Oxygen Sensor Replacement Estimate for Mercedes-Benz 400SE

Mercedes-Benz 400SE Oxygen Sensor Replacement costs $259 on average. Following is a breakdown of the labor and parts estimates.

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YourMechanic Price
$258 to $268
Labor: $70 -$80
Parts: $188
Average Dealer price
$470
Average Shop price
$319
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CarServiceYourMechanic PriceShop/Dealer Price
1992 Mercedes-Benz 400SEV8-4.2LService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$273.54Shop/Dealer Price$349.84 - $521.55
1992 Mercedes-Benz 400SEV8-4.2LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementYourMechanic Price$269.78Shop/Dealer Price$345.25 - $514.23
Show example Mercedes-Benz 400SE Oxygen Sensor Replacement prices

Parts required for a Mercedes-Benz 400SE Oxygen Sensor Replacement

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282 reviews
Mark
6 years of experience
Mark was very professional and thorough. He kept communicating with me before the appointment and did the job extremely well. He also explained to me about the existing issues with the car and I will definitely book the next appointment with him.
2006 MERCEDES-BENZ SLK350 - OIL CHANGE
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256 reviews
Jay
32 years of experience
He was fast and competent
2008 MERCEDES-BENZ C300 - 20,000 MILES MAINTENANCE SERVICE
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145 reviews
James
26 years of experience
He came prepared and came early. Did a lot of tests and discovered that I needed a fuel pump along with some other repairs.
2003 MERCEDES-BENZ C32 AMG - CAR IS NOT STARTING INSPECTION
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137 reviews
Richard
6 years of experience
Richard is very knowledgeable about my mercedes benz. I like that he explains and teaches me about my vehicle as he repairs it. He is an excellent mechanic.
2008 MERCEDES-BENZ E350 - CAR THERMOSTAT REPLACEMENT
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All about Oxygen Sensor Replacement

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 Replacement Estimates for Popular Mercedes-Benz Models