Oxygen Sensor Replacement Estimate for BMW 645Ci

BMW 645Ci Oxygen Sensor Replacement costs $295 on average. Following is a breakdown of the labor and parts estimates.

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YourMechanic Price
$278 to $325
Labor: $98 -$112
Parts: $180 -$213
Average Dealer price
$489 to 557
Average Shop price
$341 to 383
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CarServiceYourMechanic PriceShop/Dealer Price
2005 BMW 645CiV8-4.4LService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$328.61Shop/Dealer Price$421.84 - $621.47
2005 BMW 645CiV8-4.4LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementYourMechanic Price$288.46Shop/Dealer Price$371.82 - $541.47
2004 BMW 645CiV8-4.4LService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$324.34Shop/Dealer Price$416.56 - $613.04
2004 BMW 645CiV8-4.4LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementYourMechanic Price$288.46Shop/Dealer Price$371.76 - $541.37
Show example BMW 645Ci Oxygen Sensor Replacement prices

Parts required for a BMW 645Ci Oxygen Sensor Replacement

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Real customer reviews from BMW owners like you.

344 reviews
Robert
26 years of experience
The job was cancelled owing to owner's time constraints. I will call again when possible.
1998 BMW 540I - AC IS NOT WORKING INSPECTION
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283 reviews
Patrick
27 years of experience
Patrick is a great guy and really knows his stuff. Yourmechanic.com rips you a new one on parts and labor but i guess you pay for not having the headache. I paid 370 labor for 3 hours and 255 for parts that go for 65 bucks on parksgeek.com and even cheaper on a few other sites but for original bmw parts it is 65 and they charged 255. Fyi. If it can wait a couple days, buy the parts first
2005 BMW 645CI - CAMSHAFT POSITION SENSOR REPLACEMENT
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137 reviews
Richard
6 years of experience
Excellent!
1999 BMW 328I - WINDSHIELD WASHER PUMP REPLACEMENT (FRONT)
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73 reviews
Danny
6 years of experience
Very good
2009 BMW 328I XDRIVE - CAR BATTERY REPLACEMENT
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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 BMW Models