Bosch 13946 oxygen sensor for the 1994-1995 Land Rover Discovery V8 3.9L and other vehicles measures the air-fuel ratio in the exhaust and reports it to the ECU. This upstream Bosch O2 sensor is a heated, narrow-band unit, and the ECU uses its readings to keep combustion stable and help reduce emissions.
- Integrated heater element and advanced ceramic elements
- Metal housing with a TSP coating to resist vibration, corrosion and contamination
- Withstands exhaust streams up to 1,880°F
- Reaches operating temperature in under 10 seconds for quick closed-loop control
Quick facts
- Part: Bosch 13946 oxygen sensor
- Fits: 1994-1995 Land Rover Discovery V8 3.9L and other vehicles
- Position: Upstream
- Material: Metal housing
- Condition: New
A check-engine light, a rougher idle or poorer fuel economy can mean an oxygen sensor is wearing out, though other faults produce the same signs. Before you replace it, look over the sensor's wiring and connector with the engine off and cool, and have a shop read the codes if nothing looks damaged.
Fits
It fits the 1994-1995 Land Rover Discovery V8 3.9L, the 1987-1988 Land Rover Range Rover V8 3.5L, the 1989-1994 Range Rover V8 3.9L and the 1993-1994 Range Rover V8 4.2L. This listing is one sensor, and each of these takes two.
Specifications
Fit and size
- Position: upstream
- Quantity per vehicle: 2
- Thread size: M18 - 1.5
- Hex size: 22 mm
- Length (sealing surface to end of connector): 20.5 in
Build and materials
- Sensor type: narrow-band, heated
- Housing material: metal
- Wiring harness: included
- Condition: new
- Warranty: Bosch 1-year, unlimited-mileage warranty for non-commercial passenger cars and light trucks
In the box
One oxygen sensor with its wiring harness. A mounting bracket is not included.
Installation notes
- Conductive anti-seize is pre-applied to the threads.
- Direct-fit connectors are built for quick installation.
Frequently Asked Questions
Is this Range Rover oxygen sensor right for the 1987-1988 Land Rover Range Rover V8 3.5L, the 1989-1994 Range Rover V8 3.9L and the 1993-1994 Range Rover V8 4.2L?
Yes. Bosch 13946 is an upstream sensor that fits each of those years and engines. Each takes two, and this listing is one sensor.
Does this Discovery oxygen sensor fit the 1994-1995 Land Rover Discovery V8 3.9L?
Yes. Bosch 13946 fits that Discovery, which takes two upstream sensors. This listing is a single sensor.
Is this Bosch premium oxygen sensor narrow-band or wideband?
It is narrow-band. Bosch 13946 is a heated switching-type sensor that sends air-fuel-ratio readings to the ECU.
Does the Bosch 13946 sensor come with its wiring harness, and are the threads anti-seized?
Yes, it includes the wiring harness, and conductive anti-seize is pre-applied to the threads. A mounting bracket is not included.
What thread size and wrench size does this upstream oxygen sensor have?
This sensor has an M18 - 1.5 thread and a 22 mm hex. Its length from the sealing surface to the end of the connector is 20.5 in.
Published by the manufacturer of this part. Links open in a new tab.
- Brand file 5 PDF
- Brand file 5 PDF
- Brand file 5 PDF
- Brochure PDF
- Installation instructions PDF
- Technical bulletin PDF
- Warranty PDF
- Warranty PDF
- Warranty PDF
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