1. Saturn Vue(2002-2010) O2 sensor

Original part numbers and OE NO.
Upstream(Front) Oxygen Sensor part No.:(Bank 1 Sensor 1)
Original part numbers:12580827(2006-2007 2.2L/2.4L)
OE NO.:Bosch 15912(compatible with NTK 21045)
Original part numbers:12594452(2008-2010 3.5L/3.6L)
OE NO.:Denso 234-4357(compatible with AC Delco 1255-8143)
Downstream(Rear) Oxygen Sensor part No.:(Bank 1 Sensor 2)
Original part numbers:12608693(2008-2010 3.5L)
OE NO.:Bosch 15897(compatible with NTK 24255)
Original part numbers:12618010(2010 2.4L/3.6L)
OE NO.:Denso 234-4401(compatible with AC Delco 12578576)
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Defender Oxygen Sensor Fault Codes&Symptom Signs
P0130 Front O2 Sensor Circuit Disconnected (worn harness or oxidized connector) Check harness continuity, replace sensor or connector
P0135 Front O2 Sensor Heating Failure (heater wire blown) Measure heater wire resistance (normal 4-5Ω), replace sensor.
P0150 Rear O2 Sensor signal abnormality (carbon contamination or poisoning) Clean sensor or replace (soak in ferric chloride solution).
How to remove and how to clean？
Remove Tool:22mm Oxygen Sensor Sleeve (with notched design), WD-40, anti-seize lubricant.
Remove Steps.
Disconnect the negative battery terminal and lift the vehicle to a safe height.
Remove exhaust manifold heat shield and locate Front (front of three-way catalyzer).
Spray WD-40 to loosen threads and unscrew sensor counterclockwise.
O2 Sensor clean: Soak sensor head in 5% ferric chloride solution for 10 minutes, clean probe with soft bristle brush, no water washing.
When installing a new sensor, apply anti-seize agent and torque to 30-40 N・m.
How much oxygen sensor cost to replace？

2. Saturn Ion(2003-2007) O2 sensor

Original part numbers and OE NO.
Upstream(Front) Oxygen Sensor part No.:(Bank 1 Sensor 1)
Original part numbers:12579542(2.2L/2.4L)
OE NO.:Bosch 13256(compatible with AC Delco 1255-8143)
Downstream(Rear) Oxygen Sensor part No.:(Bank 1 Sensor 2)
Original part numbers:12601759(2.2L/2.4L)
OE NO.:Denso 234-4357(compatible with NTK 24259)
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Defender Oxygen Sensor Fault Codes&Symptom Signs
P0134 Front O2 sensor signal drift (long term use of poor quality fuel) Clean sensor or replace, check fuel quality
P0141 Rear O2 sensor Heater failure (blown fuse) Check fuse F22 (10A), replace sensor.
P0171 Mixture too lean (Front O2 sensor false alarm) Check for air intake leaks or insufficient fuel pump pressure.
How to remove and how to clean？
Remove Tool:17mm Open end wrench, socket extension.
Remove Steps.
Disconnect the negative battery terminal and remove the air filter assembly.
Disconnect the wiring harness plug from the Front O2 sensor (right side of exhaust manifold).
Use a wrench to unscrew the sensor counterclockwise, taking care to avoid damaging the threads.
O2 Sensor clean:Spray the probe with carburetor cleaner, avoiding contact with the electronics.
How much oxygen sensor cost to replace？

3. Saturn Aura(2007-2009) O2 sensor

Original part numbers and OE NO.
Upstream(Front) Oxygen Sensor part No.:(Bank 1 Sensor 1)
Original part numbers:12594935(3.5L/3.6L)
OE NO.:Bosch 15401(compatible with AC Delco 1255-8143)
Downstream(Rear) Oxygen Sensor part No.:(Bank 1 Sensor 2)
Original part numbers:12601760(3.5L/3.6L)
OE NO.:Denso 234-4401(compatible with NTK 24255)
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Defender Oxygen Sensor Fault Codes&Symptom Signs

P0136 Rear O2 sensor signal invalid (three-way catalytic converter clogged) Check catalytic converter back pressure, replace if necessary
P0155 Rear O2 sensor heating circuit shorted (wiring harness lap) Repair wiring harness insulation, replace sensor
P0420 Three-way catalytic converter inefficient (small difference in front/rear oxygen signals) Replace catalytic converter or check oxygen sensor synchronization

How to remove and how to clean？
Remove Tool:22mm Oxygen sensor socket, torque wrench.
Remove Steps.
Disconnect the negative battery terminal and remove the engine guard.
Locate the Rear O2 sensor (rear end of the three-way catalyzer) and disconnect the wiring harness plug.
Unscrew the sensor counterclockwise with the socket, paying attention to high temperature residues.
O2 Sensor clean: Use ultrasonic cleaner (temperature 40℃, time 5 minutes), dry and test.
How much oxygen sensor cost to replace？

4. Saturn Outlook(2007-2010) O2 sensor

Original part numbers and OE NO.
Upstream(Front) Oxygen Sensor part No.:(Bank 1 Sensor 1)
Original part numbers:12594452(3.5L/3.6L)
OE NO.:Bosch 15401(compatible with AC Delco 1255-8143)
Downstream(Rear) Oxygen Sensor part No.:(Bank 1 Sensor 2)
Original part numbers:12608693(3.5L/3.6L)
OE NO.:Denso 234-4401(compatible with NTK 24255)
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Defender Oxygen Sensor Fault Codes&Symptom Signs
P0137 Rear O2 sensor voltage too low (sensor deterioration) Replace sensor, check ground wire
P0140 Rear O2 sensor signal does not change (carbon buildup on probe) Clean or replace sensor, check exhaust system
P0430 Three-way catalytic converter low efficiency (abnormal rear oxygen signal) Replace catalytic converter or check Front O2 Sensor
How to remove and how to clean？
Remove Tool:22mm Oxygen sensor socket, universal joint wrench.
Remove Steps.
Disconnect the negative battery terminal and lift the vehicle to a high position.
Remove the three-way catalytic converter heat shield and locate the Rear O2 sensor.
Unscrew the sensor counterclockwise after spraying the loosener, noting where the harness goes.
O2 Sensor clean:Use special oxygen sensor cleaner (e.g. CRC 05103) and avoid contact with the heating element.
How much oxygen sensor cost to replace？
Auto Parts Original generic labor
Front $140-$200 $80-$120 $100-$140
Rear $110-$170 $50-$90 $70-$110
Supplementary data notes
For more detailed repair manuals or year-specific data, it is recommended to obtain them through your dealer or a specialized repair platform.
Part Number Fitment:Some part numbers may be slightly adjusted due to the differences in engines model and year, it is recommended to check the specific fitment 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 channel differences, real-time data suggest checking local dealers)
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