Subaru Forester 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

(3)

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

(3)

Oxygen Sensor Replacement Service

How much does a Oxygen Sensor Replacement cost?

On average, the cost for a Subaru Forester Oxygen Sensor Replacement is $336 with $126 for parts and $210 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
2015 Subaru ForesterH4-2.5LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$650.96Shop/Dealer Price$760.98 - $1078.87
2014 Subaru ForesterH4-2.5LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$732.85Shop/Dealer Price$864.06 - $1251.52
2015 Subaru ForesterH4-2.0L TurboService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$692.54Shop/Dealer Price$810.26 - $1156.71
2000 Subaru ForesterH4-2.5LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$538.25Shop/Dealer Price$620.85 - $862.38
2007 Subaru ForesterH4-2.5LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$671.33Shop/Dealer Price$789.41 - $1132.41
1999 Subaru ForesterH4-2.5LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$526.15Shop/Dealer Price$605.93 - $838.55
2005 Subaru ForesterH4-2.5LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$683.57Shop/Dealer Price$802.52 - $1153.06
2016 Subaru ForesterH4-2.5LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$773.67Shop/Dealer Price$915.12 - $1333.22
Show example Subaru Forester 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 Subaru mechanics

Real customer reviews from Subaru owners like you.

Excellent Rating

(3)

Rating Summary
3
0
0
0
0
3
0
0
0
0

Excellent Rating

(3)

Rating Summary
3
0
0
0
0
3
0
0
0
0
Number of Subaru Forester Oxygen Sensor Replacement services completed
33+
services done by our mechanics
TOTAL NUMBER OF EXPERT Subaru MECHANICS
800+
experts on our platform

Recent articles & questions

Can Sensors Be Cleaned or Do They Need to Be Replaced?
In In most cases, sensors for your automobile will need to be replaced if they fail, but depending on the type of sensor and its location or function, some can be cleaned and reused (https://www.yourmechanic.com/question/can-sensors-be-cleaned-or-do-they-need-to-be-replaced). Sensors can come in many...
How Long Does a Speedometer Sensor Last?
While While a mechanical speedometer will use a speedometer cable attached to the driveshaft and transmission, that’s not the case with an electronic speedometer, such as is used in most modern vehicles. These use a speedometer sensor. It’s mounted to...
Symptoms of a Bad or Failing Yaw Rate Sensor
Common signs include the Check Engine Light, Vehicle Stability, or Traction Control Lights coming on and the Stability Control Light flashing.

Car starts up and cuts off after a while of driving

This may be likely related to a fuel pump issue (https://www.yourmechanic.com/services/fuel-pump-replacement) or lack of fuel pressure. Low fuel pressure is something that can cause your car to struggle to idle (https://www.yourmechanic.com/services/car-idle-is-rough-inspection) or even stall (https://www.yourmechanic.com/services/car-is-stalling-inspection) when driving. This will also...

Stalling,bad fuel mileage,won't start without Acceleration, rough idling.

This may be related to a couple of different things. I would recommend checking the idle air control valve/module (https://www.yourmechanic.com/services/idle-control-valve-replacement) which works similar to the MAF sensor (https://www.yourmechanic.com/services/mass-airflow-sensor-replacement) in that it regulates air intake as it is mixed with fuel...

Can an overheated engine cause a knock sensor to fail?

Hi there. From the description you have given, seems odd hitting a bird would damage the radiator, the condenser sits in front of the radiator. Regardless, high engine temperatures can affect sensors. The knock sensor could have failed due 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