Audi A3 Oxygen Sensor Replacement at your home or office.

Our mobile mechanics offer services 7 days a week. Upfront and transparent pricing.

Estimate price near me

Service Location

customer ratings

(133)

Included for free with this service

Online Booking

Mechanic comes to you

12-month / 12k-mile warranty

Free 50 point safety inspection

Our certified mobile mechanics can come to your home or office 7 days a week between 7 AM and 9 PM.

customer ratings

(133)

Oxygen Sensor Replacement Estimate for Audi A3

Audi A3 Oxygen Sensor Replacement costs $346 on average.

CarServiceEstimateShop/Dealer Price
2008 Audi A3L4-2.0L TurboService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$458.85Shop/Dealer Price$575.57 - $870.59
2015 Audi A3L4-1.8L TurboService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$747.67Shop/Dealer Price$936.32 - $1453.38
2007 Audi A3L4-2.0L TurboService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$448.85Shop/Dealer Price$562.80 - $855.74
2015 Audi A3L4-2.0L Turbo DieselService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$714.95Shop/Dealer Price$895.38 - $1387.87
2015 Audi A3L4-1.8L TurboService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$900.09Shop/Dealer Price$1126.87 - $1758.27
2010 Audi A3L4-2.0L Turbo DieselService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$671.25Shop/Dealer Price$840.80 - $1300.54
2012 Audi A3L4-2.0L TurboService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$444.23Shop/Dealer Price$555.53 - $841.08
2008 Audi A3L4-2.0L TurboService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$423.31Shop/Dealer Price$530.04 - $800.38
Show example Audi A3 Oxygen Sensor Replacement prices

Oxygen Sensor Replacement Service

What is the Oxygen Sensor all about?

With each new model year, manufacturers are adding more oxygen sensors to better manage engine operation. Some high performance engines have an oxygen sensor for each cylinder as well as one for the rear of each catalytic convertor. The sensors are located either underneath the hood or underneath the car. The oxygen sensors are connected (screwed) to the exhaust pipe, either in front or back of the catalytic converter. The front (upstream) sensors measure the amount of oxygen in the exhaust system. The purpose of the front oxygen sensor(s) is to measure how rich or lean the gases are as the gases exit the combustion chamber. Depending upon whether the exhaust gas is lean (high in oxygen content) or rich (low in oxygen content), the amount of fuel entering the engine is adjusted by the engine management computer to try and maintain an ideal mixture that produces the lowest emissions output from the catalytic convertor.

Rear (downstream) sensors are located behind the catalytic converter. The purpose of the rear oxygen sensor(s) is to monitor the oxygen content of the exhaust gases leaving the catalytic convertor.

If one or more of the oxygen sensors are faulty, your car may not pass the emissions test. If you drive your car with a faulty oxygen sensor, you may get poor gas mileage and it can damage the catalytic converter.

Oxygen Sensor-MATROX-1

When replacing the oxygen sensor remember:

  • Many oxygen sensors are damaged by leaking oil or coolant. If that is the case, the cause of that leak needs to be identified and repaired, or else the replacement oxygen sensor will be damaged as well.
  • New vehicles require specific oxygen sensors, and not the universal sensors that were common prior to 1996.

How it's done:

  • Scan the computer in the car for codes.
  • Inspect for vacuum leaks and holes in the exhaust system.
  • Remove and replace the oxygen sensor if it is bad.
  • Check electrical connections.
  • Check for proper operation of oxygen sensors.
  • Clear diagnostic codes.
  • Test drive car.

Our recommendation:

Keep up with the tune-ups. If check engine light is on, don't drive the car too long without getting it inspected. If check engine light is flashing, pull over and get the car towed to avoid costly repairs. Ask the mechanic to inspect the vacuum hoses and leaks in the exhaust system. If the vacuum hose or exhaust system is leaking, it will display an oxygen sensor fault code. Replacing an oxygen sensor may not fix the problem.

What common symptoms indicate you may need to replace the Oxygen Sensor?

  • Check Engine light is on.
  • Car is getting poor gas mileage.
  • Emission test fails.

How important is replacing the oxygen sensor?

Your vehicle has multiple oxygen sensors, and they all help the car run optimally. The front sensors measure how much oxygen is in the exhaust stream to measure how rich or lean the gases leaving the gas chamber are. The rear sensors measure the oxygen content of the gases as they leave the catalytic converter. The oxygen sensors then relay this information to your vehicle’s electronic control unit, so that it can adjust as necessary. Because cars depend on an ideal fuel-to-air ratio to function optimally, the oxygen sensors are leaned on for engine performance. When your oxygen sensors fail your car will run less smoothly, get worse mileage, and have worse emissions.

Fast and easy service at your home or office

Backed by 12-month, 12.000-mile guarantee


Meet some of our expert Audi mechanics

Real customer reviews from Audi owners like you.

Excellent Rating

(133)

Rating Summary
125
5
3
0
0
125
5
3
0
0

Jose

6 years of experience
63 reviews
Jose
6 years of experience
A3 2012 - Loud squealing or rattling is coming from engine - San Francisco, CA
The best!

Corey

15 years of experience
184 reviews
Corey
15 years of experience
A3 2008 - Heater Blower Motor - Charlotte, NC
Great mechanic! Will continue to book everytime!

Corey

15 years of experience
184 reviews
Corey
15 years of experience
A3 2008 - Spark Plugs - Charlotte, NC
Great mechanic! Will continue to book everytime!

Dellano

13 years of experience
543 reviews
Dellano
13 years of experience
A3 2010 - Oil Pan - Rockville, MD
very helpful and knowledgeable.

Excellent Rating

(133)

Rating Summary
125
5
3
0
0
125
5
3
0
0
Number of Audi A3 services completed
1463+
services done by our mechanics
TOTAL NUMBER OF EXPERT Audi MECHANICS
700+
experts on our platform

Recent articles & questions

How to Replace an Oil Pressure Sensor on Most Cars
Oil pressure sensors fail if the sensor light blinks or stays on constantly when the pressure if acceptable or when the gauge is at zero.
How Long Does a Speed Timing Sensor Last?
Your Your car’s engine needs a considerable number of sensors in order to operate correctly. Oxygen sensors, the vehicle speed sensor, the mass airflow sensor – these are just a few of them. Your engine also needs a speed timing...
How to Replace the Oil Temperature Sensor on Most Cars
Oil, as well as the oil temperature sensor, is crucial to the engine lubrication system. A bad sensor can lead to leaks and poor vehicle performance.

Do I need a special tool to remove the knock sensor?

Hello. There does not appear to be any special tool required to remove the knock sensor on an 84 Corvette. Only the correct size socket should be needed in order to loosen and remove the sensor. The sensor is located...

P0010 -"A" Camshift Position Actuator Circuit/Open Bank 1 & OBD Bulb check failed on smog test - How to search for mechanic?

Hi there. The P0010 code is coming on for the VVT-I (variable valve timing with intelligence) system is malfunctioning. Changing the engine oil and filter could solve this issue and fix most of the problems. But if changing the engine...

Where is temperature sensor

The engine coolant temperature sensor should be located on the radiator hose fitting on the front of the engine. The connector is locked in place by a clip lock on the connector housing that needs to be depressed at the...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com