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

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Oxygen Sensor Replacement Estimate for BMW 325i

BMW 325i Oxygen Sensor Replacement costs $248 on average. Following is a breakdown of the labor and parts estimates.

YourMechanic Price
$178 to $432
Labor: $70 -$216
Parts: $108 -$216
Average Dealer price
$308 to 684
Average Shop price
$218 to 495
Get an instant quote for your car
Our mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing
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CarServiceEstimateShop/Dealer Price
1991 BMW 325iL6-2.5LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$285.10Shop/Dealer Price$364.29 - $544.67
2002 BMW 325iL6-2.5LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$463.08Shop/Dealer Price$600.53 - $857.79
2004 BMW 325iL6-2.5LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$621.24Shop/Dealer Price$798.02 - $1173.74
2001 BMW 325iL6-2.5LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$444.32Shop/Dealer Price$576.97 - $820.07
2002 BMW 325iL6-2.5LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$444.32Shop/Dealer Price$576.81 - $819.79
2004 BMW 325iL6-2.5LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$532.64Shop/Dealer Price$687.13 - $996.30
1995 BMW 325iL6-2.5LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$285.10Shop/Dealer Price$364.44 - $544.93
1992 BMW 325iL6-2.5LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$285.10Shop/Dealer Price$364.40 - $544.87
Show example BMW 325i Oxygen Sensor Replacement prices

Oxygen Sensor Replacement Service & Cost

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

Keep in mind:

  • 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 this service?

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 Oxygen Sensor Replacement service at your home or office.

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Excellent Rating


BMW 325i Repair

Average Rating

4.7/5

Number of Reviews

236

Rating Summary
227
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Meet some of our expert BMW mechanics

Real customer reviews from BMW owners like you.

Tien

19 years of experience
623 reviews
Tien
19 years of experience
Tien is a real pro. Always thorough and gets the job done.
2003 BMW 525I - OXYGEN SENSOR REPLACEMENT (FRONT/UPPER/UPSTREAM) - OAKLAND, CALIFORNIA

Grzegorz

37 years of experience
388 reviews
Grzegorz
37 years of experience
Very professional and honest! Took the time to explain the problem as well as what he was fixing, etc. Upfront about pricing and what it costs for additional services. Friendly personality too!
2002 BMW 325I - ROUGH IDLE IN MORNING AND REPEATEDLY THROWS P1349 AND P1351 CODES FOR POWERTRAIN. LAST SHOP WANTED TO REPLACE ALL SPARK PLUGS AND IGNITION COILS - ALL 6 PLUGS AND COILS HAVE BEEN REPLACED RECENTLY AND CODES/ROUGH IDLE STILL OCCURS. ALSO, CENTRAL DOOR LOCK AND EMERGENCY LIGHT BUTTON DOES NOT WORK. - BELMONT, CALIFORNIA

Alex

12 years of experience
318 reviews
Alex
12 years of experience
Alex did a great job and did the last time as well. Very helpful and knowledgeable.
2009 BMW 328I - OXYGEN SENSOR REPLACEMENT (FRONT/UPPER/UPSTREAM) - FRISCO, TEXAS

Duane

21 years of experience
216 reviews
Duane
21 years of experience
Duane was excellent. On time and very knowledgeable and informative. The man knows his cars! He did the diagnosis and corrected the issue. I was very pleased with his findings and his knowledge. He was very courteous.
2003 BMW 325I - CHECK ENGINE LIGHT IS ON - CARLSBAD, CALIFORNIA
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
CarServiceEstimateShop/Dealer Price
1991 BMW 325iL6-2.5LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$285.10Shop/Dealer Price$364.29 - $544.67
2002 BMW 325iL6-2.5LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$463.08Shop/Dealer Price$600.53 - $857.79
2004 BMW 325iL6-2.5LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$621.24Shop/Dealer Price$798.02 - $1173.74
2001 BMW 325iL6-2.5LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$444.32Shop/Dealer Price$576.97 - $820.07
2002 BMW 325iL6-2.5LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$444.32Shop/Dealer Price$576.81 - $819.79
2004 BMW 325iL6-2.5LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$532.64Shop/Dealer Price$687.13 - $996.30
1995 BMW 325iL6-2.5LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$285.10Shop/Dealer Price$364.44 - $544.93
1992 BMW 325iL6-2.5LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$285.10Shop/Dealer Price$364.40 - $544.87
Show example BMW 325i Oxygen Sensor Replacement prices

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