1.Fiat 500 O2 sensor

Original part numbers and OE NO.
Upstream(Front) Oxygen Sensor part No.：​55212965​(Fits 1.2L Fire engine, Bosch Replacement No. 0258006XXX)
Downstream(Rear) Oxygen Sensor part No.: 55212966 (for Panda)
​​​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.
P0134 (heating circuit disconnection): wiring harness aging or plug oxidation, need to measure the heating resistance (normal value of 4-6Ω), replace the wiring harness or sensor.
​​What causes & How to repair
Short city commute: frequent starts and stops lead to carbon buildup (fuel additive every 20,000km is recommended).
Frequent start-stop of hybrid system: temperature fluctuation accelerates the aging of sensors, special temperature-resistant sensors are needed.
​How much oxygen sensor cost to replace？
Original parts: 150-300 (80-150 for labor)
OEM parts (Bosch/Denso): 80-200

2.Fiat Panda O2 sensor

Original part numbers and OE NO.
Upstream(Front) Oxygen Sensor part No.：​55212967​(for 1.3L Multijet diesel engine with sulphur-resistant coating)
Downstream(Rear) Oxygen Sensor part No.: 55212968 (common with Strada)
​​​Defender Oxygen Sensor Fault Codes & Symptom Signs
​P2271(Signal sticking low voltage): Diesel sulfur contamination or fuel dilution, need to clean probe and replace fuel filter.
P0171 (mixture too thin): MAF sensor is dirty or fuel pressure is abnormal, it is recommended to clean the air intake system.
​​What causes & How to repair
Use in cold areas: low temperatures cause delayed heating (requires replacement O2 sensor).
Driving at high altitude in mountainous areas: change in oxygen concentration triggers ECU miscalculation and requires reprogramming of parameters.
​How much oxygen sensor cost to replace？
Original parts: 180-350 (100-180 for labor)
Secondary parts: 100-250 (ACDelco brand recommended)

3.Fiat Strada O2 sensor

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Original part numbers and OE NO.
Upstream(Front) Oxygen Sensor part No.：​55212969​(fits 1.4L Fire EVO engine, OE number is common to Tipo)
Downstream(Rear) Oxygen Sensor part No.: 55212970
​​​Defender Oxygen Sensor Fault Codes & Symptom Signs
​P0420​(Catalytic converter inefficiency): Exhaust leakage or rear oxygen sensor failure, synchronized testing of front and rear oxygen signal curves is required.
P0037 (low voltage of heating circuit): oxidation of wire harness or abnormal power supply from ECU, need to measure voltage (standard 0.45V±0.1V).
​​What causes & How to repair
Heavy Duty Transportation: Continuous high load leads to overheating of the sensor, it is recommended to install a heat dissipation shield.
Poor fuel quality: Ethanol gasoline accelerates sensor sulfur poisoning, stabilizer (e.g. Red Line SI-1) is required.
​How much oxygen sensor cost to replace？
Genuine parts: 200-400 (120-200 for labor)
Secondary parts: 130-280 (diesel compatibility to be verified)

4.Fiat Tipo/Egea O2 sensor

Original part numbers and OE NO.
Upstream(Front) Oxygen Sensor part No.：​55212971​(Fits 1.6L E-Torq engines, Bosch Replacement No. 0258007XXX)
Downstream(Rear) Oxygen Sensor part No.: 55212972 (with rapid heating function)
​​​Defender Oxygen Sensor Fault Codes & Symptom Signs
​P0135​(Heating Circuit Failure): Broken wiring harness or oxidized plug, recommend replacing wiring harness (cost 50-100).
P2096 (mixture too thin): clogged injector or exhaust leak, recommend checking exhaust seal.
​​What causes & How to repair
Long-distance and high-speed driving: high temperature triggers signal drift and requires regular inspection of sensor carbon deposits.
Modified exhaust system: non-original exhaust interferes with the signal, need to calibrate the voltage waveform.
​How much oxygen sensor cost to replace？
Original parts: 250-450 (150-250 for labor)
Secondary parts (NTK/ACDelco): 160-350

5.Fiat Doblo​ O2 sensor

Original part numbers and OE NO.
Upstream(Front) Oxygen Sensor part No.：​55212973​(fits 1.8L Multijet diesel engine, OE number common to Strada)
Downstream(Rear) Oxygen Sensor part No.: 55212974 (High temperature resistant design)
​​​Defender Oxygen Sensor Fault Codes & Symptom Signs
​P2270​(Signal sticking): Fuel dilution or sensor aging, recommend replacing with higher grade fuel.
P0172 (mixture too thick): fuel pressure too high or injector leakage, need to check the fuel pump.
​​What causes & How to repair
Frequent start-stop in logistics and transportation: carbon build-up is generated quickly (it is recommended to clean the oil circuit every 15,000 kilometers).
Oil burning problem: oil vapor contaminates sensor probe, need to check piston ring sealing.
​How much oxygen sensor cost to replace？
Original parts: 280-500 (180-300 for labor)
Secondary parts: 200-400 (Bosch 15733)
Generic recommendations and data validation
Part Number Verification: Enter the VIN number to confirm compatibility through Fiat's EPC system or third-party platforms such as RockAuto.
Cost Optimization: Save 30%-50% on labor costs by purchasing the sensor yourself and then commissioning a third party to repair it.
Diagnostic tool: Use MultiECUScan to read the oxygen sensor voltage waveform (normal range: front oxygen 0.1-0.9V fluctuation, rear oxygen 0.2-0.6V stable).
(Note: The above prices may fluctuate ±15% due to regional and channel differences, real-time data suggest consulting local dealers.)

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