Mercedes-Benz ML400 Oxygen Sensor Replacement at your home or office.

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Oxygen Sensor Replacement Service

How much does a Oxygen Sensor Replacement cost?

On average, the cost for a Mercedes-Benz ML400 Oxygen Sensor Replacement is $637 with $400 for parts and $237 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
2015 Mercedes-Benz ML400V6-3.0L TurboService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$1087.20Shop/Dealer Price$1330.88 - $1963.49
2015 Mercedes-Benz ML400V6-3.0L TurboService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$1203.40Shop/Dealer Price$1488.71 - $2246.02
Show example Mercedes-Benz ML400 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.

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Meet some of our expert Mercedes-Benz mechanics

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Excellent Rating

(30)

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Cyrus

35 years of experience
110 reviews
Cyrus
35 years of experience
Mercedes-Benz S550 V8-5.5L - Oxygen Sensor Replacement (Front/Upper/Upstream, Rear/Lower/Downstream) - Atlanta, Georgia
He was very knowledgeable and punctual.

Attila

19 years of experience
906 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

James

31 years of experience
684 reviews
James
31 years of experience
Mercedes-Benz ML320 V6-3.2L - Oxygen Sensor Replacement (Front/Upper/Upstream, Rear/Lower/Downstream) - Irvine, California
Very knowledgeble and professioal.

Faraz

22 years of experience
59 reviews
Faraz
22 years of experience
Mercedes-Benz C250 L4-1.8L Turbo - Oxygen Sensor Replacement (Front/Upper/Upstream) - Fremont, California
He is very friendly and knowledgeable.

Excellent Rating

(30)

Rating Summary
28
2
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28
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Number of Mercedes-Benz Oxygen Sensor Replacement services completed
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services done by our mechanics
TOTAL NUMBER OF EXPERT Mercedes-Benz MECHANICS
1100+
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