1. Mitsubishi Outlander O2 sensor

Original part numbers and OE NO.
Upstream(Front)Oxygen Sensor part No.（Bank 1 Sensor 1）：
OE number: MD365014 (for models 2008-2018)
OE No.: Bosch 18074 (compatible with NTK 25198)
Downstream(Rear) Oxygen Sensor part No. (Bank 1 Sensor 2):
OE No.: MD365015 (for 2008-2018 models)
OE No.: Bosch 17187 (compatible with Denso 234-9008)

Defender Oxygen Sensor Fault Codes&Symptom Signs
P0130: Front Oxygen Sensor Circuit Malfunction (Worn Harness or Poisoned Sensor)
P0135: Front oxygen sensor heating fault (blown fuse or damaged heating element)
P0171/P0172: Over-thinning / over-concentration of mixture (abnormal sensor signal)

How to remove and how to clean？
Remove Tool:22mm Oxygen Sensor Sleeve (with Magnetic Attachment)
Remove Steps:Disconnect the negative battery terminal and lift the vehicle to a safe height.
Remove the exhaust manifold heat shield and locate the front oxygen sensor (located in front of the three-way catalyzer).
Spray WD-40 to loosen the threads and unscrew the sensor counterclockwise.
Cleaning: Soak the carbon with ferric chloride solution (5-10% concentration), clean the probe with a soft brush, no water washing.
Apply anti-seize lubricant when installing, and tighten with 30-40 N・m torque.

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. Mitsubishi Eclipse Cross O2 sensor

Original part numbers and OE NO.
Upstream(Front)Oxygen Sensor part No.（Bank 1 Sensor 1）：
OE number: MD365014 (for 2018-2023 models)
OE No.: Bosch 18074 (compatible with NTK 25198)
Downstream (Rear) Oxygen Sensor part No. (Bank 1 Sensor 2):
OE No.: MD365015 (for 2018-2023 models)
OE No.: Bosch 17187 (compatible with Denso 234-9008)

Defender Oxygen Sensor Fault Codes&Symptom Signs
P0136: Rear Oxygen Sensor Circuit Failure (Wiring Harness Deteriorated or Loose Installation)
P0140: No signal from rear oxygen sensor (ECU power supply needs to be checked)
P0153: Rear oxygen sensor response slow (clogged three-way catalytic converter)

How to remove and how to clean？
Remove Tool:22mm Oxygen sensor wrench (with universal joint)
Remove Steps:Remove the bottom shield and disconnect the sensor harness.
Use a wrench to unscrew the sensor counterclockwise (may burn in high temperature area, need to loosen and tighten repeatedly)。
Cleaning: ultrasonic cleaner (professional repair stores only), avoid washing by yourself.
Check the gasket during installation and tighten according to standard torque (25-30 N・m).

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).

3. Mitsubishi Mirage O2 sensor

Original part numbers and OE NO.
Upstream(Front)Oxygen Sensor part No.（Bank 1 Sensor 1）：
OE No.: MD365014 (for models 2012-2023)
OE No.: Bosch 18074 (compatible with NTK 25198)
Downstream(Rear) Oxygen Sensor part No. (Bank 1 Sensor 2)
(Bank 1 Sensor 2): OE No.: MD365015 (for 2012-2023 models)
OE No.: Bosch 17187 (compatible with Denso 234-9008)

Defender Oxygen Sensor Fault Codes&Symptom Signs
P0131: Low signal from front oxygen sensor (insufficient fuel pump pressure)
P0151: Low signal from rear oxygen sensor (exhaust leak)
P0171: mixture too lean (air flow meter malfunction)

How to remove and how to clean？
Remove Tool:22mm Oxygen Sensor Sleeve (Short Shank Design)
Remove Steps:Remove the lower engine guard and disconnect the sensor harness.
Use the socket to unscrew the sensor counterclockwise (pay attention to prevent heat).
Cleaning: Throttle cleaner spray, acidic cleaners are prohibited.
Check harness plugs during installation to avoid oxidation.

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).

4. Mitsubishi Lancer O2 sensor

Original part numbers and OE NO.
Upstream(Front)Oxygen Sensor part No.（Bank 1 Sensor 1）：
OE number: MD365014 (for models 2008-2017)
OE No.: Bosch 18074 (compatible with NTK 25198)
Downstream(Rear) Oxygen Sensor part No. (Bank 1 Sensor 2):
OE No.: MD365015 (for 2008-2017 models)
OE No.: Bosch 17187 (compatible with Denso 234-9008)

Defender Oxygen Sensor Fault Codes&Symptom Signs
P0138: Front oxygen sensor signal high (injector leak)
P0152: Rear Oxygen Sensor Signal High (Poor Sensor Grounding)
P0172: mixture too rich (fuel pressure regulator malfunction)

How to remove and how to clean？
Remove Tool:22mm Oxygen Sensor Wrench (with magnetic attachment)
Remove Steps:Disconnect the battery, remove the engine compartment cover and locate the front oxygen sensor (located in the exhaust manifold).
Spray penetrating oil to loosen the threads and unscrew the sensor.
Cleaning: Electronic component cleaner, ensure complete drying before installation.
Check harness plugs during installation to avoid oxidation.

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: $80-$120 (compact cars have less room to maneuver, but lower hours).

5. Mitsubishi Montero Sport O2 sensor

Original part numbers and OE NO.
Upstream(Front)Oxygen Sensor part No.（Bank 1 Sensor 1）：
OE No.: MD365014 (for models 2008-2023)
OE No.: Bosch 18074 (compatible with NTK 25198)
Downstream(Rear) Oxygen Sensor part No. (Bank 1 Sensor 2): OE No.: MD365015 (for 2008-2023 models)
OE No.: Bosch 17187 (compatible with Denso 234-9008)

Defender Oxygen Sensor Fault Codes&Symptom Signs
P0133：Slow response from front oxygen sensor (poor fuel quality)
P0155: Rear oxygen sensor heating fault (blown fuse)
P0171: mixture too lean (clogged air filter)

How to remove and how to clean？
Remove Tool:22mm Oxygen Sensor Sleeve (with extension)
Remove Steps:Lift the vehicle, remove the bottom shield and locate the rear oxygen sensor (located behind the three-way catalytic converter).
Disconnect the wiring harness and use the socket to unscrew the sensor counterclockwise.
Cleaning: Specialized carbon cleaner, avoid contact with chemical solvents.
When installing, make sure the sensor probe is oriented correctly to avoid interference with the exhaust pipe.

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).

6. Mitsubishi ASX O2 sensor

Original part numbers and OE NO.
Upstream(Front)Oxygen Sensor part No.（Bank 1 Sensor 1）：
OE No.: MD365014 (for models 2010-2023)
OE No.: Bosch 18074 (compatible with NTK 25198)
Downstream(Rear) Oxygen Sensor part No. (Bank 1 Sensor 2)
(Bank 1 Sensor 2): OE No.: MD365015 (for 2010-2023 models)
OE No.: Bosch 17187 (compatible with Denso 234-9008)

Defender Oxygen Sensor Fault Codes&Symptom Signs
P0134：No signal from front oxygen sensor (sensor power supply failure)
P0151: Low signal from rear oxygen sensor (poor sensor grounding)
P0172: mixture too rich (fuel pump malfunction)

How to remove and how to clean？
Remove Tool:22mmOxygen Sensor Sleeve (with Universal Joint)
Remove Steps:Remove the sump guard and locate the front oxygen sensor (located in the exhaust manifold).
Disconnect the wiring harness and use a wrench to unscrew the sensor (high temperature area may burn, need to loosen and tighten repeatedly).
Cleaning:Wipe with a soft cloth dipped in alcohol, no water washing is allowed.
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).

7. Mitsubishi Pajero O2 sensor

Original part numbers and OE NO.
Upstream(Front)Oxygen Sensor part No.（Bank 1 Sensor 1）：
Original: MD365014 (for models 2008-2021)
OE number: Bosch 18074 (compatible with NTK 25198)
Downstream(Rear) Oxygen Sensor part No.（Bank 1 Sensor 2）：
Original: MD365015 (for models 2008-2021)
OE number: Bosch 17187 (compatible with Denso 234-9008)

Defender Oxygen Sensor Fault Codes&Symptom Signs
P0136：Rear Oxygen Sensor Circuit Malfunction (frayed wiring harness)
P0140: No signal from rear oxygen sensor (ECU supply needs to be checked)
P0153: Slow response from rear oxygen sensor (clogged three-way catalytic converter)

How to remove and how to clean？
Remove Tool:22mm Oxygen Sensor Wrench (with Ratchet Function)
Remove Steps:Lift the vehicle, remove the bottom guard and disconnect the sensor harness.
Use a 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 $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. Mitsubishi Colt O2 sensor

Original part numbers and OE NO.
Upstream(Front)Oxygen Sensor part No.（Bank 1 Sensor 1）：
Original: MD365014 (for models 2012-2024)
OE number: Bosch 18074 (compatible with NTK 25198)
Downstream(Rear) Oxygen Sensor part No.（Bank 1 Sensor 2）：
Original: MD365015 (for models 2012-2024)
OE number: Bosch 17187 (compatible with Denso 234-9008)

Defender Oxygen Sensor Fault Codes&Symptom Signs
P0132：Front oxygen sensor signal high (injector leak)
P0152: Rear Oxygen Sensor Signal High (Poor Sensor Ground)
P0172: mixture too rich (fuel pressure regulator malfunction)

How to remove and how to clean？
Remove Tool:22mm Oxygen Sensor Wrench with Magnetic Attachment
Remove Steps:Remove the lower engine guard and disconnect the sensor harness.
Use a 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. Mitsubishi Eclipse O2 sensor

Original part numbers and OE NO.
Upstream(Front)Oxygen Sensor part No.（Bank 1 Sensor 1）：
OE No.: MD365014 (for 2008-2012 models)
OE number: Bosch 18074 (compatible with NTK 25198)
Downstream(Rear) Oxygen Sensor part No.（Bank 1 Sensor 2）：
Genuine: MD365015 (for models 2008-2012)
OE number: Bosch 17187 (compatible with Denso 234-9008)

Defender Oxygen Sensor Fault Codes&Symptom Signs
P0138：Front oxygen sensor signal high (injector leak)
P0152: Rear Oxygen Sensor Signal High (Poor Sensor Ground)
P0172: mixture too rich (fuel pressure regulator malfunction)

How to remove and how to clean？
Remove Tool:22mm Oxygen Sensor Wrench (with magnetic attachment)
Remove Steps:Disconnect the battery, remove the engine compartment cover and locate the front oxygen sensor (located in the exhaust manifold).
Spray penetrating oil to loosen the threads and unscrew the sensor.
Cleaning: Electronic component cleaner, ensure complete drying before installation.
Check harness plugs during installation to avoid oxidation.

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: $80-$120 (compact cars have less room to maneuver, but lower hours).

10. Mitsubishi Delica O2 sensor

Original part numbers and OE NO.
Upstream(Front)Oxygen Sensor part No.（Bank 1 Sensor 1）：
Original: MD365014 (for models 2012-2024)
OE number: Bosch 18074 (compatible with NTK 25198)
Downstream(Rear) Oxygen Sensor part No.（Bank 1 Sensor 2）：
Original: MD365015 (for models 2012-2024)
OE number: Bosch 17187 (compatible with Denso 234-9008)

Defender Oxygen Sensor Fault Codes&Symptom Signs
P0130：Front oxygen sensor circuit malfunction (frayed wiring harness)
P0135: Front oxygen sensor heating fault (blown fuse)
P0171: mixture too lean (faulty air flow meter)

How to remove and how to clean？
Remove Tool:22mm Oxygen Sensor Sleeve (Short Handle Design)
Remove Steps:Remove the bottom shield and disconnect the sensor harness.
Use a wrench to unscrew the sensor counterclockwise.
Cleaning: Electronic component cleaner, ensure complete drying.
Check sealing gaskets 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 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 a special diagnostic instrument for parameter calibration.
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