How should oxygen sensors be serviced to avoid damage and ensure proper installation on Audi A4?

The catalytic converter(s) are fitted with oxygen sensors, which may be hard to loosen when the engine is cold because of contraction. One should begin and run the engine at least one minute or two to prevent burns when removing threads of the sensor and mounting it on the engine. When replacing an oxygen sensor, be careful about the pigtail and electrical connector permanently fixed to it, do not damage or take them out. Always keep the electrical connector, and the louvered end, clean and dry, and never apply any cleaning solvents on the sensor. Oxygen sensors are very sensitive hence should not be dropped or roughly handled and the silicone boot should be aligned well so as to avoid melting and malfunctioning of the oxygen sensor. In the case of upstream sensors, find and unconnect the electrical connector, and unattach the sensor harness to clips and unscrew the sensor with a oxygen sensor socket in tight spaces. When replacing an old sensor, it is necessary to put anti-seize compound on the threads; with new sensors, this is not necessary since they already have it. The reverse order is followed in installation with appropriate torque. In the case of downstream sensors, lift the vehicle and find and un-plug the electrical connector, unscrew the sensor, and apply an anti-seize compound in case of replacing the old sensor. Once again, installation is the opposite of the removal process and the proper torque is taken into consideration.

Genuine Audi A4 Oxygen Sensor

Oxygen O2 Sensor

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28 Oxygen Sensors found

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Audi A4 Front Oxygen Sensor Part Number: 8W0-906-265-AP
$92.82 MSRP: $130.00
You Save: $37.18 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Oxygen Sen; Front Oxygen Sensor, Oxygen Sensor
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2020 Audi A4 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L GAS
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Audi A4 Rear Oxygen Sensor Part Number: 8W0-906-265-AQ
$102.70 MSRP: $143.83
You Save: $41.13 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Oxygen Sen; Oxygen Sensor, Rear Oxygen Sensor
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2020 Audi A4 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L GAS
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Audi A4 Rear Oxygen Sensor Part Number: 8K0-906-262-G
$141.61 MSRP: $198.33
You Save: $56.72 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Oxygen Sensor
- Position: Rear
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2018-2020 Audi A4 | Premium, Premium Plus, Prestige, Titanium | 4 Cyl 2.0 L GAS
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Audi A4 Rear Oxygen Sensor Part Number: 8W0-906-262-G
$184.45 MSRP: $258.33
You Save: $73.88 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Oxygen Sen; Oxygen Sensor, Rear Oxygen Sensor
- Replaces: 80A-906-262, 8K0-906-262-F
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2017-2020 Audi A4 | Premium, Premium Plus, Prestige, Titanium | 4 Cyl 2.0 L GAS
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Audi A4 Rear Oxygen Sensor Part Number: 078-906-265-F
$157.08 MSRP: $220.00
You Save: $62.92 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Oxygen Sensor; Rear Oxygen Sensor
- Position: Left
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 1996-2001 Audi A4 | Avant, Base | 6 Cyl 2.8 L GAS
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Audi A4 Rear Oxygen Sensor Part Number: 06E-906-265-E
$190.39 MSRP: $266.65
You Save: $76.26 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Oxygen Sensor; Rear Oxygen Sensor
- Position: Right
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2006 Audi A4 | Base | 6 Cyl 3.2 L GAS
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Audi A4 Oxygen Sensor Part Number: 021-906-265-AG
$174.93 MSRP: $245.00
You Save: $70.07 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 1997-1998 Audi A4 | Base | 4 Cyl 1.8 L GAS
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Audi A4 Front Oxygen Sensor Part Number: 021-906-265-AK
$185.64 MSRP: $260.00
You Save: $74.36 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Oxygen Sensor; Front Oxygen Sensor
- Replaces: 078-906-265-L, 037-906-265-AB, 021-906-265-AD, 021-906-265-AF, 077-906-265-D
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 1997-2001 Audi A4 | Base | 4 Cyl 1.8 L GAS, 6 Cyl 2.8 L GAS
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Audi A4 Front Oxygen Sensor Part Number: 06L-906-262-G
$220.15 MSRP: $308.32
You Save: $88.17 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Oxygen Sen; Front Oxygen Sensor, Oxygen Sensor
- Replaces: 06L-906-262-E, 8K0-906-262-C
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2017-2020 Audi A4 | Premium, Premium Plus, Prestige, Titanium | 4 Cyl 2.0 L GAS
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Audi A4 Rear Oxygen Sensor Part Number: 06E-906-265-N
$227.87 MSRP: $319.16
You Save: $91.29 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Oxygen Sensor
- Position: Rear
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2006-2008 Audi A4 | Base | 6 Cyl 3.2 L GAS
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Audi A4 Rear Oxygen Sensor Part Number: 06E-906-265-P
$225.26 MSRP: $315.49
You Save: $90.23 (29%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Oxygen Sensor
- Position: Rear
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2006-2008 Audi A4 | Base | 6 Cyl 3.2 L GAS
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Audi A4 Rear Oxygen Sensor Part Number: 06E-906-265-Q
$230.86 MSRP: $323.34
You Save: $92.48 (29%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Oxygen Sensor; Rear Oxygen Sensor
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2016 Audi A4 | Premium, Premium Plus | 4 Cyl 2.0 L GAS
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Audi A4 Rear Oxygen Sensor Part Number: 06E-906-265-D
$210.62 MSRP: $294.98
You Save: $84.36 (29%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Oxygen Sensor; Rear Oxygen Sensor
- Position: Left
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2006 Audi A4 | Base | 6 Cyl 3.2 L GAS
View related parts
Audi A4 Rear Oxygen Sensor Part Number: 078-906-265-G
$203.79 MSRP: $285.42
You Save: $81.63 (29%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Oxygen Sensor; Rear Oxygen Sensor
- Position: Right
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 1996-2001 Audi A4 | Avant, Base | 6 Cyl 2.8 L GAS
View related parts
Audi A4 Rear Oxygen Sensor Part Number: 1K0-998-262
$267.74 MSRP: $374.98
You Save: $107.24 (29%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Oxygen Sensor Kt; Rear Oxygen Sensor
- Replaces: 077-906-262-G, 06A-906-262-BA, 06A-906-262-AG, 06A-906-262-AK, 077-906-262-B, 06A-906-265-M, 06C-906-265-E, 06A-906-262-AL, 077-906-265-AE, 06A-906-262-Q, 058-906-265-B, 021-906-262-C, 023-906-262, 06C-906-265-A, 06C-906-265, 06A-906-262-P, 077-906-262-C, 078-906-265-T, 078-906-265-AA, 077-906-265-AD, 058-906-265-C
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2000-2006 Audi A4 | Base, Cabriolet | 4 Cyl 1.8 L GAS, 6 Cyl 3.0 L GAS
View related parts
Audi A4 Front Oxygen Sensor Part Number: 1K0-998-262-AB
$267.74 MSRP: $374.98
You Save: $107.24 (29%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Oxygen Sensor Kt; Front Oxygen Sensor, Rear Oxygen Sensor
- Replaces: 3A0-973-334, 077-906-265-K, 078-906-265-M, 077-906-265-AF, 077-906-265-H, 077-906-265-R, 077-906-265-T, 078-906-265-N, 077-906-265-L, 078-906-265-P
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2000-2001 Audi A4 | Base | 6 Cyl 2.8 L GAS
View related parts
Audi A4 Rear Oxygen Sensor Part Number: 1K0-998-262-E
$267.74 MSRP: $374.98
You Save: $107.24 (29%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Oxygen Sensor Kt; Rear Oxygen Sensor
- Replaces: 06J-906-262-J, 06J-906-262-C, 06D-906-265, 06F-906-265, 022-906-262-CB, 022-906-262-BT
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2003-2009 Audi A4 | Base, Cabriolet | 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L GAS
View related parts
Audi A4 Rear Oxygen Sensor Part Number: 1K0-998-262-R
$267.74 MSRP: $374.98
You Save: $107.24 (29%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Oxygen Sensor Kt; Rear Oxygen Sensor
- Replaces: 06C-906-265-L, 022-906-262-K, 022-906-265-C, 06C-906-265-M
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2005 Audi A4 | Base, Cabriolet | 6 Cyl 3.0 L GAS
View related parts
Audi A4 Rear Oxygen Sensor Part Number: 1K0-998-262-T
$240.96 MSRP: $337.48
You Save: $96.52 (29%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Oxygen Sensor Kt; Rear Oxygen Sensor
- Position: Left
- Replaces: 06F-906-262-P, 06A-906-262-CL, 06F-906-262-AE, 06H-906-262-A, 06J-906-262-N, 06J-906-262-K
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2009-2016 Audi A4 | Base, Premium, Premium Plus, Prestige | 4 Cyl 2.0 L GAS
View related parts
Audi A4 Front Oxygen Sensor Part Number: 1K0-998-262-F
$295.12 MSRP: $413.33
You Save: $118.21 (29%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Oxygen Sensor Kt; Front Oxygen Sensor
- Replaces: 06A-906-262-BD, 06C-906-265-B, 06A-906-262-BE, 06A-906-262-AE
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2008, 2002-2005 Audi A4 | Base, Cabriolet | 6 Cyl 3.0 L GAS, 6 Cyl 3.2 L GAS

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1-20 of 28 Results

Audi A4 Oxygen Sensor

The primary role of the Audi A4 Oxygen Sensor is to verify the residual oxygen in the exhaust in order to adjust the fuel and reduce emissions through the engine computer. A hot zirconia core and threaded steel shell with platinum coatings generate a voltage ranging between 0.1 and 0.9 volts, which increases when the mix is rich and decreases when lean. That quick signal leaves the control unit in closed loop, continually adjusting injector pulse width to achieve catalytic converter efficiency. Currently installed Audi A4 models have no fewer than one upstream sensor to provide feedback on the mixture and one sensor to monitor converter health, whereas V-configuration engines have twice that number per bank. The majority of automobiles have the narrow band Oxygen Sensor, though more recent Audi A4 models have the wideband air-fuel ratio sensor, which measures a broader range of mixtures by reporting a current rather than a voltage, providing the computer with finer information. Wideband or otherwise, every Audi A4 sensor is subjected to heat, carbon, silicone, coolant or oil deposits that slow reaction and increase emissions. Owners can clean an aging Oxygen Sensor overnight in gasoline, check its output with a multimeter in search of about 0.8 volts under a rich condition, and replace it when warning lights or poor mileage results develop, usually at about 100,000 miles. With or without the presence of a wideband design or a narrow band design, a healthy Audi Oxygen Sensor makes combustion smooth sailing, mileage robust and emissions minimal.

Choose original equipment manufacturer Oxygen Sensor for great performance and strong durability. They use Audi's official craftsmanship and high-grade materials, and meet strict quality standards. Are you looking for quality Oxygen Sensor at a good price? Come to our online store. We carry a wide range of genuine parts for your Audi A4 and the prices are competitive. Each part comes with the manufacturer's warranty. You can install with confidence and get steady results. Over time, you'll save money and avoid hassle. Keep your maintenance simple and protect your vehicle with OEM parts. Get the quality your A4 needs now.

Audi A4 Oxygen Sensor Parts and Q&A

Rear Oxygen Sensor
06E-906-265-D
Q: How should oxygen sensors be serviced to avoid damage and ensure proper installation on Audi A4?
A:
The Catalytic Converter(s) are fitted with oxygen sensors, which may be hard to loosen when the engine is cold because of contraction. One should begin and run the engine at least one minute or two to prevent burns when removing threads of the sensor and mounting it on the engine. When replacing an oxygen sensor, be careful about the pigtail and electrical connector permanently fixed to it, do not damage or take them out. Always keep the electrical connector, and the louvered end, clean and dry, and never apply any cleaning solvents on the sensor. Oxygen sensors are very sensitive hence should not be dropped or roughly handled and the silicone boot should be aligned well so as to avoid melting and malfunctioning of the oxygen sensor. In the case of upstream sensors, find and unconnect the electrical connector, and unattach the sensor harness to clips and unscrew the sensor with a oxygen sensor socket in tight spaces. When replacing an old sensor, it is necessary to put anti-seize compound on the threads; with new sensors, this is not necessary since they already have it. The reverse order is followed in installation with appropriate torque. In the case of downstream sensors, lift the vehicle and find and un-plug the electrical connector, unscrew the sensor, and apply an anti-seize compound in case of replacing the old sensor. Once again, installation is the opposite of the removal process and the proper torque is taken into consideration.