative Fit 1; with California Emission System; with Flange; Bosch Engineered Oxygen Sensor |
| 1992 | Lexus | SC300 | — | — | — | 3.0L | L6 | Upstream | Bosch Engineered Oxygen Sensor |
| 1992 | Toyota | Camry | — | — | — | 2.2L | L4 | Upstream | Alternative Fit 2; with California Emission System; Bosch Engineered Oxygen Sensor |
| 1992 | Toyota | Camry | — | — | — | 2.2L | L4 | Upstream | without California Emission System; Bosch Engineered Oxygen Sensor |
| 1992 | Toyota | Camry | — | — | — | 3.0L | V6 | Upstream | Alternative Fit 1; Bosch Engineered Oxygen Sensor |
| 1992 | Toyota | Celica | GTS | — | — | 2.2L | L4 | Upstream | Alternative Fit 2; Bosch Engineered Oxygen Sensor |
| 1992 | Toyota | Celica | — | Convertible | — | 2.2L | L4 | Upstream | Alternative Fit 2; Bosch Engineered Oxygen Sensor |
| 1992 | Toyota | Celica | GT | Hatchback | — | 2.2L | L4 | Upstream | Alternative Fit 2; Bosch Engineered Oxygen Sensor |
| 1992 | Toyota | Celica | — | Coupe | — | 2.2L | L4 | Upstream | Alternative Fit 2; Bosch Engineered Oxygen Sensor |
| 1992 | Toyota | MR2 | — | — | — | 2.2L | L4 | Upstream | From 01/1992; Bosch Engineered Oxygen Sensor |
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