Chevrolet Blazer Oxygen Sensor Replacement at your home or office.

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Oxygen Sensor Replacement Estimate for Chevrolet Blazer

Chevrolet Blazer Oxygen Sensor Replacement costs $123 on average. Following is a breakdown of the labor and parts estimates.

YourMechanic Price
$95 to $181
Labor: $70 -$80
Parts: $25 -$101
Average Dealer price
$143 to 295
Average Shop price
$115 to 210
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
CarServiceYourMechanic PriceShop/Dealer Price
1992 Chevrolet BlazerV8-5.7LService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$120.40Shop/Dealer Price$147.52 - $196.21
1988 Chevrolet BlazerV8-5.7LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementYourMechanic Price$137.52Shop/Dealer Price$168.99 - $230.57
1987 Chevrolet BlazerV8-5.0LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementYourMechanic Price$137.52Shop/Dealer Price$168.94 - $230.49
1991 Chevrolet BlazerV8-5.7LService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$120.40Shop/Dealer Price$147.56 - $196.29
1987 Chevrolet BlazerV8-5.0LService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$137.52Shop/Dealer Price$168.93 - $230.47
1991 Chevrolet BlazerV8-5.7LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementYourMechanic Price$137.52Shop/Dealer Price$168.92 - $230.44
1995 Chevrolet BlazerV6-4.3LService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$206.76Shop/Dealer Price$255.56 - $369.08
1987 Chevrolet BlazerV8-5.7LService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$137.52Shop/Dealer Price$168.99 - $230.56
Show example Chevrolet Blazer 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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Meet some of our expert Chevrolet mechanics

Real customer reviews from Chevrolet owners like you.

659 reviews
Ben
37 years of experience
Did an outstanding job, showed up went to work right away, showed me the parts he replaced and showed me the diagnostic on how things should be working on my truck. GREAT JOB BEN
2003 CHEVROLET SILVERADO 1500 - OXYGEN SENSOR REPLACEMENT (FRONT/UPPER/UPSTREAM, REAR/LOWER/DOWNSTREAM)
449 reviews
Dan
35 years of experience
Just a great person with integrity and morals. Recommend to anyone.
1996 CHEVROLET K1500 - OXYGEN SENSOR REPLACEMENT (FRONT/UPPER/UPSTREAM, REAR/LOWER/DOWNSTREAM)
432 reviews
Jose
13 years of experience
Jose was able to determine that my Blazer's issue WAS related to my engine [as my original mechanic suspected]. That means that the initial mechanic, whom I scheduled through "Your Mechanic," misdiagnosed. He insisted it was the A/C compressor, leaving me hopeful [and paying for a second inspection for work that won't be economical for me to complete]. Jose examined my Blazer like a medical clinician would examine a person. He checked various areas under the hood, using a tool to listen & feel with, while the engine was running. He also had me do the same, so I could understand how he was able to quickly rule out where the problem WASN'T coming from. He determined it was coming from the back of the engine [what I was afraid of, from the start]. So, basically, the first inspection was a bust....which didn't leave me with much confidence in my pre-purchase inspection of the Subaru, done by the same mechanic. It's a shame, because I found him likable and he seemed honest. But I don't feel encouraged to use him again. Additionally, in discussing my friend's Subaru, that I am currently driving, I learned, from Jose, that the timing belt should be given a greater priority status than either of us were giving it. I will have to check with my friend, to be certain; but I will likely want to schedule maintenance with Jose soon. I work nights, but I could schedule in the morning....better yet, on a Thursday or Friday. But, again, I will wait have to wait for approval from the car's true owner [even though I was intending to pay for it, myself].
1998 CHEVROLET BLAZER - OTHER INSPECTIONS
187 reviews
Richard
7 years of experience
This guy is perfect
1994 CHEVROLET BLAZER - FUEL PUMP REPLACEMENT
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
CarServiceYourMechanic PriceShop/Dealer Price
1992 Chevrolet BlazerV8-5.7LService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$120.40Shop/Dealer Price$147.52 - $196.21
1988 Chevrolet BlazerV8-5.7LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementYourMechanic Price$137.52Shop/Dealer Price$168.99 - $230.57
1987 Chevrolet BlazerV8-5.0LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementYourMechanic Price$137.52Shop/Dealer Price$168.94 - $230.49
1991 Chevrolet BlazerV8-5.7LService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$120.40Shop/Dealer Price$147.56 - $196.29
1987 Chevrolet BlazerV8-5.0LService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$137.52Shop/Dealer Price$168.93 - $230.47
1991 Chevrolet BlazerV8-5.7LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementYourMechanic Price$137.52Shop/Dealer Price$168.92 - $230.44
1995 Chevrolet BlazerV6-4.3LService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$206.76Shop/Dealer Price$255.56 - $369.08
1987 Chevrolet BlazerV8-5.7LService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$137.52Shop/Dealer Price$168.99 - $230.56
Show example Chevrolet Blazer Oxygen Sensor Replacement prices

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