1.INFINITI QX60(Former JX)​ O2 sensor

​Original part numbers and OE NO.
​Upstream(Front) Oxygen Sensor part No.：​234-5095(for 3.5L V6 engine, DENSO Replacement No. 234-4381)
Downstream(Rear) Oxygen Sensor part No.: 234-8020(common with QX80, high temperature resistant design)
​​​​Defender Oxygen Sensor Fault Codes & Symptom Signs
​P0130/P0134​(Abnormal signal/no signal): Carbon covered or plug oxidized, recommend cleaning by soaking in oxalic acid solution (cost 50-80)
P0420 (catalytic converter efficiency is low): three-way catalytic converter sintering or exhaust leakage, need to synchronously detect the difference between before and after oxygen signal curve
​​​What causes & How to repair
Short distance in urban congestion: frequent starting and stopping leads to carbon buildup, it is recommended to use fuel additives (e.g. Red Line SI-1) every 20,000km.
Hybrid mode: temperature fluctuations accelerate sensor aging, need to use temperature-resistant sensors
​How much oxygen sensor cost to replace？
Original parts: 400-850 (150-250 for labor)
Sub-factory parts (DENSO/NTK): 250-600

2.INFINITI QX50(Former EX)​ O2 sensor

​Original part numbers and OE NO.
​Upstream(Front) Oxygen Sensor part No.：​22693-3AA0A(for 2.0T VC-Turbo engine, DENSO Replacement No. 234-9148)
Downstream(Rear) Oxygen Sensor part No.: 22694-3AA0A(with quick heating function)
​​​​Defender Oxygen Sensor Fault Codes & Symptom Signs
​P2271(Signal viscous low voltage): ethanol gasoline sulfur pollution triggered, need to replace the high grade fuel and clean the probe
P0171/P0172 (mixture too thin/thick): Check fuel pump pressure (normal value 3.5-4.0 bar).
​​​What causes & How to repair
High altitude: change in oxygen concentration triggers ECU miscalculation and requires reprogramming of parameters
Low-temperature start: delayed heating circuit, need to replace Bosch 15733 series sensor
​How much oxygen sensor cost to replace？
Original parts: 350-700 (120-200 labor hours)
Sub-factory parts: 200-500
​

3.INFINITI Q50(Former G)​ O2 sensor

​Original part numbers and OE NO.
​Upstream(Front) Oxygen Sensor part No.：​22693-JK00A(Fit 3.0T V6 twin-turbo engine, OE number common to Q60)
Downstream(Rear) Oxygen Sensor part No.: 22694-JK00A(High temperature resistant design)
​​​​Defender Oxygen Sensor Fault Codes & Symptom Signs
​P0135(Heating circuit failure): wire harness oxidation or ECU power supply abnormality, need to measure the voltage (standard 0.45V ± 0.1V)
P0030 (Heating Circuit Disconnection): Abnormal wiring harness resistance in low temperature environment, need to replace the improved sensor
​​​What causes & How to repair
​Track Driving: High RPMs cause sensor overheating, recommend installing a heat shield
Ethanol gasoline use: sulfide accelerated sensor poisoning, need to add stabilizer
​How much oxygen sensor cost to replace？
Original parts: 450-900 (180-300 for labor)
Sub-factory parts (DENSO/ACDelco): 300-650

4.INFINITI QX80(Former QX56)​ O2 sensor

​Original part numbers and OE NO.
​Upstream(Front) Oxygen Sensor part No.：​234-5095(for 5.6L V8 engine, DENSO Replacement No. 234-4381)
Downstream(Rear) Oxygen Sensor part No.: 234-8020(common with QX60)
​​​​Defender Oxygen Sensor Fault Codes & Symptom Signs
​P0134​(Heating circuit disconnection): wiring harness aging or loose plug, need to measure the heating resistance (normal value of 4-6Ω)
P0172 (mixture too thick): fuel pressure is too high or injector leakage, need to check the fuel system
​​​What causes & How to repair
Heavy-duty towing: persistent high loads cause sensors to overheat, exhaust system check every 50,000 kilometers recommended
Off-road bumps: violent vibration causes the plug to loosen, need to strengthen the wiring harness fixing
​How much oxygen sensor cost to replace？
Original parts: 500-1,100 (200-350 for labor)
Sub-factory parts: 350-800

5.INFINITI QX70(Former FX)​ O2 sensor

​Original part numbers and OE NO.
​Upstream(Front) Oxygen Sensor part No.：​22693-9X00A​(for 3.7L V6 engine, DENSO Replacement No. 234-9148)
Downstream(Rear) Oxygen Sensor part No.: 22694-9X00A(with quick heating function)
​​​​Defender Oxygen Sensor Fault Codes & Symptom Signs
​P0420(Catalytic converter inefficiency): Carbon buildup on sensor or cracked ceramic, recommend cleaning or replacement
P0130 (abnormal signal voltage): fuel sulfide poisoning, recommend soaking and cleaning
​​​What causes & How to repair
​High-speed cruising: high temperature triggers signal drift, need to regularly check the sensor carbon buildup
Oil burning problem: oil vapor contaminates sensor probe, need to check piston ring sealing
​How much oxygen sensor cost to replace？
Original parts: 380-750 (150-250 for labor)
Sub-factory parts: 250-550

6.INFINITI Q60(Former G Coupe)​ O2 sensor

​Original part numbers and OE NO.
​Upstream(Front) Oxygen Sensor part No.：​22693-1LA0A​(fits 3.0T twin-turbo engine, OE number common to Q50)
Downstream(Rear) Oxygen Sensor part No.: 22694-1LA0A(for High Performance version)
​​​​Defender Oxygen Sensor Fault Codes & Symptom Signs
​P2270(Signal sticking): Diesel sulfur contamination or fuel dilution, need to clean the probe and replace the fuel filter element
P2096 (mixture too thin): Check exhaust sealing and MAF sensor cleanliness.
​​​What causes & How to repair
​Modified exhaust system: non-factory exhaust interference signal, need to calibrate voltage waveforms
Cold regions: low temperature causes heating delay, need to replace the rapid heating type sensor
​How much oxygen sensor cost to replace？
Original parts: 420-850 (180-300 for labor)
Sub-factory parts: 280-650

7.INFINITI Q70(Former M)​ O2 sensor

​Original part numbers and OE NO.
​Upstream(Front) Oxygen Sensor part No.：​22693-5SA0A​(for 5.6L V8 engine, DENSO Replacement No. 234-5095)
Downstream(Rear) Oxygen Sensor part No.: 22694-5SA0A(High Temperature Resistant Design)
​​​​Defender Oxygen Sensor Fault Codes & Symptom Signs
​P0135​(Heating circuit failure): Measure the heating resistance (normal value of 4-6Ω), replace the wiring harness
P0171/P0172 (mixture too thin / too rich): check the air intake system sealing and fuel pressure
​​​What causes & How to repair
Luxury long-distance driving: high temperature triggers signal drift, need to regularly check the sensor carbon buildup
Ethanol gasoline use: sulfide accelerated sensor poisoning, need to add stabilizers
​How much oxygen sensor cost to replace？
Original parts: 450-950 (200-350 for labor)
Sub-factory parts: 300-700
​Generic recommendations and data validation

Part Number Verification: Confirm compatibility by entering the VIN number through the INFINITI EPC system or a third-party platform (e.g. RockAuto);
Diagnostic tool: Use CONSULT-III+ to read the oxygen sensor voltage waveform (0.1-0.9V fluctuation for front oxygen, 0.2-0.6V stable for rear oxygen);
Cost optimization: Purchasing the sensor by yourself can save 20%-40% of the labor cost, but it should be noted that plug-in hybrid models need special programming;
Technology upgrade: Shengmid Technology's new 4O2-LF-M sensor (resolution 0.05%vol) is suitable for high-precision testing scenarios.
(Note: The above prices may fluctuate ±15% due to regional and channel differences, real-time data suggest checking INFINITI dealers)

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