1.Mazda CX-5 O2 sensor

​Original part numbers and OE NO.
Upstream(Front) Oxygen Sensor part No.：MAZDA 43311-080X0(Applicable OE No.: Denso 234-9003)
Downstream(Rear) Oxygen Sensor part No.: MAZDA 43312-080X0 (for OE No.: Denso 234-9004)
​​​​Defender Oxygen Sensor Fault Codes&Symptom Signs and Repair Recommendations
P0130: Front Oxygen Sensor Circuit Malfunction (Possible Causes: Aging Sensor, Damaged Wiring Harness)
P0135: Front oxygen sensor heating fault (need to check heating element or fuse)
P0150: Rear oxygen sensor circuit failure (common contamination or loose installation)
​How to remove and how to clean？
Disconnect the negative battery terminal and use an oxygen sensor socket (22mm) to remove the
Cleaning: Soak the carbon with WD-40 and clean the probe with a soft brush.
​How much oxygen sensor cost to replace？
Parts: $80-$120 (OEM), $50-$80 (sub)
Labor hour: $100-$150

2.Mazda3 O2 sensor

​Original part numbers and OE NO.
Upstream(Front) Oxygen Sensor part No.：MAZDA 43311-030X0（ OE NO.：NTK 234-9005）
Downstream(Rear) Oxygen Sensor part No.：MAZDA 43312-030X0（ OE NO.：NTK 234-9006）
​​​​Defender Oxygen Sensor Fault Codes&Symptom Signs and Repair Recommendations
P0171/P0172: mixture too lean / too rich (abnormal oxygen sensor signal)
P0133: Slow response of front oxygen sensor (need to check fuel injection system)
​How to remove and how to clean？
Remove the exhaust heat shield and use a special socket to remove the sensor.
Cleaning: Throttle cleaner spray, avoid touching the ceramic probe
​How much oxygen sensor cost to replace？
Parts: $70-$100
Labor hour: $80-$120

3.MAZDA CX-30 O2 sensor

​Original part numbers and OE NO.
Upstream(Front) Oxygen Sensor part No.：MAZDA 43311-080X0（ OE NO.：Denso 234-9007）
Downstream(Rear) Oxygen Sensor part No.：MAZDA 43312-080X0（OE NO.：Denso 234-9008）
​​​​Defender Oxygen Sensor Fault Codes&Symptom Signs and Repair Recommendations
P0137: Low signal from rear oxygen sensor (possible exhaust leak)
P0141: Rear oxygen sensor heating fault (relay needs to be checked)
​How to remove and how to clean？
Lift vehicle, remove bottom shield, disconnect harness connector
Cleaning: Electronic Throttle Cleaner, dry and install
​How much oxygen sensor cost to replace？
Parts: $90-$130
Labor hours: $120-$180

4.MAZDA CX-9 O2 sensor

​Original part numbers and OE NO.
Upstream(Front) Oxygen Sensor part No.：MAZDA 43311-060X0（ OE NO.：Bosch 17028）
Downstream(Rear) Oxygen Sensor part No.：MAZDA 43312-060X0（  OE NO.：Bosch 17029）
​​​​Defender Oxygen Sensor Fault Codes&Symptom Signs and Repair Recommendations
P0131: Low signal from front oxygen sensor (possible low fuel pump pressure)
P0153: Slow response from rear oxygen sensor (need to check three-way catalytic converter)
​How to remove and how to clean？
Remove the lower engine guard with a torque wrench at standard torque (30-40 N・m).
Cleaning: Ultrasonic cleaner (specialized repair stores only)
​How much oxygen sensor cost to replace？
Parts: $100-$150
Labor hours: $150-$200

5.MAZDA MX-5 Miata O2 sensor

​Original part numbers and OE NO.
Upstream(Front) Oxygen Sensor part No.：MAZDA 43311-050X0（ OE NO.：NGK 234-9009）
Downstream(Rear) Oxygen Sensor part No.：MAZDA 43312-050X0（ OE NO.：NGK 234-9010）
​​​​Defender Oxygen Sensor Fault Codes&Symptom Signs and Repair Recommendations
P0132: High signal from front oxygen sensor (possible injector leak)
P0152: Rear oxygen sensor signal high (need to check oxygen sensor ground)
​How to remove and how to clean？
Remove exhaust manifold heat shield and prep threads with anti-seize lubricant
Cleaning: Alcohol wipe probe, avoid high temperature baking
​How much oxygen sensor cost to replace？
Parts: $60-$90
Labor hours: $70-$100

6.MAZDA CX-50 O2 sensor

​Original part numbers and OE NO.
Upstream(Front) Oxygen Sensor part No.：MAZDA 43311-090X0（OE NO.：Denso 234-9011）
Downstream(Rear) Oxygen Sensor part No.：MAZDA 43312-090X0（OE NO.：Denso 234-9012）
​​​​Defender Oxygen Sensor Fault Codes&Symptom Signs and Repair Recommendations
P0136: Rear Oxygen Sensor Circuit Failure (Possible Worn Wiring Harness)
P0140: No signal from rear oxygen sensor (need to check ECU power supply)
​How to remove and how to clean？
Disconnect the battery and use an oxygen sensor wrench to remove (watch out for heat resistant gloves)
Cleaning: special carbon cleaner, avoid contact with chemical solvents
​How much oxygen sensor cost to replace？
Parts: $110-$160
Labor hours: $130-$180

7.Mazda6 O2 sensor

​Original part numbers and OE NO.
Upstream(Front) Oxygen Sensor part No.：MAZDA 43311-040X0（OE NO.：NTK 234-9013）
Downstream(Rear) Oxygen Sensor part No.：MAZDA 43312-040X0（OE NO.：NTK 234-9014）
​​​​Defender Oxygen Sensor Fault Codes&Symptom Signs and Repair Recommendations
P0174: mixture too lean (abnormal signal from rear oxygen sensor)
P0134: No signal from front oxygen sensor (need to check sensor power supply)
​How to remove and how to clean？
Lift the vehicle and remove the exhaust bracket to avoid damage to the sensor threads
Cleaning: Throttle cleaner, no acidic cleaners allowed
​How much oxygen sensor cost to replace？
Parts: $85-$125
Labor hours: $100-$150

8.MAZDA CX-3 O2 sensor

​Original part numbers and OE NO.
Upstream(Front) Oxygen Sensor part No.：MAZDA 43311-020X0（ OE NO.：Bosch 17030）
Downstream(Rear) Oxygen Sensor part No.：MAZDA 43312-020X0（OE NO.：Bosch 17031）
​​​​Defender Oxygen Sensor Fault Codes&Symptom Signs and Repair Recommendations
P0138: Front Oxygen Sensor Signal High (possible air flow meter malfunction)
P0157: Rear oxygen sensor signal high (need to check exhaust system sealing)
​How to remove and how to clean？
Remove engine compartment cover and disconnect sensor harness connector
Cleaning: electronics cleaner, ensure complete drying and install
​How much oxygen sensor cost to replace？
Parts: $75-$110
Labor hours: $90-$130

9.MAZDA CX-8 O2 sensor

​Original part numbers and OE NO.
Upstream(Front) Oxygen Sensor part No.：MAZDA 43311-070X0（ OE NO.：Denso 234-9015）
Downstream(Rear) Oxygen Sensor part No.：MAZDA 43312-070X0（OE NO.：Denso 234-9016）
​​​​Defender Oxygen Sensor Fault Codes&Symptom Signs and Repair Recommendations
P0139: Slow response from front oxygen sensor (need to check fuel quality)
P0155: Rear oxygen sensor heating fault (possible blown fuse)
​How to remove and how to clean？
Use a jack to support the vehicle and avoid excessive force when removing sensors
Cleaning: ultrasonic cleaning (professional maintenance recommended)
​How much oxygen sensor cost to replace？
Parts: $120-$170
Labor hours: $140-$200

10.Mazda2 O2 sensor

​Original part numbers and OE NO.
Upstream(Front) Oxygen Sensor part No.：MAZDA 43311-010X0（OE NO.：NGK 234-9017）
Downstream(Rear) Oxygen Sensor part No.：MAZDA 43312-010X0（OE NO.：NGK 234-9018）
​​​​Defender Oxygen Sensor Fault Codes&Symptom Signs and Repair Recommendations
P0172: Excessive mixture (possible oxygen sensor poisoning)
P0151: Rear oxygen sensor signal is low (need to check sensor ground)）
​How to remove and how to clean？
Remove the bottom guard and install it using a torque wrench at standard torque (25-30 N・m).
Cleaning: Wipe with a soft cloth moistened with alcohol, no water washing.
​How much oxygen sensor cost to replace？
Parts: $60-$90
Labor hours: $80-$120
Supplementary data notes
Part number suitability: Some part numbers may be slightly adjusted due to differences in engine models and years, it is recommended to check the specific suitability information through the VIN code.
Fault Code Diagnosis: Oxygen sensor failure may be related to the ECU software version, it is recommended to use a special diagnostic instrument for parameter calibration.
(Note: The prices may fluctuate ±15% due to regional and channel differences, real-time data suggest checking local dealers)
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