Mercedes-Benz S350 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

(6)

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

(6)

Oxygen Sensor Replacement Service

How much does a Oxygen Sensor Replacement cost?

On average, the cost for a Mercedes-Benz S350 Oxygen Sensor Replacement is $304 with $209 for parts and $95 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
2013 Mercedes-Benz S350V6-3.0L Turbo DieselService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$1095.35Shop/Dealer Price$1357.94 - $2106.34
2012 Mercedes-Benz S350V6-3.0L Turbo DieselService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$1054.91Shop/Dealer Price$1312.42 - $2045.51
2012 Mercedes-Benz S350V6-3.0L Turbo DieselService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$1075.35Shop/Dealer Price$1337.97 - $2086.39
2006 Mercedes-Benz S350V6-3.7LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$1272.11Shop/Dealer Price$1583.88 - $2479.84
1995 Mercedes-Benz S350L6-3.4L Turbo DieselService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$590.95Shop/Dealer Price$732.50 - $1117.64
1995 Mercedes-Benz S350L6-3.4L Turbo DieselService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$559.51Shop/Dealer Price$693.17 - $1054.71
1994 Mercedes-Benz S350L6-3.4L Turbo DieselService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$564.51Shop/Dealer Price$697.93 - $1059.29
2006 Mercedes-Benz S350V6-3.7LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$517.59Shop/Dealer Price$639.94 - $966.59
Show example Mercedes-Benz S350 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

(6)

Rating Summary
5
0
0
0
1
5
0
0
0
1

Rigoberto

11 years of experience
739 reviews
Rigoberto
11 years of experience
Mercedes-Benz S350 V6-3.7L - Battery - Chicago, Illinois
The experience was great! Very professional, prompt, courteous and knowledgable. I will be a return customer. Sincerely, Brad White

Omar

12 years of experience
287 reviews
Omar
12 years of experience
Mercedes-Benz S350 V6-3.7L - Brake Pads Replacement (Front, Rear) - Fort Lauderdale, Florida
He was on time, transparent, extremely communicative about the process and procedures. Polite and extremely respectful.

Mohammed

9 years of experience
152 reviews
Mohammed
9 years of experience
Mercedes-Benz S350 L6-3.4L Turbo Diesel - Fuel Gauge Sender - Raleigh, North Carolina
AAA mechanic very polite and courteous.

Mark

41 years of experience
77 reviews
Mark
41 years of experience
Mercedes-Benz S350 V6-3.7L - Serpentine/Drive Belt - Alpharetta, Georgia
Fixed my car. Nice guy. A+

Excellent Rating

(6)

Rating Summary
5
0
0
0
1
5
0
0
0
1
Number of Mercedes-Benz S350 services completed
66+
services done by our mechanics
TOTAL NUMBER OF EXPERT Mercedes-Benz MECHANICS
1100+
experts on our platform

Recent articles & questions

Symptoms of a Bad or Failing Manifold Temperature Sensor
Common signs include a rough idle, lack of power, high NOx production, and emissions test failure.
How Long Does a Low Oil Level Sensor Last?
Having Having the right amount of oil in an engine is important to the smooth running of your engine. In order for the engine on a car to run as intended, it will have to have the right amount of...
How to Replace a Car Battery Temperature Sensor
The battery has a battery temperature sensor that can fail if the Check Engine Light comes on, the battery voltage is low, or the RPM curve surges.

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...

Warning lights and PO344 Camshaft Position Sensor

This vehicle came with three different engines and they all have different directions to replace the sensors. The sensors also may have specialized removal and installation procedures that require special tools for the seals and sensors. The code P0344 is...

My truck is bucking at different speeds but it smooths out during acceleration.

Hi there. Check the contacts to the engine oil temperature sensor. See if the contacts are loose and if they are falling off. Also, check the wiring to the sensor and see if its over a spark plug wire. Its...

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