Oxygen Sensor Replacement Estimate for BMW 645Ci

BMW 645Ci Oxygen Sensor Replacement costs $282 on average. Following is a breakdown of the labor and parts estimates.

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YourMechanic Price
$265 to $311
Labor: $98 -$112
Parts: $167 -$199
Average Dealer price
$464 to 529
Average Shop price
$326 to 366
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CarServiceYourMechanic PriceShop/Dealer Price
2004 BMW 645CiV8-4.4LService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$313.58Shop/Dealer Price$403.05 - $591.42
2005 BMW 645CiV8-4.4LService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$309.60Shop/Dealer Price$398.24 - $583.74
2004 BMW 645CiV8-4.4LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementYourMechanic Price$275.25Shop/Dealer Price$355.20 - $514.86
2005 BMW 645CiV8-4.4LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementYourMechanic Price$275.25Shop/Dealer Price$355.25 - $514.95
Show example BMW 645Ci Oxygen Sensor Replacement prices
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Parts required for a BMW 645Ci Oxygen Sensor Replacement

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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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66 reviews
Kyle
8 years of experience
Great! I explained that i neeed to purchase the car tge same day and he was able to do the inspection even earlier than what we booked. He called me right away to discuss the results. I don't know anything about mechanics and he answered all my questions.
2005 BMW X3 - PRE-PURCHASE CAR INSPECTION
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Steven
16 years of experience
Prompt, courteous and professional. Steven did a thorough pre-buy inspection that has potentially saved me thousands of dollars. The photos were exceptional and the report easy to understand. HIGHLY RECOMMENDED.
2006 BMW 325I - PRE-PURCHASE CAR INSPECTION
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Emmette
31 years of experience
I was overly impressed with Emmette and his service. He was detailed and thorough in his inspection. Will definitely use again.
2006 BMW 330I - PRE-PURCHASE CAR 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.

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