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.

Skip the repair shop - our mechanics come to you
YourMechanic Price
$258 to $268
Labor: $70 -$80
Parts: $188
Average Dealer price
$470
Average Shop price
$319
Get an instant quote for your car
Our mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing
Get a quote
CarServiceYourMechanic PriceShop/Dealer Price
1992 Mercedes-Benz 400SEV8-4.2LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementYourMechanic Price$273.54Shop/Dealer Price$349.84 - $521.55
1992 Mercedes-Benz 400SEV8-4.2LService typeOxygen Sensor - Front/Upper/Upstream 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

Meet some of our expert Mercedes-Benz mechanics

Real customer reviews from Mercedes-Benz owners like you.

212 reviews
Enrique
16 years of experience
A+ quality work, professionalism and friendliness. Enrique performed an initial inspection on my vehicle due to the temperature gauge light coming on. He arrived early and upon completion of the inspection provided me with very detailed information regarding the issue reported. I scheduled an appointment to perform the recommended work and let me just say Enrique is a jewel. Again, he arrived early he was friendly and courteous and described everything to me in detail. As soon as he completed the job, he explained what he did, why he did not have to perform certain other recommended repairs and the information was provided in such a way, that even me as a woman who knows nothing about cars could understand. I will definitely use Enrique in the future :-)
2008 MERCEDES-BENZ C300 - COOLING/RADIATOR FAN MOTOR REPLACEMENT
Want Enrique's expert advice? Ask your question now. Its free!
119 reviews
Adam
12 years of experience
Adam was on time and finished on time. One of the first mechanics in my life that I was completely impressed with.
2010 MERCEDES-BENZ CLS550 - CAR STARTER REPAIR
Want Adam's expert advice? Ask your question now. Its free!
97 reviews
Shaun
11 years of experience
Excellent service by Shaun. I would strongly recommend him
2008 MERCEDES-BENZ C300 - OIL CHANGE
Want Shaun's expert advice? Ask your question now. Its free!
62 reviews
Kevin
18 years of experience
Kevin was awesome. Gave us the answers we were looking for and much more. I will recommend him to friends as well as your service
2001 MERCEDES-BENZ SLK230 - CLUTCH IS NOT WORKING INSPECTION
Want Kevin's expert advice? Ask your question now. Its free!

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