How do you replace an oxygen sensor on Toyota Rav4?

Because the oxygen sensor is installed in the exhaust manifold or pipe, which contracts when cool, it may be very difficult to loosen when the engine is cold. To avoid damaging the sensor, especially if planning to reuse it, start and run the engine for a minute or two before shutting it off, taking care not to burn yourself during the procedure. The upstream sensor, located before the catalytic converter, is also known as the Air/Fuel Ratio Sensor (Bank 1, Sensor 1), while the downstream sensor, located after the catalytic converter, is referred to as the Heated Oxygen Sensor (Bank 1, Sensor 2). Begin by disconnecting the cable from the negative battery terminal. The upstream sensor can be replaced without raising the vehicle; locate it in the engine compartment, unplug the electrical connector, and unclip any interfering coolant hoses as necessary. Use a special oxygen sensor socket to unscrew the sensor. For the downstream sensor, raise the vehicle and support it on jackstands, then access the oxygen sensor harness and unplug the electrical connector. If there is insufficient space to unscrew the downstream sensor, the relevant section of the exhaust pipe may need to be removed, and applying penetrating lubricant to the bolts/threads can assist in their removal. The best tool for this task is a special slotted socket, particularly if the sensor is to be reused, so take care not to round off the hex fitting. Unscrew the sensor from the exhaust manifold or pipe, then apply anti-seize compound to the threads of the sensor to facilitate future removal. New sensors typically come pre-coated, but if reusing an old sensor, recoat the threads before installation and ensure it is tightened securely. For the downstream sensor, reinstall the exhaust pipe section and tighten the fasteners. Finally, reconnect the electrical connector of the pigtail lead to the main wiring harness, attach any necessary connector retaining clips, lower the vehicle if it was raised, and test drive to verify that no trouble codes have been set.

Genuine Toyota RAV4 Oxygen Sensor

Oxygen O2 Sensor

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38 Oxygen Sensors found

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Toyota RAV4 Oxygen Sensor
Part Number: 89465-42200
$109.21 MSRP: $153.99
You Save: $44.78 (30%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor, Oxygen; Rear Oxygen Sensor
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2008-2012 Toyota RAV4 | Limited, Sport, X | 4 Cyl 2.5L | 2ARFE; 2ARFE; ASA33L-ANPGKA, ASA33L-ANPGKK, ASA33L-ANPSKA, ASA33L-ANPSKK, ASA33L-ANPXKA, ASA33L-ANPXKK, ASA38L-ANPGKA, ASA38L-ANPSKA, ASA38L-ANPXKA
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Toyota RAV4 Air Fuel Ratio Oxygen Sensor
Part Number: 89467-06250
$172.56 MSRP: $245.32
You Save: $72.76 (30%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Sensor, Air Fuel Rat
- Manufacturer Note: FR
- Position: Front
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2019-2022 Toyota RAV4 | 4 Cyl 2.5L | A25AFKS, A25AFXS; A25AFKS, A25AFXS; AXAA52L-CNZGBA, AXAA52L-CNZMBA, AXAA52L-CNZMBK, AXAA52L-CNZXBA, AXAA52L-CNZXBK, AXAA54L-CNZGBA, AXAA54L-CNZGBK, AXAA54L-CNZMBA, AXAA54L-CNZMBK, AXAA54L-CNZVBA, AXAA54L-CNZVBK, AXAA54L-CNZXBA, AXAA54L-CNZXBK, AXAH54L-CNXGBA, AXAH54L-CNXGBK, AXAH54L-CNXMBA, AXAH54L-CNXMBK, AXAH54L-CNXXBA, AXAH54L-CNXXBK, AXAL54L-CNXGBA, AXAL54L-CNXMBA, AXAL54L-CNXXBA
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Toyota RAV4 Oxygen Sensor
Part Number: 89465-0R040
$109.04 MSRP: $153.99
You Save: $44.95 (30%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor, Oxygen; Rear Oxygen Sensor
- Replaces: 89465-42230
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2013-2018 Toyota RAV4 | LE, Limited, SE, XLE | 4 Cyl 2.5L | 2ARFE, 2ARFXE; 2ARFE, 2ARFE; ASA42L-CNTGKA, 2ARFXE; ASA42L-ANTGKA, ASA42L-ANTMKA, ASA42L-ANTSKA, ASA42L-ANTXKA, ASA42L-CNTGKK, ASA42L-CNTMKA, ASA42L-CNTMKK, ASA42L-CNTSKA, ASA42L-CNTSKK, ASA42L-CNTXKA, ASA42L-CNTXKK, ASA44L-ANTGKA, ASA44L-ANTMKA, ASA44L-ANTSKA, ASA44L-ANTXKA, ASA44L-CNTGKA, ASA44L-CNTGKK, ASA44L-CNTMKA, ASA44L-CNTMKK, ASA44L-CNTSKA, ASA44L-CNTSKK, ASA44L-CNTXKA, ASA44L-CNTXKK, AVA44L-ANXGBA, AVA44L-ANXGBK, AVA44L-ANXMBA, AVA44L-ANXMBK, AVA44L-ANXSBA, AVA44L-ANXSBK
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Toyota RAV4 Oxygen Sensor
Part Number: 89465-0R010
$109.04 MSRP: $153.99
You Save: $44.95 (30%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor, Oxygen
- Replaced by: 89465-0R080
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2009-2012 Toyota RAV4 | Limited, Sport, STD | 4 Cyl 2.5L | 2ARFE; 2ARFE; ASA33L-CNPGKA, ASA33L-CNPGKK, ASA33L-CNPSKA, ASA33L-CNPSKK, ASA33L-CNPXKA, ASA33L-CNPXKK, ASA38L-CNPGKA, ASA38L-CNPGKK, ASA38L-CNPSKA, ASA38L-CNPSKK, ASA38L-CNPXKA, ASA38L-CNPXKK
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Toyota RAV4 Air Fuel Ratio Oxygen Sensor
Part Number: 89467-28010
$159.81 MSRP: $227.19
You Save: $67.38 (30%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor, Air Fuel Ratio
- Manufacturer Note: MARK 89467-28010
- Replaced by: 89467-72010
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2006-2009 Toyota RAV4 | Limited, Sport, X | 4 Cyl 2.4L | 2AZFE; 2AZFE; ACA33L-ANPGKA, ACA33L-ANPGKK, ACA33L-ANPSKA, ACA33L-ANPSKK, ACA33L-ANPXKA, ACA33L-ANPXKK, ACA38L-ANPGKA, ACA38L-ANPSKA, ACA38L-ANPXKA
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Toyota RAV4 Air Fuel Ratio Oxygen Sensor
Part Number: 89467-0R050
$186.28 MSRP: $267.11
You Save: $80.83 (31%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor, Air Fuel Ratio; Front Oxygen Sensor, Oxygen Sensor
- Manufacturer Note: (L)
- Replaces: 89467-21020, 89467-0R060
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2013-2018 Toyota RAV4 | LE, Limited, SE, XLE | 4 Cyl 2.5L | 2ARFE; 2ARFE; ASA42L-ANTGKA, 2ARFE; ASA42L-CNTGKA, ASA42L-ANTMKA, ASA42L-ANTSKA, ASA42L-ANTXKA, ASA42L-CNTGKA, ASA42L-CNTGKK, ASA42L-CNTMKA, ASA42L-CNTMKK, ASA42L-CNTSKA, ASA42L-CNTSKK, ASA42L-CNTXKA, ASA42L-CNTXKK, ASA44L-ANTGKA, ASA44L-ANTMKA, ASA44L-ANTSKA, ASA44L-ANTXKA, ASA44L-CNTGKA, ASA44L-CNTGKK, ASA44L-CNTMKA, ASA44L-CNTMKK, ASA44L-CNTSKA, ASA44L-CNTSKK, ASA44L-CNTXKA, ASA44L-CNTXKK
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Toyota RAV4 Air Fuel Ratio Oxygen Sensor
Part Number: 89467-21020
$186.28 MSRP: $267.11
You Save: $80.83 (31%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Air Fuel Ratio
- Replaced by: 89467-0R050
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2013-2018 Toyota RAV4 | LE, Limited, SE, XLE | 4 Cyl 2.5L | 2ARFE; 2ARFE; ASA42L-ANTGKA, ASA42L-ANTMKA, ASA42L-ANTSKA, ASA42L-ANTXKA, ASA42L-CNTGKA, ASA42L-CNTGKK, ASA42L-CNTMKA, ASA42L-CNTMKK, ASA42L-CNTSKA, ASA42L-CNTSKK, ASA42L-CNTXKA, ASA42L-CNTXKK, ASA44L-ANTGKA, ASA44L-ANTMKA, ASA44L-ANTSKA, ASA44L-ANTXKA, ASA44L-CNTGKA, ASA44L-CNTGKK, ASA44L-CNTMKA, ASA44L-CNTMKK, ASA44L-CNTSKA, ASA44L-CNTSKK, ASA44L-CNTXKA, ASA44L-CNTXKK
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Toyota RAV4 Air Fuel Ratio Oxygen Sensor
Part Number: 89467-42020
$221.66 MSRP: $317.85
You Save: $96.19 (31%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Sensor, Air Fuel Ratio; Oxygen Sensor, Sensor
- Manufacturer Note: RH
- Position: Passenger Side
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2001-2004 Toyota RAV4 | 4 Cyl 2.0L, 4 Cyl 2.4L | 1AZFE, 2AZFE; 1AZFE, 2AZFE; ACA21L-AWMNKA, ACA21L-AWMNKK, ACA21L-AWPNKA, ACA21L-AWPNKK, ACA23L-AWMNKA, ACA23L-AWMNKK, ACA23L-AWPNKA, ACA23L-AWPNKK, ACA26L-AWMNKA, ACA26L-AWPNKA, ACA28L-AWMNKA, ACA28L-AWPNKA
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Toyota RAV4 Air Fuel Ratio Oxygen Sensor
Part Number: 89467-42170
$159.81 MSRP: $227.19
You Save: $67.38 (30%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Air Fuel Rat
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2019-2022 Toyota RAV4 | 4 Cyl 2.5L | A25AFKS, A25AFXS; A25AFKS, A25AFXS; AXAA52L-ANZGBA, AXAA52L-ANZMBA, AXAA52L-ANZXBA, AXAA54L-ANZGBA, AXAA54L-ANZMBA, AXAA54L-ANZVBA, AXAA54L-ANZXBA, AXAH52L-ANXMBA, AXAH54L-ANXGBA, AXAH54L-ANXMBA, AXAH54L-ANXXBA, AXAL54L-ANXGBA, AXAL54L-ANXMBA, AXAL54L-ANXXBA
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Toyota RAV4 Air Fuel Ratio Oxygen Sensor
Part Number: 89467-42010
$197.07 MSRP: $282.58
You Save: $85.51 (31%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor, Air Fuel Ratio; Oxygen Sensor, Sensor
- Manufacturer Note: LH
- Position: Driver Side
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2001-2004 Toyota RAV4 | 4 Cyl 2.0L, 4 Cyl 2.4L | 1AZFE, 2AZFE; 1AZFE, 2AZFE; ACA21L-AWMNKA, ACA21L-AWMNKK, ACA21L-AWPNKA, ACA21L-AWPNKK, ACA23L-AWMNKA, ACA23L-AWMNKK, ACA23L-AWPNKA, ACA23L-AWPNKK, ACA26L-AWMNKA, ACA26L-AWPNKA, ACA28L-AWMNKA, ACA28L-AWPNKA
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Toyota RAV4 Oxygen Sensor
Part Number: 89465-42170
$109.21 MSRP: $153.99
You Save: $44.78 (30%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Oxygen; Rear Oxygen Sensor
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2006-2009 Toyota RAV4 | Limited, Sport, X | 4 Cyl 2.4L | 2AZFE; 2AZFE; ACA33L-ANPGKA, ACA33L-ANPGKK, ACA33L-ANPSKA, ACA33L-ANPSKK, ACA33L-ANPXKA, ACA33L-ANPXKK, ACA38L-ANPGKA, ACA38L-ANPSKA, ACA38L-ANPXKA
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Toyota RAV4 Oxygen Sensor
Part Number: 89465-0R030
$119.56 MSRP: $170.76
You Save: $51.20 (30%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Oxygen; Rear Oxygen Sensor
- Manufacturer Note: RH
- Position: Passenger Side
- Replaces: 89465-42160
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2006-2012 Toyota RAV4 | Limited, STD, Sport, X | 6 Cyl 3.5L | 2GRFE; 2GRFE; GSA33L-ANAGKA, 2GRFE; GSA33L-CNAGKA, GSA33L-ANAGKK, GSA33L-ANASKA, GSA33L-ANASKK, GSA33L-ANAXKA, GSA33L-ANAXKK, GSA33L-CNAGKK, GSA33L-CNASKA, GSA33L-CNASKK, GSA33L-CNAXKA, GSA33L-CNAXKK, GSA38L-ANAGKA, GSA38L-ANASKA, GSA38L-ANAXKA, GSA38L-CNAGKA, GSA38L-CNAGKK, GSA38L-CNASKA, GSA38L-CNASKK, GSA38L-CNAXKA, GSA38L-CNAXKK
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Toyota RAV4 Oxygen Sensor
Part Number: 89465-42090
$117.40 MSRP: $166.33
You Save: $48.93 (30%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Oxygen
- Manufacturer Note: LH
- Position: Driver Side
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2001-2004 Toyota RAV4 | 4 Cyl 2.0L, 4 Cyl 2.4L | 1AZFE, 2AZFE; 1AZFE, 2AZFE; ACA21L-AWMNKA, ACA21L-AWMNKK, ACA21L-AWPNKA, ACA21L-AWPNKK, ACA23L-AWMNKA, ACA23L-AWMNKK, ACA23L-AWPNKA, ACA23L-AWPNKK, ACA26L-AWMNKA, ACA26L-AWPNKA, ACA28L-AWMNKA, ACA28L-AWPNKA
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Toyota RAV4 Oxygen Sensor
Part Number: 89465-42160
$119.56 MSRP: $170.76
You Save: $51.20 (30%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Oxygen
- Manufacturer Note: RR RH
- Position: Rear Passenger Side
- Replaced by: 89465-0R030
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2006-2012 Toyota RAV4 | Limited, Sport, X | 6 Cyl 3.5L | 2GRFE; 2GRFE; GSA33L-ANAGKA, GSA33L-ANAGKK, GSA33L-ANASKA, GSA33L-ANASKK, GSA33L-ANAXKA, GSA33L-ANAXKK, GSA38L-ANAGKA, GSA38L-ANASKA, GSA38L-ANAXKA
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Toyota RAV4 Air Fuel Ratio Oxygen Sensor
Part Number: 89467-42120
$198.46 MSRP: $284.59
You Save: $86.13 (31%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Air Fuel Ratio; Front Oxygen Sensor, Oxygen Sensor
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2008-2012 Toyota RAV4 | Limited, Sport, STD, X | 4 Cyl 2.5L | 2ARFE; 2ARFE; ASA33L-ANPGKA, ASA33L-ANPGKK, ASA33L-ANPSKA, ASA33L-ANPSKK, ASA33L-ANPXKA, ASA33L-ANPXKK, ASA33L-CNPGKA, ASA33L-CNPGKK, ASA33L-CNPSKA, ASA33L-CNPSKK, ASA33L-CNPXKA, ASA33L-CNPXKK, ASA38L-ANPGKA, ASA38L-ANPSKA, ASA38L-ANPXKA, ASA38L-CNPGKA, ASA38L-CNPGKK, ASA38L-CNPSKA, ASA38L-CNPSKK, ASA38L-CNPXKA, ASA38L-CNPXKK
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Toyota RAV4 Oxygen Sensor
Part Number: 89465-42130
$107.01 MSRP: $150.99
You Save: $43.98 (30%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Oxygen
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2003-2005 Toyota RAV4 | 4 Cyl 2.0L, 4 Cyl 2.4L | 1AZFE, 2AZFE; 1AZFE, 2AZFE; ACA21L-AWMNKA, ACA21L-AWMNKK, ACA21L-AWPNKA, ACA21L-AWPNKK, ACA23L-AWMNKA, ACA23L-AWMNKK, ACA23L-AWPNKA, ACA23L-AWPNKK, ACA26L-AWMNKA, ACA26L-AWPNKA, ACA28L-AWMNKA, ACA28L-AWPNKA
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Toyota RAV4 Oxygen Sensor
Part Number: 89465-42150
$120.73 MSRP: $172.43
You Save: $51.70 (30%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Sensor, Oxygen
- Manufacturer Note: RR LH
- Position: Rear Driver Side
- Replaced by: 89465-0R020
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2006-2012 Toyota RAV4 | Limited, Sport, X | 6 Cyl 3.5L | 2GRFE; 2GRFE; GSA33L-ANAGKA, GSA33L-ANAGKK, GSA33L-ANASKA, GSA33L-ANASKK, GSA33L-ANAXKA, GSA33L-ANAXKK, GSA38L-ANAGKA, GSA38L-ANASKA, GSA38L-ANAXKA
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Toyota RAV4 Air Fuel Ratio Oxygen Sensor
Part Number: 89467-42040
$199.04 MSRP: $285.41
You Save: $86.37 (31%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Air Fuel Ratio; Oxygen Sensor, Sensor
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2003-2005 Toyota RAV4 | 4 Cyl 2.0L, 4 Cyl 2.4L | 1AZFE, 2AZFE; 1AZFE, 2AZFE; ACA21L-AWMNKA, ACA21L-AWMNKK, ACA21L-AWPNKA, ACA21L-AWPNKK, ACA23L-AWMNKA, ACA23L-AWMNKK, ACA23L-AWPNKA, ACA23L-AWPNKK, ACA26L-AWMNKA, ACA26L-AWPNKA, ACA28L-AWMNKA, ACA28L-AWPNKA
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Toyota RAV4 Air Fuel Ratio Oxygen Sensor
Part Number: 89467-0R100
$161.57 MSRP: $229.69
You Save: $68.12 (30%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor Air Fuel Rat
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2019-2022 Toyota RAV4 | 4 Cyl 2.5L | A25AFKS, A25AFXS; A25AFKS, A25AFXS; AXAA52L-CNZGBA, AXAA52L-CNZMBA, AXAA52L-CNZMBK, AXAA52L-CNZXBA, AXAA52L-CNZXBK, AXAA54L-CNZGBA, AXAA54L-CNZGBK, AXAA54L-CNZMBA, AXAA54L-CNZMBK, AXAA54L-CNZVBA, AXAA54L-CNZVBK, AXAA54L-CNZXBA, AXAA54L-CNZXBK, AXAH54L-CNXGBA, AXAH54L-CNXGBK, AXAH54L-CNXMBA, AXAH54L-CNXMBK, AXAH54L-CNXXBA, AXAH54L-CNXXBK, AXAL54L-CNXGBA, AXAL54L-CNXMBA, AXAL54L-CNXXBA
View related parts
Toyota RAV4 Air Fuel Ratio Oxygen Sensor
Part Number: 89467-33290
$181.06 MSRP: $259.65
You Save: $78.59 (31%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Air Fuel Rat
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2019-2022 Toyota RAV4 | 4 Cyl 2.5L | A25AFKS, A25AFXS; A25AFKS, A25AFXS; AXAA52L-ANZGBA, AXAA52L-ANZMBA, AXAA52L-ANZXBA, AXAA54L-ANZGBA, AXAA54L-ANZMBA, AXAA54L-ANZVBA, AXAA54L-ANZXBA, AXAH52L-ANXMBA, AXAH54L-ANXGBA, AXAH54L-ANXMBA, AXAH54L-ANXXBA, AXAL54L-ANXGBA, AXAL54L-ANXMBA, AXAL54L-ANXXBA

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Toyota RAV4 Oxygen Sensor

If you are in demand for superior quality and affordable OEM Toyota RAV4 Oxygen Sensor, then shop with us! We own a wide range of the reduced-priced genuine Toyota RAV4 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 RAV4 Oxygen Sensor Parts Questions & Experts Answers

Air Fuel Ratio Oxygen Sensor
89467-0R050
Q: How do you replace an oxygen sensor on Toyota Rav4?
A: Because the oxygen sensor is installed in the exhaust manifold or pipe, which contracts when cool, it may be very difficult to loosen when the engine is cold. To avoid damaging the sensor, especially if planning to reuse it, start and run the engine for a minute or two before shutting it off, taking care not to burn yourself during the procedure. The upstream sensor, located before the Catalytic Converter, is also known as the Air/Fuel Ratio Sensor (Bank 1, Sensor 1), while the downstream sensor, located after the catalytic converter, is referred to as the Heated Oxygen Sensor (Bank 1, Sensor 2). Begin by disconnecting the cable from the negative battery terminal. The upstream sensor can be replaced without raising the vehicle; locate it in the engine compartment, unplug the electrical connector, and unclip any interfering coolant hoses as necessary. Use a special oxygen sensor socket to unscrew the sensor. For the downstream sensor, raise the vehicle and support it on jackstands, then access the oxygen sensor harness and unplug the electrical connector. If there is insufficient space to unscrew the downstream sensor, the relevant section of the exhaust pipe may need to be removed, and applying penetrating lubricant to the bolts/threads can assist in their removal. The best tool for this task is a special slotted socket, particularly if the sensor is to be reused, so take care not to round off the hex fitting. Unscrew the sensor from the exhaust manifold or pipe, then apply anti-seize compound to the threads of the sensor to facilitate future removal. New sensors typically come pre-coated, but if reusing an old sensor, recoat the threads before installation and ensure it is tightened securely. For the downstream sensor, reinstall the exhaust pipe section and tighten the fasteners. Finally, reconnect the electrical connector of the pigtail lead to the main wiring harness, attach any necessary connector retaining clips, lower the vehicle if it was raised, and test drive to verify that no trouble codes have been set.