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.

Skip the repair shop - our mechanics come to you
YourMechanic Price
$278 to $325
Labor: $98 -$112
Parts: $180 -$213
Average Dealer price
$489 to 557
Average Shop price
$341 to 383
Get an instant quote for your car
Our mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing
Get a quote
CarServiceYourMechanic PriceShop/Dealer Price
2005 BMW 645CiV8-4.4LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementYourMechanic Price$292.05Shop/Dealer Price$376.14 - $548.36
2004 BMW 645CiV8-4.4LService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$324.34Shop/Dealer Price$416.67 - $613.24
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 - 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

Meet some of our expert BMW mechanics

Real customer reviews from BMW owners like you.

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
Want Patrick's expert advice? Ask your question now. Its free!
164 reviews
Theodore
11 years of experience
Theodore was very meticulous with his work. Since I couldn't find anyone in the Seattle area, he came all the way from Redmond. He changed all the spark plugs in my car. I was thinking of changing all the ignition coils of my engine but Theodore insisted I should change the one that reported misfire and helped me save some money. He also spent some time diagnosing other problems I had - screeching sound from the air conditioner and suggested what I should do. Also he advised me to change the air conditioner filter and buy it from Amazon because it is cheaper.
2007 BMW 328I - SPARK PLUG REPLACEMENT
Want Theodore's expert advice? Ask your question now. Its free!
94 reviews
Eugenio
21 years of experience
Without a doubt exceptional service and a good character.
2006 BMW 530XI - SPARK PLUG REPLACEMENT
Want Eugenio's expert advice? Ask your question now. Its free!
77 reviews
Richard
6 years of experience
Great guy. Very competent and honest. He will be my mechanic for now on.
2007 BMW 328I - OIL/FLUID LEAK INSPECTION
Want Richard's expert advice? Ask your question now. Its free!

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