Oxygen Sensor Replacement Estimate for BMW 640i

BMW 640i Oxygen Sensor Replacement costs $415 on average. Following is a breakdown of the labor and parts estimates.

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YourMechanic Price
$266 to $575
Labor: $84 -$96
Parts: $182 -$479
Average Dealer price
$476 to 1069
Average Shop price
$328 to 698
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CarServiceYourMechanic PriceShop/Dealer Price
2012 BMW 640iL6-3.0L TurboService typeOxygen Sensor - Rear/Lower/Downstream ReplacementYourMechanic Price$281.15Shop/Dealer Price$360.93 - $531.67
2012 BMW 640iL6-3.0L TurboService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$591.99Shop/Dealer Price$749.62 - $1153.59
Show example BMW 640i Oxygen Sensor Replacement prices
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Parts required for a BMW 640i Oxygen Sensor Replacement

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450 reviews
36 years of experience
Overall experience is just okay; however, I felt a sense of hustle and hurry in order to move to next (appointment? maybe, i just didn't know). The core work was done; however, like this one, the dashboard indicator lights was not set off while I was told by the technician that it was all done. I knew that it took a while for him to work on the indicator..Anyway, the dashboard light (break wear indicator light) was still not set off which should be done while replacing the pad and sensor. While there maybe other things that I would complain about, I will keep that off the line at this review for this task.
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282 reviews
6 years of experience
Two thumbs up!
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73 reviews
6 years of experience
Very good
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54 reviews
22 years of experience
Before booking any services with your mechanic, I was highly doubting whether to or not. I decided to give it a shot with the inspection. The mechanic that worked with me, Peter, took all doubts away. He arrived even early to the appointment. He was very professional, and extremely helpful. The mechanic went above and beyond expectations. Had very great customer service skills, easy to talk to and explained things thoroughly about problems with the car that needed attention. He allowed me to stress a tad less about my problem, knowing he had it fully under control.
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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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