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
2004 BMW 645CiV8-4.4LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementYourMechanic Price$292.05Shop/Dealer Price$376.14 - $548.36
2005 BMW 645CiV8-4.4LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementYourMechanic Price$288.46Shop/Dealer Price$371.82 - $541.47
2005 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 - Front/Upper/Upstream ReplacementYourMechanic Price$324.34Shop/Dealer Price$416.61 - $613.13
Show example BMW 645Ci Oxygen Sensor Replacement prices

Parts required for a BMW 645Ci Oxygen Sensor Replacement

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283 reviews
Patrick
27 years of experience
He seems professional. I paid for the lights to be addressed and they are all still on including a low engine oil light. He said he would return to check it out further after his next appointment but I did not hear back from him. I was told by BMW that the power steering fluid needs to be drained, flushed and refilled. He sucked it out with a hose twice and this will not ensure that the oil that was accidentally placed in there would be completely removed. I am no mechanic but I am going off of what BMW told me. I wanted to get a lot more work done. I want all the lights to be addressed and fixed so I started with the check engine lights to be looked at and not just reset. I want everything to be fixed. Thank you
2005 BMW 645CI - OIL CHANGE
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236 reviews
Jose
12 years of experience
I have already recommend Jose to a couple employee at work and then love his work...had nothing but great things to say about him....his work was spot on.
2001 BMW 530I - CAR THERMOSTAT REPLACEMENT
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132 reviews
Alex
11 years of experience
Alex is my new go-to mechanic. He was very informative and answered all my questions. I won't use anyone else.
2011 BMW 335IS - BRAKE PADS REPLACEMENT (REAR)
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52 reviews
Rusty
18 years of experience
On-time, friendly and professional.
2006 BMW X3 - CAR IS NOT STARTING 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.

Oxygen Sensor Replacement Estimates for Popular BMW Models