Mercedes-Benz C300 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

(494)

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

(494)

Oxygen Sensor Replacement Service

How much does a Oxygen Sensor Replacement cost?

On average, the cost for a Mercedes-Benz C300 Oxygen Sensor Replacement is $275 with $180 for parts and $95 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
2009 Mercedes-Benz C300V6-3.0LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$1487.59Shop/Dealer Price$1829.13 - $2747.41
2014 Mercedes-Benz C300V6-3.5LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$1272.11Shop/Dealer Price$1583.92 - $2479.91
2016 Mercedes-Benz C300L4-2.0L TurboService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$757.45Shop/Dealer Price$940.60 - $1450.59
2018 Mercedes-Benz C300L4-2.0L TurboService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$479.45Shop/Dealer Price$585.56 - $881.40
2008 Mercedes-Benz C300V6-3.0LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$512.59Shop/Dealer Price$634.55 - $960.92
2008 Mercedes-Benz C300V6-3.0LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$1433.59Shop/Dealer Price$1775.21 - $2693.55
2013 Mercedes-Benz C300V6-3.5LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$1277.11Shop/Dealer Price$1588.68 - $2484.49
2018 Mercedes-Benz C300L4-2.0L TurboService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$484.45Shop/Dealer Price$590.82 - $886.86
Show example Mercedes-Benz C300 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

(494)

Rating Summary
468
14
5
1
6
468
14
5
1
6

Johnathan

23 years of experience
17 reviews
Johnathan
23 years of experience
Mercedes-Benz C300 V6-3.0L - Oxygen Sensor Replacement (Front/Upper/Upstream) - Bronx, New York
Gets the job done

Angel

5 years of experience
118 reviews
Angel
5 years of experience
Mercedes-Benz C300 V6-3.0L - Oxygen Sensor Replacement (Rear/Lower/Downstream) - Upper Marlboro, Maryland
Great service! Very helpful and friendly! I will be using him again! Thank you so much!

Jose

10 years of experience
285 reviews
Jose
10 years of experience
Mercedes-Benz C300 V6-3.0L - Oil Change - Tampa, Florida
Very professional and knowledgeable. Showed up on time!

Michael

11 years of experience
98 reviews
Michael
11 years of experience
Mercedes-Benz C300 V6-3.0L - Headlight Bulb Replacement (Driver Side Low Beam) - Scotch Plains, New Jersey
He was timely and efficient.

Excellent Rating

(494)

Rating Summary
468
14
5
1
6
468
14
5
1
6
Number of Mercedes-Benz C300 services completed
5434+
services done by our mechanics
TOTAL NUMBER OF EXPERT Mercedes-Benz MECHANICS
1100+
experts on our platform

Recent articles & questions

How Long Does a Camshaft Position Sensor Last?
Most Most people get in their car and crank it without ever thinking about what it takes to make this process happen. A variety of different sensors and ignition parts will have to work in conjunction in order for a...
P2078 OBD-II Trouble Code: Intake Manifold Tuning (IMT) Valve Position Sensor/Switch Circuit High
P2078 P2078 code definition Intake Manifold Tuning (IMT) Valve Position Sensor/Switch Circuit High What the P2078 code means This code will set if the Engine Control Module (ECM) (https://www.yourmechanic.com/parts/engine-control-module), or Powertrain Control Module (PCM), detects a problem with the position...
The Best Tool to Diagnose Sensor Failures
Mechanics may regularly run into sensor failures when performing a repair service. Automotive oscilloscopes help properly diagnose these issues.

car acts like battery is dead but it's not

Since you have a multimeter, check the battery voltage drop on each battery cable (https://www.yourmechanic.com/services/battery-cable-replacement) to see if the voltage drop is more than .2 volts to the starter and ground. If you have good cables and are getting a...

What is the function of the two sensors located at the clutch of the car. I know that the upper switch is the safety clutch switch

Hey there. The second sensor is the cruise control deactivation switch. If you push in the clutch when the cruise control is on, this switch shuts it off. If you do not have it connected, then most likely the cruise...

Car won't stay running unless MAF is unplugged.

Short of a vacuum leak, this seems to indicate to a dirty or failing idle air control valve. As you know, the idle air control valve monitors the air intake as it is mixed with fuel prior to being injected...

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