1. Mercedes-Benz GLC-Class(including former GLK) O2 sensor

​Original part numbers and OE NO.
Upstream (Front) Oxygen Sensor part No. (Bank 1 Sensor 1):
OE No.: A0009059401 (for 2015-2023 models) .OE No.: Bosch 17028 (compatible with Denso 234-9003)
Downstream(Rear) Oxygen Sensor part No. (Bank 1 Sensor 2):
OE No.: A0009059703 (for 2015-2023 models) .OE No.: Bosch 17029 (compatible with Denso 234-9004)
​​​​Defender Oxygen Sensor Fault Codes&Symptom Signs and Repair Recommendations
P0130: Front Oxygen Sensor Circuit Malfunction (Possible Causes: Worn Wiring Harness, Poisoned Sensor)
P0135: Front oxygen sensor heating fault (need to check fuse or heating element)
P0150: Rear oxygen sensor circuit failure (common contamination or loose installation)
​How to remove and how to clean？

Tool: 22mm Oxygen Sensor Sleeve (side opening design to avoid damaging the wire harness)
Procedure: Disconnect the negative battery terminal and lift the vehicle to a safe height.
Remove the exhaust manifold heat shield and locate the Upstream (Front) Oxygen Sensor part No. (located in front of the three-way catalytic converter).
Spray WD-40 to loosen threads and unscrew sensor counterclockwise.
CLEANING: Soak carbon deposits with ferric chloride solution (5-10% concentration), soft bristle brush to clean probe, no water washing.
Apply anti-seize lubricant when installing a new sensor and torque to 30-40 N・m.

​How much oxygen sensor cost to replace？
Parts: stock front oxygen $180-$250, sub $120-$180; rear oxygen stock $150-$220, sub $90-$150.
Labor time: $120-$200 (front oxygen need to remove heat shield, labor time is higher).

2. Mercedes-Benz C-Class O2 sensor

​Original part numbers and OE NO.
Upstream(Front)Oxygen Sensor part No.（Bank 1 Sensor 1）：
Factory No.: A0009053503 (for 2014-2023 models) OE No.: NTK 234-9005 (compatible with Bosch 17030)
Downstream(Rear) Oxygen Sensor part No. (Bank 1 Sensor 2):
OE No.: A0009053603 (for 2014-2023 models) OE No.: NTK 234-9006 (compatible with Bosch 17031)
​​​​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？

Tool: 22mm Oxygen Sensor Wrench (with extension)
Remove Steps: Remove the lower engine shield and disconnect the sensor harness connector.
Use wrench to unscrew sensor counterclockwise (may burn in high temperature areas, need to loosen and loosen repeatedly).
Cleaning: Throttle cleaner spray, avoid touching ceramic probe.
When installing make sure the wiring harness is securely connected to avoid short circuits.

​How much oxygen sensor cost to replace？
Parts: stock front oxygen $160-$230, sub $100-$160; rear oxygen stock $130-$200, sub $80-$130.
Hours: $100-$150 (rear oxygen position is easier to work with).

3. Mercedes-Benz E-Class O2 sensor

​Original part numbers and OE NO.
Upstream(Front)Oxygen Sensor part No.（Bank 1 Sensor 1）：
Factory No.: A0009052900 (for 2016-2023 models) .OE No.: Bosch 17028 (compatible with Denso 234-9007)
Downstream(Rear) Oxygen Sensor part No. (Bank 1 Sensor 2):
OE No.: A0009053603 (for 2016-2023 models). OE No.: Bosch 17029 (compatible with Denso 234-9008)
​​​​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？

Tool: 22mm Oxygen Sensor Sleeve (with magnetic attachment)
remove Steps: Lift the vehicle, remove the bottom shield and locate the Downstream (Rear) Oxygen Sensor part No. (located behind the three-way catalytic converter).
Disconnect the wiring harness and unscrew the sensor counterclockwise using a socket.
Cleaning: Ultrasonic cleaner (specialized repair stores only), avoid water washing by yourself.
Check the gasket during installation and tighten to standard torque (25-30 N・m).

​How much oxygen sensor cost to replace？
Parts: stock front oxygen $200-$280, sub $140-$200; rear oxygen stock $170-$250, sub $110-$170.
Hours: $150-$220 (front oxygen is deeper, higher hours).

4. Mercedes-Benz GLE-Class (with original M)O2 sensor

​Original part numbers and OE NO.
Upstream(Front)Oxygen Sensor part No.（Bank 1 Sensor 1）：
Factory No.: A0009053503 (for 2015-2023 models) .OE No.: Denso 234-9011 (compatible with Bosch 17030)
Downstream(Rear) Oxygen Sensor part No. (Bank 1 Sensor 2):
OE No.: A0009053603 (for 2015-2023 models). OE No.: Denso 234-9012 (compatible with Bosch 17031)
​​​​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？

Tool: 22mm Oxygen Sensor Wrench (with Universal Joint)
remove Steps: Remove the exhaust manifold bracket and disconnect the sensor harness.
Use the wrench to unscrew the sensor counterclockwise (pay attention to high temperature protection).
Cleaning: Specialized carbon cleaner, avoid contact with chemical solvents.
Make sure the sensor probe is oriented correctly during installation to avoid interference with the exhaust pipe.

​How much oxygen sensor cost to replace？
Parts: stock front oxygen $220-$300, sub $150-$220; rear oxygen stock $190-$270, sub $120-$190.
Labor: $180-$250 (4WD models need to remove more guards).

5. Mercedes-Benz A-Class O2 sensor

​Original part numbers and OE NO.
Upstream(Front)Oxygen Sensor part No.（Bank 1 Sensor 1）：
Factory No.: A0009059401 (for 2018-2023 models).OE No.: Bosch 17028 (compatible with Denso 234-9003)
Downstream(Rear) Oxygen Sensor part No. (Bank 1 Sensor 2):
OE No.: A0009059703 (for 2018-2023 models).OE No.: Bosch 17029 (compatible with Denso 234-9004)
​​​​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？
Tool: 22mm Oxygen Sensor Sleeve (short shank design)
remove Steps: Disconnect the battery, remove the engine compartment cover and locate the Upstream (Front) Oxygen Sensor (located in the exhaust manifold).
Spray penetrating oil to loosen threads and unscrew sensor.
Cleaning: electronics cleaner, ensure complete drying and install.
Check harness plugs during installation to avoid oxidization.
​How much oxygen sensor cost to replace？
Parts: stock front oxygen $140-$210, sub $90-$140; rear oxygen stock $120-$180, sub $70-$120.
Hours: $80-$120 (compact cars have less room to maneuver, but lower hours).

6. Mercedes-Benz GLA-Class O2 sensor

​Original part numbers and OE NO.
Upstream(Front)Oxygen Sensor part No.（Bank 1 Sensor 1）：
Factory No.: A0009053503 (for 2013-2023 models). OE No.: NTK 234-9005 (compatible with Bosch 17030)
Downstream(Rear) Oxygen Sensor part No. (Bank 1 Sensor 2):
OE No.: A0009053603 (for 2013-2023 models) .OE No.: NTK 234-9006 (compatible with Bosch 17031)
​​​​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？
Tool: 22mm Oxygen Sensor Wrench (with ratchet function)
remove Steps: Lift the vehicle, remove the bottom shield, and disconnect the sensor harness.
Use the wrench to unscrew the sensor counterclockwise (watch out for heat resistant gloves).
Cleaning: Alcohol wipe the probe, avoid high temperature baking.
Check threads for damage during installation and replace sealing washers if necessary.
​How much oxygen sensor cost to replace？
Parts: stock front oxygen $170-$240, sub $110-$170; rear oxygen stock $140-$210, sub $90-$140.
Hours: $100-$150 (rear oxygen position is easier to work with).

7. Mercedes-Benz GLS-Class (including former GL-Class) O2 sensor

​Original part numbers and OE NO.
Upstream(Front)Oxygen Sensor part No.（Bank 1 Sensor 1）：
Factory No.: A0009052900 (fits 2012-2023 models).OE No.: Bosch 17028 (compatible with Denso 234-9007)
Downstream(Rear) Oxygen Sensor part No. (Bank 1 Sensor 2):
(Bank 1 Sensor 2): OE No.: A0009053603 (for 2012-2023 models).OE No.: Bosch 17029 (compatible with Denso 234-9008)
​​​​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？
Tool: 22mm Oxygen Sensor Sleeve (Extension)
remove Steps: Remove all three rows of seats, access the bottom of the trunk and locate the Downstream (Rear) Oxygen Sensor part No. (located in the middle of the exhaust pipe).
Disconnect the wiring harness and use the socket to unscrew the sensor (part of the exhaust part needs to be removed).
Cleaning: Professional ultrasonic cleaning (recommended for maintenance store operation).
Make sure the sensor probe is oriented correctly during installation to avoid interference with the chassis.
​How much oxygen sensor cost to replace？
Parts: stock front oxygen $250-$330, sub $180-$250; rear oxygen stock $220-$300, sub $150-$220.
Labor time: $200-$300 (more parts need to be disassembled, higher labor time).

8. Mercedes-Benz CLA-Class O2 sensor

​Original part numbers and OE NO.
Upstream(Front)Oxygen Sensor part No.（Bank 1 Sensor 1）：
Factory No.: A0009059401 (fits 2013-2023 models) .OE No.: Bosch 17028 (Denso 234-9003 compatible)
Downstream(Rear) Oxygen Sensor part No. (Bank 1 Sensor 2):
(Bank 1 Sensor 2): Factory No.: A0009059703 (for 2013-2023 models). OE No.: Bosch 17029 (compatible with Denso 234-9004)
​​​​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？
Tool: 22mm Oxygen Sensor Wrench with Magnetic Attachment
remove Steps: Remove the lower engine guard and disconnect the sensor harness.
Use the wrench to unscrew the sensor counterclockwise (be careful to prevent heat).
Cleaning: Throttle cleaner spray, acidic cleaners are prohibited.
Check for loose wiring harness plugs during installation and replace if necessary.
​How much oxygen sensor cost to replace？
Parts: stock front oxygen $190-$260, sub $130-$190; rear oxygen stock $160-$230, sub $100-$160.
Hours: $120-$180 (rear oxygen is deeper, higher hours).

9. Mercedes-Benz G-Class O2 sensor

​Original part numbers and OE NO.
Upstream(Front)Oxygen Sensor part No.（Bank 1 Sensor 1）：
Factory No.: A0009053503 (for 2018-2023 models) .OE No.: NTK 234-9005 (compatible with Bosch 17030)
Downstream(Rear) Oxygen Sensor part No. (Bank 1 Sensor 2):
OE No.: A0009053603 (for 2018-2023 models) .OE No.: NTK 234-9006 (compatible with Bosch 17031)
​​​​Defender Oxygen Sensor Fault Codes&Symptom Signs and Repair Recommendations
P0134: No signal from front oxygen sensor (need to check sensor power supply)
P0151: Rear oxygen sensor signal low (need to check sensor ground)
​How to remove and how to clean？
Tool: 22mm Oxygen Sensor Sleeve (with Universal Joint)
remove Steps: Remove the sump guard and locate the Upstream (Front) Oxygen Sensor part No. (located in the exhaust manifold).
Disconnect the wiring harness and use a wrench to unscrew the sensor (may burn in hot areas and need to be loosened and tightened repeatedly).
Cleaning: soft cloth dipped in alcohol wipe, prohibit water washing.
Apply anti-seize lubricant during installation and tighten to standard torque (25-30 N・m).
​How much oxygen sensor cost to replace？
Parts: stock front oxygen $230-$310, sub $160-$230; rear oxygen stock $200-$280, sub $130-$200.
Hours: $150-$220 (hardcore off-road models have limited room to maneuver).

10. Mercedes-Benz B-Class O2 sensor

​Original part numbers and OE NO.
Upstream(Front)Oxygen Sensor part No.（Bank 1 Sensor 1）：
Factory No.: A0009059401 (for 2018-2023 models) .OE No.: Bosch 17028 (compatible with Denso 234-9003)
Downstream(Rear) Oxygen Sensor part No. (Bank 1 Sensor 2):
OE No.: A0009059703 (for 2018-2023 models) .OE No.: Bosch 17029 (compatible with Denso 234-9004)
​​​​Defender Oxygen Sensor Fault Codes&Symptom Signs and Repair Recommendations
P0172: Excessive mixture (possible oxygen sensor poisoning)
P0151: low signal from rear oxygen sensor (need to check sensor ground)
​How to remove and how to clean？
Tool: 22mm Oxygen Sensor Wrench (short handle design)
remove Steps: Remove the bottom shield and disconnect the sensor harness.Use wrench to unscrew sensor counterclockwise.
CLEANING: Electronics cleaner, make sure it is completely dry.Check sealing gasket during installation and replace if necessary.
​How much oxygen sensor cost to replace？
Parts: stock front oxygen $160-$230, sub $100-$160; rear oxygen stock $130-$200, sub $80-$130.
Hours: $90-$140 (compact cars are easy to operate).
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 above prices may fluctuate ±15% due to regional and channel differences, real-time data suggest checking local dealers)
Provide for Mercedes-Benz GLC-Class（incl. former GLK）\C-Class\E-Class\GLE-Class（incl. former M ）\A-Class\GLA-Class\GLS-Class（incl. former GL）\CLA-Class\G-Class\B-Class good price O2 sensor OEM repair carparts and auto replacement accessories oxygen sensor