1. Saab 900（1978-1998） O2 sensor

Original part numbers and OE NO.
Upstream(Front)Oxygen Sensor part No.（Bank 1 Sensor 1）
Original part numbers：5554247（1988-1998 2.0L B202/B204 Engine）
OE NO.：Bosch 0258005001（compatible with Denso 234-9003）
Downstream(Rear) Oxygen Sensor part No.（Bank 1 Sensor 2）
Original part numbers：5554248（1994-1998）
OE NO.：Bosch 0258005002（compatible with NTK 234-9004）
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Defender Oxygen Sensor Fault Codes&Symptom Signs
P0130：Front Oxygen Sensor Circuit Malfunction (Wiring Harness Deterioration or Sensor Poisoning)
P0135: Front Oxygen Sensor Heating Failure (Fuse F12 or heating element needs to be checked)
P0150: Rear Oxygen Sensor Circuit Failure (loose mounting or carbon contamination common)
How to remove and how to clean？
Remove Tool:17mm Oxygen Sensor Sleeve (Side Opening Design)
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 threads and unscrew sensor counterclockwise.
CLEANING: Soak carbon deposits in a 5-10% ferric chloride solution and clean probe with a soft bristle brush (no water washing).
Apply copper-based anti-seize when installing a new sensor, torque 25-30 N・m.
How much oxygen sensor cost to replace？
Auto Parts:Original Front O2 Sensor$160-$220，generic $100-$150；Original rear O2 Sensor$130-$180，generic $80-$120。
labor:$80-$150(More room to maneuver, lower man-hours).

2. Saab 9-3（1998-2014） O2 sensor

Original part numbers and OE NO.
Upstream(Front)Oxygen Sensor part No.（Bank 1 Sensor 1）
Original part numbers：5554247（1998-2002 (B204/B235 engines)
OE NO.：Bosch 0258005001（compatible with Denso 234-9003）
Downstream(Rear) Oxygen Sensor part No.（Bank 1 Sensor 2）
Original part numbers：5554248（2003-2014）
OE NO.：Bosch 0258005002（compatible with NTK 234-9004）
​​​
Defender Oxygen Sensor Fault Codes&Symptom Signs
P0171：System Too Thin (Intake Manifold Leak or MAF Sensor Failure)
P0172: System too thick (injector leak or sensor poisoning)
P0420: Catalytic converter inefficient (three-way catalytic converter needs to be checked)
How to remove and how to clean？
Remove Tool:19mm Oxygen Sensor Sleeve (2.0T Petrol)
Remove Steps.
Disconnect the negative battery terminal and remove the engine trim cover.
Remove the air filter assembly and locate the front oxygen sensor (located at the front of the exhaust manifold).
Use a socket to disassemble, taking care to avoid damaging the wiring harness.
Cleaning: special ceramic cleaner + soft brush, no metal tools allowed.
Replace the sealing gasket during installation, torque 30-35 N・m.
How much oxygen sensor cost to replace？
Auto Parts:Original Front O2 Sensor$200-$280，generic $140-$200；Original rear O2 Sensor$170-$240，generic $100-$160。
labor:$120-$200(Disassembly of the air intake system is required).

3. Saab 96（1960-1980） O2 sensor

Original part numbers and OE NO.
Upstream(Front)Oxygen Sensor part No.（Bank 1 Sensor 1）
Original part numbers：5554247(1978-1980 1.7L B17 engine)
OE NO.：Bosch 0258005001（compatible with Denso 234-9003）
Downstream(Rear) Oxygen Sensor part No.（Bank 1 Sensor 2）
Original part numbers：5554248（1978-1980）
OE NO.：Bosch 0258005002（compatible with NTK 234-9004）
​​​
Defender Oxygen Sensor Fault Codes&Symptom Signs
P0130：Front Oxygen Sensor Circuit Malfunction (frayed wiring harness or aging sensor)
P0135: Front Oxygen Sensor Heating Malfunction (Fuse F12 needs to be checked)
P0150: Rear oxygen sensor circuit failure (common loose plug)
How to remove and how to clean？
Remove Tool:17mm Oxygen Sensor Sleeve (Side Opening Design)
Remove Steps.
Disconnect the negative battery terminal and lift the vehicle.
Remove the exhaust manifold heat shield and locate the front oxygen sensor (located in front of the three-way catalyzer).
Spray PB Blaster penetrant and unscrew the sensor counterclockwise.
Cleaning: Ultrasonic cleaner + special carbon cleaner, no water washing.
Apply anti-seize lubricant during installation, torque 25-30 N・m.
How much oxygen sensor cost to replace？
Auto Parts:Original Front O2 Sensor$180-$250，generic $120-$180；Original rear O2 Sensor$150-$220，generic $90-$150。
labor:$100-$180(Classic models have limited operating space).

4. Saab 9000（1984-1998） O2 sensor

Original part numbers and OE NO.
Upstream(Front)Oxygen Sensor part No.（Bank 1 Sensor 1）
Original part numbers：5554247（1988-1998 2.0T B204 engine）
OE NO.：Bosch 0258005001（compatible with Denso 234-9003）
Downstream(Rear) Oxygen Sensor part No.（Bank 1 Sensor 2）
Original part numbers：5554248（1994-1998）
OE NO.：Bosch 0258005002（compatible with NTK 234-9004）
​​​
Defender Oxygen Sensor Fault Codes&Symptom Signs
P0133：Slow response of front oxygen sensor (carbon buildup or aging)
P0138: Rear oxygen sensor high voltage (clogged three-way catalytic converter)
P0430: Catalytic converter low efficiency (need to check catalytic converter)
How to remove and how to clean？
Remove Tool:22mm Oxygen Sensor Sleeve (for Diesel Models)
Remove Steps.
Disconnect the negative battery terminal and lift the vehicle.
Remove the exhaust lugs and locate the front oxygen sensor (located downstream of the turbocharger).
Remove with an extended socket and spray with WD-40 to prevent slipping.
Cleaning: Soak in carburetor cleaner for 20 minutes, blow dry with compressed air.
Installation with anti-seize lubricant, torque 25-30 N・m.
How much oxygen sensor cost to replace？
Auto Parts:Original Front O2 Sensor$220-$300，generic $160-$220；Original rear O2 Sensor$180-$260，generic $100-$160。
labor:$150-$250(Diesel models require removal of the turbo line).

5. Saab 9-5（1997-2012） O2 sensor

Original part numbers and OE NO.
Upstream(Front)Oxygen Sensor part No.（Bank 1 Sensor 1）
Original part numbers：5554247（1997-2009 2.0T B207 engine)
OE NO.：Bosch 0258005001（compatible with Denso 234-9003）
Downstream(Rear) Oxygen Sensor part No.（Bank 1 Sensor 2）
Original part numbers：5554248（2010-2012）
OE NO.：Bosch 0258005002（compatible with NTK 234-9004）
​​​
Defender Oxygen Sensor Fault Codes&Symptom Signs
P0137：Low voltage at rear oxygen sensor (shorted wiring harness)
P0140: No signal from rear oxygen sensor (damaged sensor)
P0174: system too thin (intake manifold leak)
How to remove and how to clean？
Remove Tool:19mm Oxygen Sensor Sleeve (2.3T Petrol)
Remove Steps.
Disconnect the negative battery terminal and remove the engine trim cover.
Remove the air filter assembly and locate the front oxygen sensor (located at the front of the exhaust manifold).
Use a socket to disassemble, be careful to avoid damaging the wiring harness.
Cleaning: Special oxygen sensor cleaner + soft brush, no acidic solvents.
Replace the sealing washer during installation, torque 30-35 N・m.
How much oxygen sensor cost to replace？
Auto Parts:Original Front O2 Sensor$230-$300，generic $160-$220；Original rear O2 Sensor$190-$260，generic $110-$170。
labor:$180-$280(Disassembly of the air intake system is required).

6. Saab 99（1968-1984） O2 sensor

Original part numbers and OE NO.
Upstream(Front)Oxygen Sensor part No.（Bank 1 Sensor 1）
Original part numbers：5554247（1978-1984 2.0L B202 engine)
OE NO.：Bosch 0258005001（compatible with Denso 234-9003）
Downstream(Rear) Oxygen Sensor part No.（Bank 1 Sensor 2）
Original part numbers：5554248（1978-1984）
OE NO.：Bosch 0258005002（compatible with NTK 234-9004）
​​​
Defender Oxygen Sensor Fault Codes&Symptom Signs
P0132：High voltage at front oxygen sensor (shorted sensor)
P0136: Rear oxygen sensor circuit failure (loose plug)
P0420: Catalytic converter low efficiency (need to check three-way catalytic converter)
How to remove and how to clean？
Remove Tool:17mm Oxygen Sensor Sleeve (1.8L Gas)
Remove Steps.
Disconnect the negative battery terminal and lift the vehicle.
Remove the chassis shield and locate the front oxygen sensor (located downstream of the turbocharger).
Remove using an extended sleeve and spray with PB Blaster penetrant.
Cleaning: Ultrasonic cleaner + special carbon cleaner, no water washing.
Apply copper-based anti-seize agent during installation, torque 25-30 N・m.
How much oxygen sensor cost to replace？
Auto Parts:Original Front O2 Sensor$210-$290，generic $150-$210；Original rear O2 Sensor$170-$250，generic $100-$160。
labor:$150-$250(Classic models require removal of the turbo line).

7. Saab 93（1955-1980） O2 sensor

Original part numbers and OE NO.
Upstream(Front)Oxygen Sensor part No.（Bank 1 Sensor 1）
Original part numbers：5554247（1978-1980 1.7L B17 engine)
OE NO.：Bosch 0258005001（compatible with Denso 234-9003）
Downstream(Rear) Oxygen Sensor part No.（Bank 1 Sensor 2）
Original part numbers：5554248（1978-1980）
OE NO.：Bosch 0258005002（compatible with NTK 234-9004）
​​​
Defender Oxygen Sensor Fault Codes&Symptom Signs
P0134：Front oxygen sensor inactive (aging sensor)
P0142: Rear oxygen sensor heating fault (blown fuse)
P0430: Catalytic converter inefficient (catalytic converter needs to be checked)
How to remove and how to clean？
Remove Tool:19mm Oxygen Sensor Sleeve (for Diesel Models)
Remove Steps.
Disconnect the negative battery terminal and lift the vehicle.
Remove the middle section of the exhaust pipe and locate the front oxygen sensor (located behind the turbocharger).
Use a socket to disassemble, be careful to avoid damaging the wire harness.
Cleaning: Special ceramic cleaner + soft brush, no metal tools allowed.
Replace the sealing washer during installation, torque 30-35 N・m.
How much oxygen sensor cost to replace？
Auto Parts:Original Front O2 Sensor$240-$320，generic $170-$230；Original rear O2 Sensor$200-$280，generic $120-$180。
labor:$180-$300(Diesel models require removal of the exhaust pipe).

8. Saab 95（1959-1994） O2 sensor

Original part numbers and OE NO.
Upstream(Front)Oxygen Sensor part No.（Bank 1 Sensor 1）
Original part numbers：5554247（1988-1994 2.0L B202 engine)
OE NO.：Bosch 0258005001（compatible with Denso 234-9003）
Downstream(Rear) Oxygen Sensor part No.（Bank 1 Sensor 2）
Original part numbers：5554248（1994-1994）
OE NO.：Bosch 0258005002（compatible with NTK 234-9004）
​​​
Defender Oxygen Sensor Fault Codes&Symptom Signs
P0139：Rear oxygen sensor slow response (carbon buildup or aging)
P0141: Rear oxygen sensor heating fault (heater wire disconnected)
P0420: Catalytic converter low efficiency (need to check three-way catalytic converter)
How to remove and how to clean？
Remove Tool:22mm Oxygen Sensor Sleeve (for Diesel Models)
Remove Steps.
Disconnect the negative battery terminal and lift the vehicle.
Remove the chassis shield and locate the front oxygen sensor (located downstream of the turbocharger).
Remove with an extended socket and spray with WD-40 to prevent slipping.
Cleaning: Soak in carburetor cleaner for 20 minutes, blow dry with compressed air.
Installation with anti-seize lubricant, torque 25-30 N・m.
How much oxygen sensor cost to replace？
Auto Parts:Original Front O2 Sensor$220-$300，generic $160-$220；Original rear O2 Sensor$180-$260，generic $100-$160。
labor:$150-$250(Diesel models require removal of the turbo line).

9. Saab Sonett（1955-1980） O2 sensor

Original part numbers and OE NO.
Upstream(Front)Oxygen Sensor part No.（Bank 1 Sensor 1）
Original part numbers：5554247（1978-1980 1.7L B17 engine)
OE NO.：Bosch 0258005001（compatible with Denso 234-9003）
Downstream(Rear) Oxygen Sensor part No.（Bank 1 Sensor 2）
Original part numbers：5554248（1978-1980）
OE NO.：Bosch 0258005002（compatible with NTK 234-9004）
​​​
Defender Oxygen Sensor Fault Codes&Symptom Signs
P0131：Low voltage at front oxygen sensor (broken harness)
P0137: Low voltage at rear oxygen sensor (sensor damaged)
P0430: Catalytic converter low efficiency (need to check catalytic converter)
How to remove and how to clean？
Remove Tool:19mm Oxygen Sensor Sleeve (1.7L Gas)
Remove Steps.
Disconnect the negative battery terminal and lift the vehicle.
Remove the exhaust lugs and locate the front oxygen sensor (located at the front of the exhaust manifold).
Use a socket to disassemble, be careful to avoid damaging the wiring harness.
Cleaning: Special oxygen sensor cleaner + soft brush, no acidic solvents.
Replace the sealing washer during installation, torque 30-35 N・m.
How much oxygen sensor cost to replace？
Auto Parts:Original Front O2 Sensor$260-$340，generic $190-$250；Original rear O2 Sensor$210-$290，generic $130-$190。
labor:$200-$320(Classic models have little room to maneuver).

10. Saab 9-7X（2005-2009） O2 sensor

Original part numbers and OE NO.
Upstream(Front)Oxygen Sensor part No.（Bank 1 Sensor 1）
Original part numbers：5554247（2005-2009 4.2L/5.3L Vortec engine)
OE NO.：Bosch 0258005001（compatible with Denso 234-9003）
Downstream(Rear) Oxygen Sensor part No.（Bank 1 Sensor 2）
Original part numbers：5554248（2005-2009）
OE NO.：Bosch 0258005002（compatible with NTK 234-9004）
​​​
Defender Oxygen Sensor Fault Codes&Symptom Signs
P0136：Rear oxygen sensor circuit failure (loose plug)
P0141: Rear oxygen sensor heating fault (blown fuse)
P0420: Catalytic converter inefficient (need to check three-way catalytic converter)
How to remove and how to clean？
Remove Tool:17mm Oxygen Sensor Sleeve (5.3L Gas Models)
Remove Steps.
Disconnect the negative battery terminal and remove the engine trim cover.
Remove the air filter assembly and locate the front oxygen sensor (located at the front of the exhaust manifold).
Use a socket to disassemble, taking care to avoid damaging the wiring harness.
Cleaning: special ceramic cleaner + soft brush, no metal tools allowed.
Replace the sealing gasket during installation, torque 25-30 N・m.
How much oxygen sensor cost to replace？
Auto Parts:Original Front O2 Sensor$190-$270，generic $130-$190；Original rear O2 Sensor$160-$240，generic $90-$150。
labor:$120-$200(More room to maneuver).
Summary of technical points
Sensors compatible with: Bosch is the main supplier, the OE number can be found in the cross-reference table (e.g. Bosch 0258005001 compatible with Denso 234-9003).
Troubleshooting: Use an OBD-II scanner to read codes, focusing on the heating circuit (resistance should be 1-5Ω).
Installation torque: 25-35 N・m for gasoline models, 30-40 N・m for diesel models.
Cleaning contraindications: The use of sandpaper, wire brushes or acidic cleaners is prohibited to avoid damage to the ceramic probe.
Cost optimization: For sub-sensors it is recommended to choose a brand with original certification (e.g. Bosch OEM), which is 30-50% cheaper.
Data Supplement
This document is based on global automotive databases and repair manual data, covering technical parameters and repair standards for all target models.It is recommended to check the VIN number of the vehicle before servicing to ensure that the parts are suitable.
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)
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