How to Check and Replace the Oxygen Sensor on a Toyota Sienna?

On the 2007 and the later model, the air/fuel sensors are in the exhaust manifold while the oxygen sensors are down in the exhaust pipes. To do this, place the pins into the signal and the ground terminal without having to remove the electrical connector. Check the voltage signal on a voltmeter, always being wary of hot components, especially the exhausts. The oxygen sensor should first of all, give a steady voltage of 0.1 volts to 0.2 volts when the system is cold and secondly should give fluctuating voltage of 0.1 volts to 0.9 volts when the engine is hot. In the event that closed loop mode is not engaged, then switching is inevitable and replacement called for. Check oxygen sensor heater and to do it measure the resistance on the HT and B+ terminals and check for the battery voltage on the heater. If any of the tests show failure, it means, the sensor has to be replaced. For replacement, first unplug the negative terminal on the battery and if replacing the downstream sensor the passenger seat will be needed to be unbolted and the connector removed. Lift the vehicle if necessary for the replacement of upstream sensor, disconnect the sensor connector then undo the sensor with slotted screw at the exhaust manifold or pipe. Copper anti-seize grease must be applied onto threads before fixing the new or the reinstalled sensor and join the electrical connector, and then lower the vehicle and take a test drive to check the absence of any check engine light. Plug the air/fuel sensor connector: Start the engine and turn on ADM; connect the LED display to the printer After performing above test, check next test suggested for; Air/fuel sensor: For the heating element resistance remove the connector and measure between terminal B+ and HT. If the resistance is incorrect, replace the sensor can be prescribed depending on the circumstances. The method of replacement is similar to the oxygen sensor by which we ensure to apply anti-seize compound and properly connect the electrical connector then jack down the car and check whether there are any check engine codes.

Genuine Toyota Sienna Oxygen Sensor

Oxygen O2 Sensor

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45 Oxygen Sensors found

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Toyota Sienna Air Fuel Ratio Oxygen Sensor
Part Number: 89467-41030
$213.08 MSRP: $305.54
You Save: $92.46 (31%)
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Product Specifications
- Other Name: Sensor, Wide Range Air Fuel Ratio; Oxygen Sensor
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2000-2003 Toyota Sienna | CE, LE | 6 Cyl 3.0L | 1MZFE; MCL10L-GFSDKA, MCL10L-GFSDKK, MCL10L-GFSGKA, MCL10L-GFSGKK, MCL10L-PFSDKA, MCL10L-PFSDKK, MCL10L-PFSGKA, MCL10L-PFSGKK, MCL10L-SESDKA, MCL10L-SESDKK
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Toyota Sienna Air Fuel Ratio Oxygen Sensor
Part Number: 89467-08040
$199.04 MSRP: $285.41
You Save: $86.37 (31%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor Air Fuel Ratio; Oxygen Sensor, Sensor
- Manufacturer Note: RH
- Position: Passenger Side
- Replaces: 89467-08020
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2004-2010 Toyota Sienna | CE, LE, XLE | 6 Cyl 3.3L, 6 Cyl 3.5L | 2GRFE, 3MZFE; GSL20L-PFADKK, GSL20L-PFAEKA, GSL20L-PFAEKK, GSL20L-PFAQKA, GSL20L-PFAQKK, GSL20L-PRADKK, GSL20L-PRAEKA, GSL20L-PRAEKK, GSL20L-PRAQKA, GSL20L-PRAQKK, GSL23L-SBADKA, GSL23L-SBADKK, GSL25L-PFADKK, GSL25L-PFAEKA, GSL25L-PFAEKK, GSL25L-PFAQKA, GSL25L-PFAQKK, MCL20L-PFADKK, MCL20L-PFAEKA, MCL20L-PFAEKK, MCL20L-PFAQKA, MCL20L-PFAQKK, MCL20L-PRADKK, MCL20L-PRAEKA, MCL20L-PRAEKK, MCL20L-PRAQKA, MCL20L-PRAQKK, MCL23L-SBADKA, MCL23L-SBADKK, MCL25L-PFADKK, MCL25L-PFAEKA, MCL25L-PFAEKK, MCL25L-PFAQKA, MCL25L-PFAQKK
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Toyota Sienna Oxygen Sensor
Part Number: 89465-08030
$125.06 MSRP: $177.80
You Save: $52.74 (30%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor, Oxygen
- Manufacturer Note: RH
- Position: Passenger Side
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2004-2007 Toyota Sienna | CE, LE, XLE | 6 Cyl 3.3L, 6 Cyl 3.5L | 2GRFE, 3MZFE; GSL20L-PFADKK, GSL20L-PFAEKA, GSL20L-PFAEKK, GSL20L-PFAQKA, GSL20L-PFAQKK, GSL20L-PRADKK, GSL20L-PRAEKA, GSL20L-PRAEKK, GSL20L-PRAQKA, GSL20L-PRAQKK, GSL23L-SBADKA, GSL23L-SBADKK, GSL25L-PFADKK, GSL25L-PFAEKA, GSL25L-PFAEKK, GSL25L-PFAQKA, GSL25L-PFAQKK, MCL20L-PFADKK, MCL20L-PFAEKA, MCL20L-PFAEKK, MCL20L-PFAQKA, MCL20L-PFAQKK, MCL20L-PRADKK, MCL20L-PRAEKA, MCL20L-PRAEKK, MCL20L-PRAQKA, MCL20L-PRAQKK, MCL23L-SBADKA, MCL23L-SBADKK, MCL25L-PFADKK, MCL25L-PFAEKA, MCL25L-PFAEKK, MCL25L-PFAQKA, MCL25L-PFAQKK
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Toyota Sienna Air Fuel Ratio Oxygen Sensor
Part Number: 89467-41040
$211.22 MSRP: $302.88
You Save: $91.66 (31%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor, Wide Range Air Fuel Ratio; Oxygen Sensor
- Position: Driver Side
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2000-2003 Toyota Sienna | CE, LE | 6 Cyl 3.0L | 1MZFE; MCL10L-GFSDKA, MCL10L-GFSDKK, MCL10L-GFSGKA, MCL10L-GFSGKK, MCL10L-PFSDKA, MCL10L-PFSDKK, MCL10L-PFSGKA, MCL10L-PFSGKK, MCL10L-SESDKA, MCL10L-SESDKK
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Toyota Sienna Oxygen Sensor
Part Number: 89465-08060
$126.93 MSRP: $180.45
You Save: $53.52 (30%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor, Oxygen; Lower Oxygen Sensor
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2011-2015 Toyota Sienna | LE, SE, STD, XLE | 4 Cyl 2.7L, 6 Cyl 3.5L | 1ARFE, 2GRFE; ASL30L-PFTEKA, ASL30L-PRTEKA, GSL30L-PFTDKA, GSL30L-PFTEKA, GSL30L-PFTQKA, GSL30L-PRTEKA, GSL30L-PRTQKA, GSL30L-PRTSKA, GSL33L-SBTDKA, GSL35L-PFTDKA, GSL35L-PFTEKA, GSL35L-PFTQKA
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Toyota Sienna Oxygen Sensor No.2
Part Number: 89465-0E040
$164.37 MSRP: $233.68
You Save: $69.31 (30%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Sensor, Oxygen No.2; Lower Oxygen Sensor, Oxygen Sensor
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2011-2015 Toyota Sienna | LE, SE, STD, XLE | 4 Cyl 2.7L, 6 Cyl 3.5L | 1ARFE, 2GRFE; ASL30L-PFTEKA, ASL30L-PRTEKA, GSL30L-PFTDKA, GSL30L-PFTEKA, GSL30L-PFTQKA, GSL30L-PRTEKA, GSL30L-PRTQKA, GSL30L-PRTSKA, GSL33L-SBTDKA, GSL35L-PFTDKA, GSL35L-PFTEKA, GSL35L-PFTQKA
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Toyota Sienna Air Fuel Ratio Oxygen Sensor
Part Number: 89467-07030
$174.34 MSRP: $249.98
You Save: $75.64 (31%)
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Product Specifications
- Other Name: Sensor, Air Fuel Ratio; Oxygen Sensor, Sensor, Upper Oxygen Sensor
- Manufacturer Note: LH
- Position: Driver Side
- Replaces: 89467-33170
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2011-2012 Toyota Sienna | LE, SE, STD, XLE | 4 Cyl 2.7L, 6 Cyl 3.5L | 1ARFE, 2GRFE; ASL30L-PFTEKA, ASL30L-PRTEKA, GSL30L-PFTDKA, GSL30L-PFTEKA, GSL30L-PFTQKA, GSL30L-PRTEKA, GSL30L-PRTQKA, GSL30L-PRTSKA, GSL33L-SBTDKA, GSL35L-PFTDKA, GSL35L-PFTEKA, GSL35L-PFTQKA
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Toyota Sienna Air Fuel Ratio Oxygen Sensor
Part Number: 89467-0E040
$239.06 MSRP: $342.80
You Save: $103.74 (31%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Sensor, Air Fuel Ratio; Oxygen Sensor, Upper Oxygen Sensor
- Replaces: 89467-48130
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2011-2012 Toyota Sienna | LE, SE, STD, XLE | 4 Cyl 2.7L, 6 Cyl 3.5L | 1ARFE, 2GRFE; ASL30L-PFTEKA, ASL30L-PRTEKA, GSL30L-PFTDKA, GSL30L-PFTEKA, GSL30L-PFTQKA, GSL30L-PRTEKA, GSL30L-PRTQKA, GSL30L-PRTSKA, GSL33L-SBTDKA, GSL35L-PFTDKA, GSL35L-PFTEKA, GSL35L-PFTQKA
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Toyota Sienna Oxygen Sensor
Part Number: 89465-08160
$118.98 MSRP: $169.15
You Save: $50.17 (30%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Sensor, Oxygen
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2016-2020 Toyota Sienna | LE, SE, STD, XLE | 6 Cyl 3.5L | 2GRFE, 2GRFKS; GSL30L-PFTDKA, GSL30L-PFTEKA, GSL30L-PFTQKA, GSL30L-PFZDHA, GSL30L-PFZEHA, GSL30L-PFZQHA, GSL30L-PRTEKA, GSL30L-PRTQKA, GSL30L-PRTSKA, GSL30L-PRZEHA, GSL30L-PRZQHA, GSL30L-PRZSHA, GSL33L-SBTDKA, GSL33L-SBZDHA, GSL33L-SEZDHA, GSL35L-PFTEKA, GSL35L-PFTQKA, GSL35L-PFZEHA, GSL35L-PFZQHA, GSL35L-PFZSHA
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Toyota Sienna Oxygen Sensor
Part Number: 89465-08040
$151.27 MSRP: $215.06
You Save: $63.79 (30%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor, Oxygen
- Manufacturer Note: LH
- Position: Driver Side
- Replaced by: 89465-48170
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2004-2007 Toyota Sienna | CE, LE, XLE | 6 Cyl 3.3L, 6 Cyl 3.5L | 2GRFE, 3MZFE; GSL20L-PFADKK, GSL20L-PFAEKA, GSL20L-PFAEKK, GSL20L-PFAQKA, GSL20L-PFAQKK, GSL20L-PRADKK, GSL20L-PRAEKA, GSL20L-PRAEKK, GSL20L-PRAQKA, GSL20L-PRAQKK, GSL23L-SBADKA, GSL23L-SBADKK, GSL25L-PFADKK, GSL25L-PFAEKA, GSL25L-PFAEKK, GSL25L-PFAQKA, GSL25L-PFAQKK, MCL20L-PFADKK, MCL20L-PFAEKA, MCL20L-PFAEKK, MCL20L-PFAQKA, MCL20L-PFAQKK, MCL20L-PRADKK, MCL20L-PRAEKA, MCL20L-PRAEKK, MCL20L-PRAQKA, MCL20L-PRAQKK, MCL23L-SBADKA, MCL23L-SBADKK, MCL25L-PFADKK, MCL25L-PFAEKA, MCL25L-PFAEKK, MCL25L-PFAQKA, MCL25L-PFAQKK
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Toyota Sienna Oxygen Sensor
Part Number: 89465-09290
$112.80 MSRP: $159.00
You Save: $46.20 (30%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor, Oxygen
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2000-2003 Toyota Sienna | CE, LE | 6 Cyl 3.0L | 1MZFE; MCL10L-GFSDKA, MCL10L-GFSDKK, MCL10L-GFSGKA, MCL10L-GFSGKK, MCL10L-PFSDKA, MCL10L-PFSDKK, MCL10L-PFSGKA, MCL10L-PFSGKK, MCL10L-SESDKA, MCL10L-SESDKK
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Toyota Sienna Air Fuel Ratio Oxygen Sensor
Part Number: 89467-06130
$208.90 MSRP: $299.56
You Save: $90.66 (31%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Sensor, Air Fuel Ratio
- Manufacturer Note: LH
- Position: Driver Side
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2011-2015 Toyota Sienna | LE, SE, STD, XLE | 4 Cyl 2.7L, 6 Cyl 3.5L | 1ARFE, 2GRFE; ASL30L-PFTEKA, ASL30L-PRTEKA, GSL30L-PFTDKA, GSL30L-PFTEKA, GSL30L-PFTQKA, GSL30L-PRTEKA, GSL30L-PRTQKA, GSL30L-PRTSKA, GSL33L-SBTDKA, GSL35L-PFTDKA, GSL35L-PFTEKA, GSL35L-PFTQKA
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Toyota Sienna Air Fuel Ratio Oxygen Sensor
Part Number: 89467-41011
$211.22 MSRP: $302.88
You Save: $91.66 (31%)
Ships in 1 Business Day
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Product Specifications
- Other Name: Sensor, Air Fuel Ratio; Oxygen Sensor
- Replaces: 89467-41010
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 1998-2001 Toyota Sienna | CE, LE | 6 Cyl 3.0L | 1MZFE; MCL10L-GFSDKA, MCL10L-GFSDKK, MCL10L-GFSGKA, MCL10L-GFSGKK, MCL10L-PFSDKA, MCL10L-PFSDKK, MCL10L-PFSGKA, MCL10L-PFSGKK, MCL10L-SESDKA, MCL10L-SESDKK
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Toyota Sienna Air Fuel Ratio Oxygen Sensor
Part Number: 89467-41021
$211.22 MSRP: $302.88
You Save: $91.66 (31%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor, Air Fuel Ratio; Oxygen Sensor
- Replaces: 89467-41020
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 1998-2001 Toyota Sienna | CE, LE | 6 Cyl 3.0L | 1MZFE; MCL10L-GFSDKA, MCL10L-GFSDKK, MCL10L-GFSGKA, MCL10L-GFSGKK, MCL10L-PFSDKA, MCL10L-PFSDKK, MCL10L-PFSGKA, MCL10L-PFSGKK, MCL10L-SESDKA, MCL10L-SESDKK
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Toyota Sienna Air Fuel Ratio Oxygen Sensor
Part Number: 89467-0E140
$233.73 MSRP: $335.15
You Save: $101.42 (31%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Air Fuel Ratio
- Replaces: 89467-48210
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2011-2015 Toyota Sienna | LE, SE, STD, XLE | 4 Cyl 2.7L, 6 Cyl 3.5L | 1ARFE, 2GRFE; ASL30L-PFTEKA, ASL30L-PRTEKA, GSL30L-PFTDKA, GSL30L-PFTEKA, GSL30L-PFTQKA, GSL30L-PRTEKA, GSL30L-PRTQKA, GSL30L-PRTSKA, GSL33L-SBTDKA, GSL35L-PFTDKA, GSL35L-PFTEKA, GSL35L-PFTQKA
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Toyota Sienna Oxygen Sensor No.2
Part Number: 89465-0E210
$160.75 MSRP: $228.53
You Save: $67.78 (30%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Sensor, Oxygen No.2
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2016-2020 Toyota Sienna | LE, SE, STD, XLE | 6 Cyl 3.5L | 2GRFE, 2GRFKS; GSL30L-PFTDKA, GSL30L-PFTEKA, GSL30L-PFTQKA, GSL30L-PFZDHA, GSL30L-PFZEHA, GSL30L-PFZQHA, GSL30L-PRTEKA, GSL30L-PRTQKA, GSL30L-PRTSKA, GSL30L-PRZEHA, GSL30L-PRZQHA, GSL30L-PRZSHA, GSL33L-SBTDKA, GSL33L-SBZDHA, GSL33L-SEZDHA, GSL35L-PFTEKA, GSL35L-PFTQKA, GSL35L-PFZEHA, GSL35L-PFZQHA, GSL35L-PFZSHA
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Toyota Sienna Air Fuel Ratio Oxygen Sensor, No.2
Part Number: 89467-0E240
$200.67 MSRP: $287.74
You Save: $87.07 (31%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor, Air Fuel Ratio, No.2
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2016-2020 Toyota Sienna | LE, SE, STD, XLE | 6 Cyl 3.5L | 2GRFE, 2GRFKS; GSL30L-PFTDKA, GSL30L-PFTEKA, GSL30L-PFTQKA, GSL30L-PFZDHA, GSL30L-PFZEHA, GSL30L-PFZQHA, GSL30L-PRTEKA, GSL30L-PRTQKA, GSL30L-PRTSKA, GSL30L-PRZEHA, GSL30L-PRZQHA, GSL30L-PRZSHA, GSL33L-SBTDKA, GSL33L-SBZDHA, GSL33L-SEZDHA, GSL35L-PFTEKA, GSL35L-PFTQKA, GSL35L-PFZEHA, GSL35L-PFZQHA, GSL35L-PFZSHA
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Toyota Sienna Air Fuel Ratio Oxygen Sensor
Part Number: 89467-0R100
$169.87 MSRP: $241.51
You Save: $71.64 (30%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor Air Fuel Rat
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2021-2024 Toyota Sienna | 4 Cyl 2.5L | A25AFXS; AXLH40L-PNXLHA, AXLH40L-PNXSHA, AXLH40L-PNXXHA, AXLH40L-PPXEHA, AXLH40L-PPXXHA, AXLH45L-PNXLHA, AXLH45L-PNXSHA, AXLH45L-PNXXHA, AXLH45L-PPXEHA
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Toyota Sienna Air Fuel Ratio Oxygen Sensor
Part Number: 89467-0E200
$181.76 MSRP: $260.63
You Save: $78.87 (31%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Sensor, Air Fuel Ratio
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2014-2017 Toyota Sienna | LE, SE, STD, XLE | 4 Cyl 2.7L, 6 Cyl 3.5L | 1ARFE, 2GRFE, 2GRFKS; ASL30L-PFTEKA, ASL30L-PRTEKA, GSL30L-PFTDKA, GSL30L-PFTEKA, GSL30L-PFTQKA, GSL30L-PFZDHA, GSL30L-PFZEHA, GSL30L-PFZQHA, GSL30L-PRTEKA, GSL30L-PRTQKA, GSL30L-PRTSKA, GSL30L-PRZEHA, GSL30L-PRZQHA, GSL30L-PRZSHA, GSL33L-SBTDKA, GSL33L-SBZDHA, GSL33L-SEZDHA, GSL35L-PFTDKA, GSL35L-PFTEKA, GSL35L-PFTQKA, GSL35L-PFZEHA, GSL35L-PFZQHA
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Toyota Sienna Air Fuel Ratio Oxygen Sensor
Part Number: 89467-0E250
$200.67 MSRP: $287.74
You Save: $87.07 (31%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Air Fuel Ratio
- Manufacturer Note: RH BANK
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2016-2020 Toyota Sienna | LE, SE, STD, XLE | 6 Cyl 3.5L | 2GRFE, 2GRFKS; GSL30L-PFTDKA, GSL30L-PFTEKA, GSL30L-PFTQKA, GSL30L-PFZDHA, GSL30L-PFZEHA, GSL30L-PFZQHA, GSL30L-PRTEKA, GSL30L-PRTQKA, GSL30L-PRTSKA, GSL30L-PRZEHA, GSL30L-PRZQHA, GSL30L-PRZSHA, GSL33L-SBTDKA, GSL33L-SBZDHA, GSL33L-SEZDHA, GSL35L-PFTEKA, GSL35L-PFTQKA, GSL35L-PFZEHA, GSL35L-PFZQHA, GSL35L-PFZSHA

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Toyota Sienna Oxygen Sensor

If you are in demand for superior quality and affordable OEM Toyota Sienna Oxygen Sensor, then shop with us! We own a wide range of the reduced-priced genuine Toyota Sienna Oxygen Sensor. You can purchase in confidence as all parts come with a manufacturer's warranty. Any issues with our products? No need to worry as we have a hassle-free return policy to guide you every step of the way.

Toyota Sienna Oxygen Sensor Parts Questions & Experts Answers

Air Fuel Ratio Oxygen Sensor
89467-41020
Q: How to Check and Replace the Oxygen Sensor on a Toyota Sienna?
A:
On the 2007 and the later model, the air/fuel sensors are in the exhaust manifold while the oxygen sensors are down in the exhaust pipes. To do this, place the pins into the signal and the ground terminal without having to remove the electrical connector. Check the voltage signal on a voltmeter, always being wary of hot components, especially the exhausts. The oxygen sensor should first of all, give a steady voltage of 0.1 volts to 0.2 volts when the system is cold and secondly should give fluctuating voltage of 0.1 volts to 0.9 volts when the engine is hot. In the event that closed loop mode is not engaged, then switching is inevitable and replacement called for. Check oxygen sensor heater and to do it measure the resistance on the HT and B+ terminals and check for the battery voltage on the heater. If any of the tests show failure, it means, the sensor has to be replaced. For replacement, first unplug the negative terminal on the battery and if replacing the downstream sensor the passenger seat will be needed to be unbolted and the connector removed. Lift the vehicle if necessary for the replacement of upstream sensor, disconnect the sensor connector then undo the sensor with slotted screw at the exhaust manifold or pipe. Copper anti-seize grease must be applied onto threads before fixing the new or the reinstalled sensor and join the electrical connector, and then lower the vehicle and take a test drive to check the absence of any check engine light. Plug the air/fuel sensor connector: Start the engine and turn on ADM; connect the LED display to the printer After performing above test, check next test suggested for; Air/fuel sensor: For the heating element resistance remove the connector and measure between terminal B+ and HT. If the resistance is incorrect, replace the sensor can be prescribed depending on the circumstances. The method of replacement is similar to the oxygen sensor by which we ensure to apply anti-seize compound and properly connect the electrical connector then jack down the car and check whether there are any check engine codes.