1.Citroen C3 O2 sensor

Original part numbers and OE NO.
Upstream(Front) Oxygen Sensor part No.：Bosch Replacement No. 1613A6 (fits 1.2T PureTech engines, VIN verification required)
Downstream(Rear) Oxygen Sensor part No.：Generic OE No. ​1613A7
​​Defender Oxygen Sensor Fault Codes & Symptom Signs
​P0130(Abnormal signal voltage): Carbon covered or fuel sulfide poisoning, it is recommended to clean it by soaking in ferric chloride solution (cost 30-50), ineffective then replace it.
​P0171​(mixture too lean): Dirty MAF sensor, need to clean and check fuel pressure.
​What causes & How to repair
Short city commute: frequent starts and stops lead to carbon buildup, it is recommended to use a fuel additive every 20,000 kilometers.
Poor fuel quality: ethanol gasoline accelerates sensor sulfur poisoning, need to replace high grade fuel.
How much oxygen sensor cost to replace？
Original parts: 220-350 (80-120 for labor)
OEM parts (Bosch/Denso): 120-220

2.Citroen C3 AIRCROSS O2 sensor

Original part numbers and OE NO.
Upstream(Front) Oxygen Sensor part No.： ​1613A8​(fits 1.5L BlueHDi diesel engine, common to C4)
Downstream(Rear) Oxygen Sensor part No.： ​1613A9​(with quick heating function, recommended for cold areas)
​​Defender Oxygen Sensor Fault Codes & Symptom Signs
​P0134​(Heating circuit disconnection): wiring harness aging or plug oxidation, measure resistance (normal 4-6Ω), replace wiring harness or sensor.
​P2271​(Signal sticking low voltage): Diesel sulfur contamination, need to clean probe and replace fuel filter.
​What causes & How to repair
​Long-distance towing: high engine load operation leads to overheating of sensors, it is recommended to install cooling guards.
Cold regions: low temperature triggers delayed heating, need to replace improved sensor.
How much oxygen sensor cost to replace？
Original parts: 250-400 (100-150 for labor)
Secondary parts: 150-280 (diesel compatibility to be verified)

3.Citroen C4 O2 sensor

Original part numbers and OE NO.
Upstream(Front) Oxygen Sensor part No.： ​1613B1​(For 1.6T EP6 engine, special tools are required for removal)
Downstream(Rear) Oxygen Sensor part No.： ​1613B2
​​Defender Oxygen Sensor Fault Codes & Symptom Signs
​P0420​(Catalytic converter inefficiency): Exhaust leakage or deviation of after-oxygen signal, exhaust sealing needs to be checked.
​P2096​(mixture too thin): Injector clogged or fuel pressure abnormal, recommend cleaning injector nozzle.
​What causes & How to repair
Ethanol gasoline use: sulfide accelerates sensor poisoning, gasoline stabilizer (e.g. Red Line SI-1) is required.
Modified exhaust: non-stock exhaust system interferes with signal, need to calibrate oxygen sensor voltage waveform.
How much oxygen sensor cost to replace？
Original parts: 280-450 (120-180 for labor)

4.Citroen C5 X O2 sensor

Original part numbers and OE NO.
Upstream(Front) Oxygen Sensor part No.: 1613C5 (high-temperature-resistant design, suitable for plug-in version with frequent start/stop conditions)
Downstream(Rear) Oxygen Sensor part No.: 1613C6 (monitoring three-way catalytic efficiency)
​​Defender Oxygen Sensor Fault Codes & Symptom Signs
P0030/P0050 (heating circuit abnormality): short circuit of wiring harness or ECU power supply failure, need to detect the power supply voltage (standard 0.45V±0.1V).
P2270 (signal sticking): fuel dilution or sensor aging, it is recommended to replace the original temperature-resistant sensor.
​What causes & How to repair
Frequent starts and stops in hybrid systems: temperature fluctuations lead to cracking of ceramic components, requiring special programming adaptations.
Track driving: high temperatures cause signal drift, regular inspection of sensor tips for carbon buildup is required.
How much oxygen sensor cost to replace？
Original parts: 350-600 (150-250 for labor)
Sub-factory parts: 250-400 (special programming tools required)
​Generic recommendations and data validation
​Part Number Verification: Verify compatibility by entering the VIN number through the Citroen EPC system or Bosch online catalog.
Diagnostic tool: Use DiagBox to read oxygen sensor voltage waveform (normal range 0.1-0.9V fluctuation).
Cost Optimization: Purchase your own sensors (e.g. RockAuto platform) to save 20%-40% on labor costs.
(Note: Prices may fluctuate ±15% due to regional and channel differences. For real-time data, we recommend checking RepairPal or local dealers)

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