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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445 reviews
Chris
17 years of experience
I am not one to make comments on my experiences with an individual or a company. I am today because I feel it is worth 5 minutes to do so. I had another mechanic from "your mechanic" come prior to this visit and fixed a few ancillary things on my Mercedes. However, there were unique issues with my electrical that had me spinning. I called the company and explained the prior situation and was at the point where if they did not fix my issues I had already decided I would never use them again. That did not happen! They called and after my lengthy explanation, not only did they come back out, but send the guy that knew Mercedes electrical better than any other. This group is stellar and if they continue to take care of people the way they did me "your Mechanic" will be a household name.
2003 MERCEDES-BENZ CLK320 - INSPECTION / DIAGNOSTICS
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197 reviews
Jeff
22 years of experience
Great
1995 MERCEDES-BENZ E320 - TUNE-UP
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61 reviews
Chad
11 years of experience
Chad is very personable and knowledgable about what he does. Stands by his work and is totally the coolest Mechanic I've ever met. He gets to know his client and really works to the clients satisfaction.
2003 MERCEDES-BENZ C320 - SPARK PLUG REPLACEMENT
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21 reviews
Eric
10 years of experience
Kept me informed for his arrival. Was very friendly.
1999 MERCEDES-BENZ S420 - OIL CHANGE
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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