Mercedes-Benz C240 Oxygen Sensor Replacement at your home or office.

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$523.25 - $1,111.91

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Oxygen Sensor Replacement Estimate for Mercedes-Benz C240

Mercedes-Benz C240 Oxygen Sensor Replacement costs $778 on average.

CarServiceEstimateShop/Dealer Price
2001 Mercedes-Benz C240V6-2.6LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$971.51Shop/Dealer Price$1213.76 - $1894.11
2001 Mercedes-Benz C240V6-2.6LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$1507.55Shop/Dealer Price$1883.91 - $2966.37
2004 Mercedes-Benz C240V6-2.6LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$976.51Shop/Dealer Price$1217.60 - $1897.09
2002 Mercedes-Benz C240V6-2.6LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$1507.55Shop/Dealer Price$1886.85 - $2971.52
2003 Mercedes-Benz C240V6-2.6LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$1507.55Shop/Dealer Price$1881.77 - $2962.63
2005 Mercedes-Benz C240V6-2.6LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$1512.55Shop/Dealer Price$1886.13 - $2966.50
2005 Mercedes-Benz C240V6-2.6LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$2133.83Shop/Dealer Price$2663.00 - $4209.53
2004 Mercedes-Benz C240V6-2.6LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$1507.55Shop/Dealer Price$1882.74 - $2964.32
Show example Mercedes-Benz C240 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.

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YourMechanic Mercedes-Benz C240 Service

Average Rating

4.9/5

Number of Reviews

91

Rating Summary
84
4
2
1
0
84
4
2
1
0

Matthew

32 years of experience
875 reviews
Matthew
32 years of experience
Mercedes-Benz C240 - Fuel Pump - Newport News, Virginia
Great personality greeted me with a warm welcoming! Explain what he would be doing, and his experience! After he did the 50 point inspection I feel he may have mistaken diagnosed my water pump! It has no leaks and it isn’t cracked not sure we’re that came from. I drove my car after Matt replaced the fuel pump and I took it to the Mercedes dealer the pulley has 4 nuts and bults one was lose and they just tighten it up for me ! Other than that Great service!

Ricardo

13 years of experience
339 reviews
Ricardo
13 years of experience
Mercedes-Benz C240 - Brake Pads Replacement (Front, Rear) - Inglewood, California
Showed up even though I felt bad for the second time that it was raining with a smile! Ricardo does a great job in a timely manner and has good communication skills.

Jason

19 years of experience
69 reviews
Jason
19 years of experience
Mercedes-Benz C240 - Crankshaft Harmonic Balancer - Fresno, California
Jason is the BEST! He is a very special person. He was very professional,courteous,reliable and knew exactly how to do the job in a timely manner. Jason is a 10+!!!!

Diego

20 years of experience
564 reviews
Diego
20 years of experience
Mercedes-Benz C240 - Window Motor / Regulator Assembly Replacement (Passenger Side Front) - Peoria, Arizona
excellent; extremely knowledgeable of a 2005 mercedes benz c2404matic; when he finished putting the regulator in and got the window functioning properly despite some really tough hurdles. Its necessary to disconnect the side door airbag SRS, and once disconnected, its very difficult to erase the SRS code. Diego was able to use a new scanner to erase the "SRS" light in the cluster. I was pleasantly surprised. I spend many hours per week on MBenz forums and almost no one has had success erasing the SRS light. Now I have a functioning passenger side power window and no more SRS warning light in the instrument cluster.

Excellent Rating


YourMechanic Mercedes-Benz C240 Service

Average Rating

4.9/5

Number of Reviews

91

Rating Summary
84
4
2
1
0
84
4
2
1
0
Number of Mercedes-Benz C240 services completed
1001+
services done by our mechanics
TOTAL NUMBER OF EXPERT Mercedes-Benz MECHANICS
900+
experts on our platform

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