1. Land Rover Range Rover O2 Sensor

Range Rover (LG) / Range Rover Sport (LW)
Rear(downstream) Catalyst Heated Oxygen Sensor: part No.LR035748.
RangeRover Oxygen Sensor Fault Codes & Symptom Signs
P0042/P0043/P0044: Rear Catalyst Heated Oxygen Sensor Circuit Voltage Abnormality (Failure of Heater or Signal Line).
P0142/P0143/P0144: Rear Oxygen Sensor Signal Voltage Low/High/Response Sluggish (aging sensor or carbon buildup).
P0162/P0163/P0167: Rear oxygen sensor heater circuit shorted/disconnected (damaged wiring harness or poor plug contact).
Typical Scenario:
Trouble light illuminates after a cold start, accompanied by a rough idle or increased fuel consumption.
Part number LR035748 (Rear Catalyst Heated Oxygen Sensor) needs to be calibrated and replaced by SDD equipment.
How much oxygen sensor cost to replace ?
The OEM front oxygen sensor costs about $280-400 for the part and $150-200 for labor, for a total cost of about $430-600.

2、Land Rover Discovery O2 Sensor

Discovery 4/LR4 (LA)
Sensor Models:
Rear(downstream) Catalyst Left/Right Oxygen Sensor: Part No.LR052425 (LR052425 ( left side), LR052426 (right side).
Discovery Oxygen Sensor Fault Codes & Symptom Signs
P0142 (left side)/P0167 (right side):Abnormal rear catalyst left and right oxygen sensor signals (carbon blockage or wiring harness corrosion).
P0055: Oxygen sensor heater current overrun (burnt heating resistor or faulty ECU control module).
P0135: Front Oxygen Sensor Heater Circuit Failure (most commonly seen with loose plugs or frayed wiring harnesses).
WHAT CAUSES & HOW TO REPAIR
Excessive richness or thinness of the mixture results in excessive emissions, check part number LR052425 (left side) or LR052426(right side) sensor.
How much oxygen sensor cost to replace ?
OEM cost: About **$200-300** for a single rear oxygen sensor (part # LR052425/LR052426).
Labor Cost: Approx. **$100-$150** for replacement labor at a 4S store, may be as low as **$50-$80** at a third-party repair shop.

3. Land Rover Defender O2 Sensor

Defender 90/110/130
Defender Oxygen Sensor Fault Codes & Symptom Signs
P0130: Upstream Oxygen Sensor Signal not making sense!(sensor poisoning or broken ceramic element).
P0134: No signal from front oxygen sensor (Circuit break or ECU communication failure).
P2297 (diesel version): abnormal oxygen concentration during deceleration (sensor contaminated by fuel sulfide or EGR system failure).
What causes & How to repair
hardcore off-road rear sensors are eroded by mud and water and need to be cleaned or replaced.
Diesel models often fail due to poor fuel quality resulting in sensor "poisoning".
How much oxygen sensor cost to replace?
The total cost of a rear oxygen sensor replacement is about $350-$500 (including OEM parts and labor).

4、Land Rover Common Oxygen Sensor Fault Codes & Symptom Signs

P0130-P0147: Covers oxygen sensor signal, heater circuit, response speed and other issues, needs to be combined with data flow to determine the specific failure point.
P0037/P0038：Abnormal voltage of heater circuit (wiring harness short circuit or ECU power supply module failure).
How to repair
Use SDD device to read fault code and calibrate sensor.
Prioritize the cleaning of carbon deposits on the sensors (soaking in ferric chloride solution), and replace the original parts if it is not effective.
Check the fuel quality and injection system to avoid secondary damage caused by poor combustion.

The above information is synthesized from Land Rover technical bulletins, third-party repair cases and oxygen sensor generic fault code analysis.For model-specific VIN matching or troubleshooting procedures, it is recommended that further support be obtained through the Topix system or an authorized dealer.

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