Oxygen Sensor Replacement Estimate for Mercedes-Benz 400SEL

Mercedes-Benz 400SEL 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
1993 Mercedes-Benz 400SELV8-4.2LService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$273.54Shop/Dealer Price$349.84 - $521.55
1993 Mercedes-Benz 400SELV8-4.2LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementYourMechanic Price$269.78Shop/Dealer Price$345.25 - $514.23
Show example Mercedes-Benz 400SEL Oxygen Sensor Replacement prices

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

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344 reviews
Robert
26 years of experience
This is the BEST service I have ever found....the MBZ dealer was a RIP OFF and if you went to a shop you had to get a ride and it was still expensive.....I work from home and it's the perfect fit. I wish you guys mucho success. I'm referring everyone I know!!! Laura Mattos
2001 MERCEDES-BENZ C240 - OIL CHANGE
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341 reviews
Honorio
14 years of experience
Honorios was excellent. He arrived on time, and patiently worked for a few hours and all the things - changing brakes, replacing bulbs. He explained the work he did and showed how my car is different from other models. He also educated me to watch for potential repairs in the future. I would trust Honorios with any car service I have and look forward to hiring him again.
2006 MERCEDES-BENZ SLK350 - BRAKE PADS REPLACEMENT (FRONT)
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Patrick
27 years of experience
Patrick was extremely professional and polite! He arrived on time and answered all of my questions while making sure I understood each step of the repair. I will definitely be using Mymechanics for all of my future car needs. Thank you, Patrick for your exemplary work!
2002 MERCEDES-BENZ ML320 - BRAKE ROTOR/DISC REPLACEMENT (FRONT)
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248 reviews
Stefan
12 years of experience
Very knowledgeable and willing to explain what I needed done in terms I could understand.
1998 MERCEDES-BENZ ML320 - TAIL LAMP BULB REPLACEMENT (PASSENGER SIDE)
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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