Subaru Legacy Oxygen Sensor Replacement at your home or office.

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Oxygen Sensor Replacement Estimate for Subaru Legacy

Subaru Legacy Oxygen Sensor Replacement costs $257 on average. Following is a breakdown of the labor and parts estimates.

YourMechanic Price
$142 to $480
Labor: $70 -$136
Parts: $72 -$344
Average Dealer price
$237 to 847
Average Shop price
$173 to 572
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
2002 Subaru LegacyH4-2.5LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$551.40Shop/Dealer Price$684.78 - $1035.92
2008 Subaru LegacyH4-2.5LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$332.96Shop/Dealer Price$411.83 - $599.22
2012 Subaru LegacyH4-2.5L TurboService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$346.96Shop/Dealer Price$428.67 - $618.19
2006 Subaru LegacyH4-2.5L TurboService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$332.96Shop/Dealer Price$411.80 - $599.15
2012 Subaru LegacyH4-2.5LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$346.96Shop/Dealer Price$428.65 - $618.15
1998 Subaru LegacyH4-2.5LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$320.96Shop/Dealer Price$396.72 - $575.02
2006 Subaru LegacyH4-2.5LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$332.96Shop/Dealer Price$411.86 - $599.26
2009 Subaru LegacyH4-2.5LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$565.76Shop/Dealer Price$702.83 - $1064.81
Show example Subaru Legacy 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


Subaru Legacy Repair

Average Rating

4.8/5

Number of Reviews

169

Rating Summary
157
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Meet some of our expert Subaru mechanics

Real customer reviews from Subaru owners like you.

Kiri

16 years of experience
227 reviews
Kiri
16 years of experience
Amazing service by an excellent mechanic! Made his way from Philadelphia to Central New Jersey on a weekend to get the work done and I couldn't have asked for a better service. I really enjoyed watching him work and he gave me great advice about my car, very knowledgeable and his verbal skills were excellent. I'm glad he was communicable with me as other mechanics usually aren't. Thanks again for the great work and I look forward to doing business with you again in the future.
2005 SUBARU LEGACY - WHEEL BEARINGS REPLACEMENT (PASSENGER SIDE FRONT) - ENGLISHTOWN, NEW JERSEY

Emmette

32 years of experience
214 reviews
Emmette
32 years of experience
He was quick and efficient. Replaced my brakes in about an hour.
2011 SUBARU LEGACY - BRAKE PADS REPLACEMENT (FRONT, REAR) - ARLINGTON, VIRGINIA

Tyler

23 years of experience
178 reviews
Tyler
23 years of experience
Tyler was awesome to say the least. He was prompt and good about communicating with me throughout the entire process of working with him. He fixed a number of issues with my car and I have the quotes/invoices to prove that I saved over 50% by using YourMechanic over said autoshop. I will definitely look to book work with YourMechanic, and specifically Tyler, for any car care needs in the future!
2005 SUBARU LEGACY - BATTERY - HOUSTON, TEXAS

Jose

11 years of experience
175 reviews
Jose
11 years of experience
Jose was fast and efficient. He explained everything to me clearly and provided me with a quote for additional services he recommends. I've already booked him for another job.
1991 SUBARU LEGACY - BATTERY CABLE REPLACEMENT (NEGATIVE) - SAINT PETERSBURG, FLORIDA
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
2002 Subaru LegacyH4-2.5LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$551.40Shop/Dealer Price$684.78 - $1035.92
2008 Subaru LegacyH4-2.5LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$332.96Shop/Dealer Price$411.83 - $599.22
2012 Subaru LegacyH4-2.5L TurboService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$346.96Shop/Dealer Price$428.67 - $618.19
2006 Subaru LegacyH4-2.5L TurboService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$332.96Shop/Dealer Price$411.80 - $599.15
2012 Subaru LegacyH4-2.5LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$346.96Shop/Dealer Price$428.65 - $618.15
1998 Subaru LegacyH4-2.5LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$320.96Shop/Dealer Price$396.72 - $575.02
2006 Subaru LegacyH4-2.5LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$332.96Shop/Dealer Price$411.86 - $599.26
2009 Subaru LegacyH4-2.5LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$565.76Shop/Dealer Price$702.83 - $1064.81
Show example Subaru Legacy Oxygen Sensor Replacement prices

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