Mercedes-Benz R320 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

(29)

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

(29)

Oxygen Sensor Replacement Service

How much does a Oxygen Sensor Replacement cost?

On average, the cost for a Mercedes-Benz R320 Oxygen Sensor Replacement is $488 with $393 for parts and $95 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
2007 Mercedes-Benz R320V6-3.0L Turbo DieselService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$1074.91Shop/Dealer Price$1332.39 - $2065.46
2008 Mercedes-Benz R320V6-3.0L Turbo DieselService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$1054.91Shop/Dealer Price$1312.42 - $2045.51
2009 Mercedes-Benz R320V6-3.0L Turbo DieselService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$1054.91Shop/Dealer Price$1312.42 - $2045.51
2007 Mercedes-Benz R320V6-3.0L Turbo DieselService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$1057.87Shop/Dealer Price$1316.08 - $2051.36
2009 Mercedes-Benz R320V6-3.0L Turbo DieselService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$880.71Shop/Dealer Price$1094.70 - $1697.16
2008 Mercedes-Benz R320V6-3.0L Turbo DieselService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$1057.87Shop/Dealer Price$1316.12 - $2051.43
Show example Mercedes-Benz R320 Oxygen Sensor Replacement prices

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 Mercedes-Benz mechanics

Real customer reviews from Mercedes-Benz owners like you.

Excellent Rating

(29)

Rating Summary
27
2
0
0
0
27
2
0
0
0

Ben

41 years of experience
1391 reviews
Ben
41 years of experience
Mercedes-Benz R320 V6-3.0L Turbo Diesel - Oil Change - Katy, Texas

Tung

16 years of experience
310 reviews
Tung
16 years of experience
Mercedes-Benz R320 V6-3.0L Turbo Diesel - Exhaust Gas Recirculation (EGR) Tube - Marietta, Georgia
Tung worked hard and got the job done! Highly recommended.

Chris

16 years of experience
322 reviews
Chris
16 years of experience
Mercedes-Benz R320 V6-3.0L Turbo Diesel - Serpentine/Drive Belt - Spring Valley, California
Friendly

Attila

19 years of experience
884 reviews
Attila
19 years of experience
Mercedes-Benz E350 V6-3.5L - Oxygen Sensor Replacement (Front/Upper/Upstream, Rear/Lower/Downstream) - Wallington, New Jersey
Very professional , very nice person, on time came on time hi do his job, i am very satisfied he changed oxygen sensors on my mercedes , Great mechanic

Excellent Rating

(29)

Rating Summary
27
2
0
0
0
27
2
0
0
0
Number of Mercedes-Benz Oxygen Sensor Replacement services completed
319+
services done by our mechanics
TOTAL NUMBER OF EXPERT Mercedes-Benz MECHANICS
1000+
experts on our platform

Recent articles & questions

How to Buy a Good Quality Camshaft Position Sensor
The The camshaft position sensor is a vital part of your engine’s ability to function properly. It detects the position, speed, acceleration and deceleration of the camshaft, which regulates the injection of fuel into the engine. In order to make...
How to Buy a Good Quality Cylinder Head
The The cylinder head is one of the single most critical parts of your car’s mechanics, and one part that can trigger the most engine damage if it becomes compromised. The cylinder head, along with the head gasket, sits on...
How to Replace an AC Evaporator Sensor
The air conditioning pressure evaporator sensor monitors and adapts to the evaporator's temperature, preventing damage and keeping the AC working.

4 wheel drive not really working

Greetings and thank you for writing in with this question! The all-wheel drive system on the 2009 Sorento is a front-biased system that automatically sends power to the rear wheels depending on driving conditions. There is a 4-wheel drive “low”...

Traction control sensor going off after installing lift kit

Hello. It is very possible that the larger wheels and tires that you put on your vehicle are causing the traction control to go off. The traction control is designed to work with the tires that came with your Jeep...

Station wagon sputters and hesitates

It will depend on the the fault that is stored causing the service engine soon light to be illuminated. Based on the description, I would suspect either an input sensor to the engine management system, such as an oxygen sensor,...

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