1. Kia Sportage O2 sensor

​Original part numbers and OE NO.
​Upstream(Front) Oxygen Sensor part No.：39210-2G200(for 2.4L/2.0T engines, DENSO Replacement No. 234-4381)
Downstream(Rear) Oxygen Sensor part No.: 39210-2G210 (for 2.0L diesel engine with quick heating function)
​​​​Defender Oxygen Sensor Fault Codes&Symptom Signs and Repair Recommendations
P0130/P0134(Abnormal signal/no signal)
Cause: Carbon buildup covering sensor probe or oxidized wiring harness (common for short city commutes).
Repair: Clean by soaking with oxalic acid solution (cost about $50-80), replace the sensor if it doesn't work; check the sealing of the wiring harness plug to avoid oxidization.
P0420(Catalytic converter low efficiency)
Cause: Exhaust leakage or sintered three-way catalytic converter, need to synchronously detect the difference between the front and rear oxygen signal curves (normal rear oxygen fluctuation should be significantly lower than the front oxygen).
Repair: Exhaust system leakage points, if the catalytic converter failure needs to be replaced as a whole, to avoid the replacement of separate sensors lead to misjudgment.

​​​What causes & How to repair

Urban short-distance commuting: frequent starts and stops lead to insufficient fuel combustion and carbon buildup on the sensor surface, it is recommended to use a fuel additive (e.g. Red Line SI-1) to clean the fuel line every 20,000 kilometers.
Off-road high load: severe bumps may cause the sensor wiring harness to loosen or the plug contact is poor, need to check the sealing of the sensor wiring regularly, especially after wading in water or muddy road conditions.

​How much oxygen sensor cost to replace？
Genuine parts: $400-$800 (including $150-$250 labor)
OEM parts (DENSO/NTK): $250-600 (recommended to choose models with heating function for high load conditions)

2. Kia Forte（K3） O2 sensor

​Original part numbers and OE NO.
​Upstream(Front) Oxygen Sensor part No.：39210-03AA0(for 1.4L/1.6L engines, BOSCH Replacement No. 17054)
Downstream(Rear) Oxygen Sensor part No.: 39210-03AB0 (for 1.6L diesel engine, with anti-interference shielding)
​​​​Defender Oxygen Sensor Fault Codes&Symptom Signs and Repair Recommendations

P0130 (Oxygen sensor circuit failure)
Cause: Sensor signal line is shorted or broken (commonly due to wiring harness wear).
Repair: check whether the wiring harness is broken, replace the damaged wiring harness; if the sensor itself is faulty, need to replace the original parts.
P0420 (Catalytic converter low efficiency)
Reason: Long-term use of poor-quality fuel leading to poisoning of the catalytic converter, need to be combined with data flow (such as oxygen sensor voltage fluctuation frequency) comprehensive diagnosis.
Repair: Clean the catalytic converter or replace it with new parts, and check the fuel quality at the same time.
What causes & How to repair
High-frequency use of network car: long idling time leads to sensor overheating, it is recommended to check the sensor working temperature every 10,000 kilometers.
Unstable fuel quality: Fuel with high sulfur content will easily lead to sensor poisoning, it is recommended to use high cleanliness fuel.
How much oxygen sensor cost to replace?
Genuine parts: $300-600 (including $100-180 labor fee)
OEM parts (BOSCH/NGK): $200-450 (note the appropriate engine model)

3. Kia Telluride O2 sensor

Original part numbers and OE NO.
Upstream(Front) Oxygen Sensor part No.: 39210-3CAA0 (for 3.8L V6 engine, DENSO Replacement No. 234-5082)
Downstream(Rear) Oxygen Sensor part No.: 39210-3CAB0 (for 3.8L V6 engine, with ceramic coating to prevent corrosion)
Defender Oxygen Sensor Fault Codes&Symptom Signs and Repair Recommendations
P0135 (Oxygen Sensor Heater Fault)
Cause: Broken heater circuit or blown heater wire inside sensor (common in vehicles with frequent cold starts).
Repair: Replace the sensor assembly and check if the ECU power supply is normal.
P0430 (catalytic converter low efficiency)
Cause: High temperature and high load conditions cause the catalytic converter to sinter, need to check whether the exhaust temperature is abnormal.
Repair: Replace the catalytic converter and avoid using low grade fuel.
What causes & How to repair
Long-distance travel for families with many children: The three rows of seats are fully loaded, causing the engine to run under high load, and it is recommended to clean the carbon deposits on the sensors regularly.
Towing motorhomes/trailers: extra load increases exhaust pressure, check sensor sealing.
How much oxygen sensor cost to replace?
Genuine part: $500-900 (including $200-300 labor fee)
OEM (DENSO/NTK): $350-$700 (for V6 engine)

4. Kia Sorento O2 sensor

Original part numbers and OE NO.
Upstream(Front) Oxygen Sensor part No.: 39210-2B320 (for 2.5T gasoline/2.2L diesel engine, BOSCH Replacement No. 17055)
Downstream(Rear) Oxygen Sensor part No.: 39210-2B330 (for 2.2L diesel engine, with double platinum electrodes)
Defender Oxygen Sensor Fault Codes&Symptom Signs and Repair Recommendations
P0140 (Rear Oxygen Sensor Signal Abnormal)
Cause: Aging sensor or failure of three-way catalytic converter (common in vehicles over 100,000km).
Repair: Replace the rear oxygen sensor first, and check the catalytic converter if the problem persists.
P2195 (oxygen sensor signal is thin)
Cause: Leakage in the air intake system or insufficient fuel pressure, need to check the air flow meter and fuel pump.
Repair: Check the intake manifold seals, clean the air flow meter.
What causes & How to repair
European diesel models: The high sulfur content of diesel fuel can easily lead to sensor poisoning, it is recommended to use diesel fuel additives.
Family camping: Long-term use of the rear discharge causes the sensor wiring harness to be squeezed, need to check the wiring direction.
How much oxygen sensor cost to replace?
Genuine parts: $450-$850 (including $180-$280 labor cost)
OEM (BOSCH/NGK): $300-650 (for diesel engine)

5. Kia K5 (Optima) O2 sensor

Original part numbers and OE NO.
Upstream(Front) Oxygen Sensor part No.: 39210-2B470 (for 2.0T/1.6T engine, DENSO Replacement No. 234-4381)
Downstream(Rear) Oxygen Sensor part No.: 39210-2B480 (for 2.0T engine with Quick Response Technology)
Defender Oxygen Sensor Fault Codes&Symptom Signs and Repair Recommendations
P0132 (Oxygen Sensor High Voltage)
Cause: Sensor internal short circuit or ECU failure (need to use diagnostic instrument to read the data stream).
Repair: Replace the sensor is still faulty, need to check the ECU power supply module.
P0420 (catalytic converter efficiency is low)
Cause: The catalytic converter is not sufficiently warmed up due to long-term short-distance driving, regular high-speed driving is recommended.
Repair: Use three-way catalytic cleaner (e.g. BG 208), replace the catalytic converter if not effective.
What causes & How to repair
Business commuting: Frequent cold starts cause the sensor heating wire to wear out, suggest driving at high speeds at least once a week.
Sport Mode Driving: High RPM accelerates the aging of the sensor, need to shorten the inspection cycle.
How much oxygen sensor cost to replace?
Genuine parts: $400-750 (including $150-220 labor cost)
OEM (DENSO/NTK): $250-550 (for turbocharged engines)

6. Kia Soul O2 sensor

Original part numbers and OE NO.
Upstream(Front) Oxygen Sensor part No.: 39210-2B310 (for 1.6L/2.0L engine, NGK Replacement No. 24501)
Downstream(Rear) Oxygen Sensor part No.: 39210-2B320 (for 1.6L engine, with anti-interference shielding)
Defender Oxygen Sensor Fault Codes&Symptom Signs and Repair Recommendations
P0133 (Oxygen Sensor Slow Response)
Cause: Carbon deposits or poisoning of the sensor (commonly found in urban congested road conditions).
Repair: Soak the sensor with special cleaner, replace if not effective.
P0420 (Low efficiency of catalytic converter)
Cause: Excessive fuel additives lead to clogging of the catalytic converter, avoid the use of poor quality additives.
Repair: Disassemble the catalytic converter for mechanical cleaning, and replace it if it is serious.
What causes & How to repair
Urban short-distance driving: frequent starting and stopping leads to carbon deposits on the sensors, it is recommended to clean the sensors every 15,000 kilometers.
Personalization: Modifying the exhaust system may lead to abnormal sensor signal, need to match the original parameters.
How much oxygen sensor cost to replace?
Genuine parts: $350-650 (including $120-200 labor fee)
OEM parts (NGK/BOSCH): $200-450 (for naturally aspirated engines)

7. Kia Ceed (including ProCeed) O2 sensor

Original part numbers and OE NO.
Upstream(Front) Oxygen Sensor part No.: 39210-2G380 (for 1.4T/1.6L diesel engine, BOSCH Replacement No. 17054)
Downstream(Rear) Oxygen Sensor part No.: 39210-2G390 (for 1.6L diesel engine with ceramic coating)
Defender Oxygen Sensor Fault Codes&Symptom Signs and Repair Recommendations
P0134 (Oxygen Sensor No Activity Detected)
Cause: Sensor wiring disconnection or ECU failure (need to use a multimeter to check the wiring harness on and off).
Repair: Repair wiring harness or replace sensor, check ECU software version.
P0420 (low catalytic converter efficiency)
Cause: Diesel Particulate Filter (DPF) is clogged, regeneration program is required.
Repair: Trigger DPF regeneration manually, replace catalytic converter if not effective.
What causes & How to repair
European diesel models: Frequent DPF regeneration leads to overheating of the sensor, avoid short-distance, low-speed driving.
Touring (ProCeed): Rear suspension load may crush the sensor harness, need to check the wiring fixing point.
How much oxygen sensor cost to replace?
OEM: $450-$800 (including $180-$250 labor)
OEM (BOSCH/NTK): $300-600 (for diesel engines)

8. Kia Sedona O2 sensor

Original part numbers and OE NO.
Upstream(Front) Oxygen Sensor part No.: 39210-2G600 (for 3.5L V6 engine, DENSO Replacement No. 234-5082)
Downstream(Rear) Oxygen Sensor part No.: 39210-2G610 (for 3.5L V6 engine, with dual platinum electrodes)
Defender Oxygen Sensor Fault Codes&Symptom Signs and Repair Recommendations
P0136 (Rear Oxygen Sensor Circuit Fault)
Cause: Loose sensor plug or worn out wiring (common in MPVs with frequent loading and unloading of passengers).
Repair: Tighten the plug or replace the wiring harness, and check if the sensor grounding is good.
P0420 (Catalytic converter inefficient)
Cause: Prolonged idling leads to clogging of the catalytic converter, which requires regular high speed driving.
Repair: Use three-way catalytic cleaner, replace catalytic converter if not effective.
What causes & How to repair
Family travel: seven-seat full load leads to high engine load, it is recommended to check the sensor working condition every 10,000 kilometers.
Business commuting: Frequent cold starts lead to loss of sensor heating wire, need to extend the warm-up time.
How much oxygen sensor cost to replace?
Genuine parts: $500-900 (including $200-300 labor fee)
OEM (DENSO/NTK): $350-700 (for V6 engine)

9. Kia Stinger O2 sensor

Original part numbers and OE NO.
Upstream(Front) Oxygen Sensor part No.: 39210-2G200 (for 2.0T/3.3T engine, DENSO Replacement No. 234-4381)
Downstream(Rear) Oxygen Sensor part No.: 39210-2G210 (for 3.3T engine with high temperature coating)
Defender Oxygen Sensor Fault Codes&Symptom Signs and Repair Recommendations
P0137 (Rear Oxygen Sensor Low Voltage)
Cause: Aging sensor or exhaust leak (common in performance cars with high RPM).
Repair: Replace sensor and check exhaust manifold seal.
P0420 (Catalytic converter inefficient)
Cause: Modified exhaust system causes catalytic converter mismatch, need to restore original configuration.
Repair: Replace the original catalytic converter, avoid using non-certified modifications.
What causes & How to repair
Track Driving: High RPM leads to overheating of sensors, suggest installing cooling kit.
Performance tuning: After upgrading the turbo, you need to adjust the ECU parameters to avoid sensor overload.
How much oxygen sensor cost to replace?
OEM parts: $600-1000 (including $250-350 labor fee)
OEM parts (DENSO/NTK): $400-800 (for turbocharged engines)

10. Kia Venga O2 sensor

​Original part numbers and OE NO.
​Upstream(Front) Oxygen Sensor part No.：39210-03730 (fits 1.4L/1.6L engines, BOSCH Replacement #17055)
Downstream(Rear) Oxygen Sensor part No.: 39210-03740 (for 1.6L diesel engine, with anti-interference shielding)
​​​​Defender Oxygen Sensor Fault Codes&Symptom Signs and Repair Recommendations
P0130(Faulty oxygen sensor circuit)
Cause: Aged sensor harness or oxidized plug (common in humid European climates).
Repair: Clean plug contacts and replace damaged harness.
P0420(Low catalytic converter efficiency)
Reason: High sulfur content of diesel fuel leads to poisoning of catalytic converter, need to use low sulfur diesel fuel.
Maintenance: Clean the catalytic converter or replace with new parts, check the fuel quality.
​​​What causes & How to repair
European city driving: frequent start-stop causes carbon buildup in the sensors, it is recommended to clean the sensors every 10,000 kilometers.
Elderly car: long-term low-speed driving leads to catalytic converter is not sufficiently warmed up, need to regularly high speed driving.
​How much oxygen sensor cost to replace？
Genuine parts: $300-$600 (including $100-$180 labor)
OEM parts (BOSCH/NGK): $200-$450 (for naturally aspirated engines)
Supplementary data notes
Part number adaptability: Some part numbers may be slightly adjusted due to differences in engine models and years, it is recommended to check the specific adaptability information through the VIN code.
Fault Code Diagnosis: Oxygen sensor failure may be related to the ECU software version, it is recommended to use Kia special diagnostic instrument for parameter calibration.
​How much oxygen sensor cost to replace？

Fluctuation: The cost of labor in the U.S. market is about $80-150/hour, and up to $200/hour in some European countries.
What causes & How to repair Extension: Models that use E85 ethanol gasoline for a long period of time (such as the North American version), need to choose a sensor with stronger corrosion resistance (such as DENSO 234-4381).
If you need to further verify the sensor data for a specific model, you can provide the VIN number or engine model number for an accurate search.

Provide for kia Sportage\Forte（K3）\Telluride\Sorento\K5（Optima）\Soul\Ceed（含 ProCeed）\Sedona\Stinger\Venga good price O2 sensor OEM repair carparts and auto replacement accessories oxygen sensor