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Bosch 12018 Oxygen Sensor - Downstream Left
| Brand | Bosch 12018 |
|---|---|
| Position | Downstream Left |
| Wiring Harness Length | 20.5 |
| Terminal Type | Blade |
| Universal Or Specific Fit | Specific |
| Wire Quantity | 4 |
| Grade Type | Standard replacement |
| Connector Shape | Rectangle |
| Terminal Quantity | 4 |
| Connector Gender | Male |
| Terminal Gender | Male |
| Overall Length | 23.6 |
| Mounting Type | Threaded |
| Automotive Color / Finish | Steel |
| Automotive Item Weight (lbs) | 0.20503 lb |
| Heated (Oxygen Sensor) | Yes |
| Hex Size (Oxygen Sensor) | 22 mm |
| Housing Material | Metal |
| Length (Sealing Surface To End Of Connector) | 22.4 in |
| Mounting Bracket Included | No |
| Oxygen Sensor Type | Direct fit |
| Sensor Type | Narrow-band |
| Thread Diameter (Oxygen Sensor) | 18 mm |
| Thread Size | 18 |
| Wiring Harness Included | Yes |
| Product line | Actual OE Oxygen Sensor |
| Fits | Land Rover · 3 vehicles |
Direct-fit replacement. Matches the listed downstream left application for a clean, specific installation.
Heated narrow-band design. Supports faster closed-loop operation and stable air-fuel feedback.
Bosch OE heritage. Built from decades of oxygen sensor development and OE supply experience.
Cross-references LR052425 and T2R54608 for the same application. See all 2.
Bosch 12018 Oxygen Sensor
Bosch 12018 is a direct-fit, heated narrow-band oxygen sensor built for precise air-fuel-ratio feedback to the ECU. It is a specific-fit replacement for the downstream left position on select Land Rover LR4 models, including 2014-2016 applications.
Key Features
- Direct fit oxygen sensor for straightforward replacement
- Heated narrow-band design for faster closed-loop operation
- 4-wire harness with blade terminals and rectangle connector
- Threaded mounting with 18 mm thread diameter and 22 mm hex size
- Steel-finish, metal-housed sensor with included wiring harness
- Specific fit application for downstream left placement
Product Details
Built under Bosch’s Actual OE Oxygen Sensor line, part number 12018 uses advanced ceramic sensing elements and controlled heater operation to deliver stable signal output across changing exhaust temperatures. Bosch has decades of OE oxygen sensor development behind this design, and the sensor construction is intended to maintain accurate lambda feedback under heat and vibration. For buyers searching Bosch 12018 oxygen sensor or a Land Rover LR4 downstream left oxygen sensor, this replacement matches the direct-fit format used in the listed application.
This part cross-references LR052425 and T2R54608 for the same application.
What It Helps Address
- Check engine light related to oxygen sensor signal faults
- Rough idle or unstable air-fuel control from a worn sensor
- Delayed closed-loop response after startup
- Emissions test failures tied to inaccurate exhaust feedback
- Fuel trim issues caused by slow or inconsistent sensor output
Installation Notes
Install in the downstream left position only for the listed fitment. Verify the 4-wire connector, threaded mounting style, and harness length before installation, and inspect the exhaust bung threads for damage or contamination. Use proper oxygen sensor service tools and follow vehicle-specific torque procedures.
Quality Assurance
Bosch supplies this oxygen sensor as an OE-proven replacement backed by more than five decades of oxygen sensor development. The design uses high-temperature-resistant materials and heater control strategies intended to maintain consistent operation in demanding exhaust conditions.
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2016 | Land Rover | LR4 | 3.0L | V6 | Downstream Left | Actual OE Oxygen Sensor |
| 2015 | Land Rover | LR4 | 3.0L | V6 | Downstream Left | Actual OE Oxygen Sensor |
| 2014 | Land Rover | LR4 | 3.0L | V6 | Downstream Left | Actual OE Oxygen Sensor |
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