BMW 325xi Oxygen Sensor Replacement at your home or office.

Our mobile mechanics offer services 7 days a week. Upfront and transparent pricing.

Estimate price near me

Service Location

Customer Ratings

(83)

Included for free with this service

Online Booking

Mechanic comes to you

12-month / 12k-mile warranty

Free 50 point safety inspection

Our certified mobile mechanics can come to your home or office 7 days a week between 7 AM and 9 PM.

Customer Ratings

(83)

Oxygen Sensor Replacement Service

How much does a Oxygen Sensor Replacement cost?

On average, the cost for a BMW 325xi Oxygen Sensor Replacement is $502 with $180 for parts and $322 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
2003 BMW 325xiL6-2.5LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$854.66Shop/Dealer Price$980.71 - $1320.59
2002 BMW 325xiL6-2.5LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$754.85Shop/Dealer Price$853.69 - $1130.69
2001 BMW 325xiL6-2.5LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$754.85Shop/Dealer Price$853.81 - $1130.91
2006 BMW 325xiL6-3.0LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$1379.70Shop/Dealer Price$1648.15 - $2436.70
2005 BMW 325xiL6-2.5LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$830.33Shop/Dealer Price$955.11 - $1294.04
2006 BMW 325xiL6-3.0LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$1172.70Shop/Dealer Price$1389.97 - $2023.69
2002 BMW 325xiL6-2.5LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$830.33Shop/Dealer Price$948.23 - $1281.99
2003 BMW 325xiL6-2.5LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$754.85Shop/Dealer Price$853.80 - $1130.89
Show example BMW 325xi 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.

Fast and easy service at your home or office

Backed by 12-month, 12.000-mile guarantee


Meet some of our expert BMW mechanics

Real customer reviews from BMW owners like you.

Excellent Rating

(83)

Rating Summary
74
4
1
0
4
74
4
1
0
4

Joseph

21 years of experience
718 reviews
Joseph
21 years of experience
BMW 325xi L6-3.0L - Starter - Clearfield, Utah
Quick and professional! Would recommend!

Henry

35 years of experience
177 reviews
Henry
35 years of experience
BMW 325xi L6-3.0L - Spark Plugs - Glassboro, New Jersey
Friendly and courteous, showed up on time and provided quick service! Highly recommend.

Daniel

12 years of experience
252 reviews
Daniel
12 years of experience
BMW 325xi L6-3.0L - Variable Valve Timing (VVT) Solenoid - Franklin Park, Illinois
Daniel is a very knowledgeable mechanic. He knows a lot about BMW and gave great recommendations as to my next service. He is very clean with his work and actually showed me evidence that my power steering fluid was basically black. Due to the issue of my vehicle needing a variable timing solenoid, my rpms were racing. After the repair, I was standing next to the car and did not realize it was even on! That is how guiet it sounded. I plan to personally request Daniel every time my vehicle needs to be serviced.

Joshua

28 years of experience
709 reviews
Joshua
28 years of experience
BMW 325xi L6-3.0L - Water Pump - Oakland, California
On time and did a great job of replacing water pump and thermostat very quickly

Excellent Rating

(83)

Rating Summary
74
4
1
0
4
74
4
1
0
4
Number of BMW 325xi services completed
913+
services done by our mechanics
TOTAL NUMBER OF EXPERT BMW MECHANICS
1200+
experts on our platform

Recent articles & questions

How Long Does an Injector Control Pressure Sensor Last?
A A diesel engine is a very sensitive and complicated piece of machinery. Getting a diesel to crank will require a number of parts to work together. Among the most vital systems on a diesel engine is the fuel injection....
How to Replace a Yaw Rate Sensor
Yaw rate sensors monitor traction, stability, and the anti-lock braking system to alert you when the car tilts at an unsafe degree.
What Sensors Do All Cars Have? And What Optional Ones Are There?
Modern cars have an increasing amount of sensors. Most cars have an oxygen sensor and a throttle position sensor, but parking sensors are optional.

Dash board showing "HOLD". What's wrong with having a code P0841?

Hi there. The code P0841 (https://www.yourmechanic.com/article/p0841-obd-ii-trouble-code-transmission-fluid-pressure-sensor-switch-a-circuit-range-performance-by-valerie-johnston) means that the pressure in the transmission has dropped. This could be caused by low or dirty contaminated oil or the transmission fluid pressure sensor failing. Check the level of the transmission with the...

Could the low oil level sensor be accidentally knocked off during an oil change on a es330 Lexus 2005. My engine recently seized up.

Hi there. Look all around the engine and around the oil pan and filter. Look for any signs of oil leakage. If there is no oil leakage, then check the engine oil level. If the oil level is full, then...

Valvetronic operation on N42 engine.

The valvetronic motor is stuck or not functioning properly and causing the engine to not start up. I recommend replacing the valvetronic motor. The motor is designed to cycle itself when turning on the ignition, so it is good to...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com