Oxygen Sensor Replacement Estimate for Mercedes-Benz 400E

Mercedes-Benz 400E Oxygen Sensor Replacement costs $254 on average. Following is a breakdown of the labor and parts estimates.

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YourMechanic Price
$249 to $268
Labor: $70 -$80
Parts: $179 -$188
Average Dealer price
$451 to 470
Average Shop price
$307 to 319
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CarServiceYourMechanic PriceShop/Dealer Price
1992 Mercedes-Benz 400EV8-4.2LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementYourMechanic Price$263.41Shop/Dealer Price$337.18 - $501.29
1993 Mercedes-Benz 400EV8-4.2LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementYourMechanic Price$269.78Shop/Dealer Price$345.25 - $514.23
1993 Mercedes-Benz 400EV8-4.2LService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$269.78Shop/Dealer Price$345.17 - $514.09
1992 Mercedes-Benz 400EV8-4.2LService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$259.83Shop/Dealer Price$332.78 - $494.27
Show example Mercedes-Benz 400E Oxygen Sensor Replacement prices

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

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Jeff my mechanic was fantastic and the car is running very well now. The yourmechanic.com service was a bit suspect. Not sure they have all the website/customer service kinks worked out yet but, Jeff overcame the obstacles quickly and with a great attitude. The website service did not understand what parts I needed (and its simple really, as it was just motor mounts). I suspected this and called to confirm and was told they would make sure the mechanic would have what he needed. He did not, it delayed the repair time and changed the price.
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44 years of experience
WOW!!! I loved the experience of having a mechanic come to my home. He arrived promptly, introduced himself and got right to work. He took his time to explain what he was doing, and answered all my questions. I was so surprised when he told me the repairs were still under warranty (my car is 7 years old/67,000 miles), Wow, now that is a honest mechanic!!!! :) I highly recommend "Your Mechanic". Patty/Tracy, CA 2007 Mercedes Benz "check engine light"
2007 MERCEDES-BENZ C230 - CHECK ENGINE LIGHT IS ON INSPECTION
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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