Oxygen Sensor Replacement Estimate for Mercedes-Benz 400SE

Mercedes-Benz 400SE Oxygen Sensor Replacement costs $253 on average. Following is a breakdown of the labor and parts estimates.

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YourMechanic Price
$253 to $263
Labor: $70 -$80
Parts: $183
Average Dealer price
$459
Average Shop price
$312
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CarServiceYourMechanic PriceShop/Dealer Price
1992 Mercedes-Benz 400SEV8-4.2LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementYourMechanic Price$267.68Shop/Dealer Price$342.51 - $509.83
1992 Mercedes-Benz 400SEV8-4.2LService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$264.03Shop/Dealer Price$338.06 - $502.73
Show example Mercedes-Benz 400SE Oxygen Sensor Replacement prices
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Parts required for a Mercedes-Benz 400SE Oxygen Sensor Replacement

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James did a great job replacing my radiator. He called to see if he could come a little early which worked out great. He was very professional, cleaned everything up after he was all done. Asked if I had any question about anything on my car and gave me a few pointers about an issue I was having with my hood shocks. I will for sure be calling him again when I need any service done to my car. I have already recommended him to 3 of my friends looking to get some work done on their cars.
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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.

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