BMW 740Li xDrive Oxygen Sensor Replacement at your home or office.

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Oxygen Sensor Replacement Service

How much does a Oxygen Sensor Replacement cost?

On average, the cost for a BMW 740Li xDrive Oxygen Sensor Replacement is $955 with $465 for parts and $490 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
2013 BMW 740Li xDriveL6-3.0L TurboService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$1779.02Shop/Dealer Price$2110.20 - $3054.13
2015 BMW 740Li xDriveL6-3.0L TurboService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$1747.49Shop/Dealer Price$2067.85 - $3003.66
2015 BMW 740Li xDriveL6-3.0L TurboService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$1747.49Shop/Dealer Price$2068.00 - $3003.93
2014 BMW 740Li xDriveL6-3.0L TurboService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$1747.49Shop/Dealer Price$2067.99 - $3003.92
2013 BMW 740Li xDriveL6-3.0L TurboService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$1440.89Shop/Dealer Price$1693.77 - $2406.51
2014 BMW 740Li xDriveL6-3.0L TurboService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$1440.89Shop/Dealer Price$1685.61 - $2392.23
Show example BMW 740Li xDrive Oxygen Sensor Replacement prices

What is the Oxygen Sensor all about?

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-MATROX-1

When replacing the oxygen sensor remember:

  • Many oxygen sensors are damaged by leaking oil or coolant. If that is the case, the cause of that leak needs to be identified and repaired, or else the replacement oxygen sensor will be damaged as well.
  • New vehicles require specific oxygen sensors, and not the universal sensors that were common prior to 1996.

How it's done:

  • Scan the computer in the car for codes.
  • Inspect for vacuum leaks and holes in the exhaust system.
  • Remove and replace the oxygen sensor if it is bad.
  • Check electrical connections.
  • Check for proper operation of oxygen sensors.
  • Clear diagnostic codes.
  • Test drive car.

Our recommendation:

Keep up with the tune-ups. If check engine light is on, don't drive the car too long without getting it inspected. If check engine light is flashing, pull over and get the car towed to avoid costly repairs. Ask the mechanic to inspect the vacuum hoses and leaks in the exhaust system. If the vacuum hose or exhaust system is leaking, it will display an oxygen sensor fault code. Replacing an oxygen sensor may not fix the problem.

What common symptoms indicate you may need to replace the Oxygen Sensor?

  • Check Engine light is on.
  • Car is getting poor gas mileage.
  • Emission test fails.

How important is replacing the oxygen sensor?

Your vehicle has multiple oxygen sensors, and they all help the car run optimally. The front sensors measure how much oxygen is in the exhaust stream to measure how rich or lean the gases leaving the gas chamber are. The rear sensors measure the oxygen content of the gases as they leave the catalytic converter. The oxygen sensors then relay this information to your vehicle’s electronic control unit, so that it can adjust as necessary. Because cars depend on an ideal fuel-to-air ratio to function optimally, the oxygen sensors are leaned on for engine performance. When your oxygen sensors fail your car will run less smoothly, get worse mileage, and have worse emissions.

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Meet some of our expert BMW mechanics

Real customer reviews from BMW owners like you.

Excellent Rating

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Eduardo

13 years of experience
41 reviews
Eduardo
13 years of experience
BMW 740Li xDrive L6-3.0L Turbo - Pre-purchase Car Inspection - Villa Park, California
Eduardo is a top rate professional. I had him do a pre-purchase inspection on an out of state BMW 7 series that I am considering purchasing. He is very knowledgable, a great communicator and is willing to go the extra mile to ensure that I understood all aspects of this car, good or bad prior to making a decision to purchase. I will definitely use him again.

Christopher

6 years of experience
11 reviews
Christopher
6 years of experience
BMW 740Li xDrive L6-3.0L Turbo - Trunk Lift Support Shocks - Sacramento, California
Punctual and professional. Christopher is a good mechanic, he explained what he’s working on and how long the work is.

Joe

1 years of experience
13 reviews
Joe
1 years of experience
BMW 740Li xDrive L6-3.0L Turbo - Serpentine/Drive Belt - Norman, Oklahoma
Phenomenal mechanic and an even better person. I’ll be recommending Joe to all family and friends.

Grzegorz

42 years of experience
473 reviews
Grzegorz
42 years of experience
BMW 323i L6-2.5L - Oxygen Sensor Replacement (Rear/Lower/Downstream) - South San Francisco, California
Overall Gregory was outstanding. He is timely, explains things well to help you make educated decision before proceeding with work. However the website was misleading because it did not indicate the number parts to be replaced during request for work and only sent one part to Gregory. Had I known that there are 2 parts of the same item to be replaced I could have known how much extra cost it would be. So make sure you contact your assigned mechanic to clarify the work and parts included prior to your appointment so there are no surprises. Fortunately, Gregory was able to find another part quickly.

Excellent Rating

(40)

Rating Summary
39
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Number of BMW Oxygen Sensor Replacement services completed
440+
services done by our mechanics
TOTAL NUMBER OF EXPERT BMW MECHANICS
1200+
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