Audi 100 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

(10)

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

(10)

Oxygen Sensor Replacement Estimate for Audi 100

Audi 100 Oxygen Sensor Replacement costs $312 on average.

CarServiceEstimateShop/Dealer Price
1992 Audi 100V6-2.8LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$774.11Shop/Dealer Price$970.24 - $1486.97
1989 Audi 100L5-2.3LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$254.29Shop/Dealer Price$319.60 - $466.62
1994 Audi 100V6-2.8LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$628.71Shop/Dealer Price$788.14 - $1202.86
1994 Audi 100V6-2.8LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$628.71Shop/Dealer Price$788.09 - $1202.78
1993 Audi 100V6-2.8LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$628.71Shop/Dealer Price$788.17 - $1202.93
1990 Audi 100L5-2.3LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$448.85Shop/Dealer Price$562.80 - $855.74
1991 Audi 100L5-2.3LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$259.29Shop/Dealer Price$324.36 - $471.20
1992 Audi 100V6-2.8LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$767.61Shop/Dealer Price$960.68 - $1475.11
Show example Audi 100 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

(10)

Rating Summary
10
0
0
0
0
10
0
0
0
0

Frank

8 years of experience
130 reviews
Frank
8 years of experience
Audi 100 V6-2.8L - Pre-purchase Car Inspection - Chicago, Illinois
Frank was great - kept me informed and performed a solid inspection of a vintage car that I was purchasing 800 miles from home.

Bereketeab

7 years of experience
110 reviews
Bereketeab
7 years of experience
Audi 100 V6-2.8L - Spark Plugs - Sacramento, California
Goes above and beyond, helped save my coil pack when a plug wire was stuck in it. He didn't give up and got it out and finished the job.

Mario

15 years of experience
8 reviews
Mario
15 years of experience
Audi A4 L4-2.0L Turbo - Oxygen Sensor Replacement (Front/Upper/Upstream) - San Antonio, Texas
Got the job done and vehicle running great

Shawn

12 years of experience
223 reviews
Shawn
12 years of experience
Audi A4 Quattro L4-2.0L Turbo - Oxygen Sensor Replacement (Front/Upper/Upstream) - Exton, Pennsylvania
This is a great service. Shawn was prompt and completed the work needed. i would definitely use this service again.

Excellent Rating

(10)

Rating Summary
10
0
0
0
0
10
0
0
0
0
Number of Audi Oxygen Sensor Replacement services completed
110+
services done by our mechanics
TOTAL NUMBER OF EXPERT Audi MECHANICS
700+
experts on our platform

Recent articles & questions

What Sensors Do All Cars Have? And What Optional Ones Are There?
Modern cars have an increasing amount of sensors. Most cars have an oxygen sensor and a throttle position sensor, but parking sensors are optional.
What Happens to Sensors if They are Dirty?
Car sensors can get dirty with normal use. Symptoms of dirty sensors include reduced engine power, worse gas mileage, or an engine that hesitates.
How Air Bags Work
Designed Designed to protect the occupants of a vehicle in the case of an accident, air bags inflate when the vehicle collides with another object, or otherwise suffers a sudden deceleration. Absorbing the energy of the impact, vehicle owners need...

The car has good spark and fuel but won't fire up

Hi there: In most cases, the issue you're describing is typically caused by ignition coil, distributor rotor, or crankshaft position sensor that is faulty, damaged or has an electrical harness that is pinched or damaged. It could also be fuel...

Can a faulty sensor keep the engine from starting?

Today's automobiles use many different sensors to signal engine controls and computer circuits to start a vehicle's engine and run all the programing for fuel, timing, and emissions control. Bearing this in mind, it is critical for the vehicle's main...

Car turns on and off. The brake and the steering wheel gets harder.

Hello, thanks for writing in. The P0171 is an indication of a lean mixture, which can be caused by an air leak in the intake (as you were advised), a borderline engine temp sensor reporting a warmer engine temperature than...

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