Oxygen Sensor Replacement at your home or office.

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Oxygen Sensor Replacement Estimate for Mercury Marquis

Mercury Marquis Oxygen Sensor Replacement costs $148 on average. Following is a breakdown of the labor and parts estimates.

YourMechanic Price
$105 to $224
Labor: $70 -$160
Parts: $35 -$64
Average Dealer price
$163 to 315
Average Shop price
$127 to 247
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
1985 Mercury MarquisV8-5.0LService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$107.60Shop/Dealer Price$131.52 - $170.60
1986 Mercury MarquisV6-3.8LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementYourMechanic Price$208.09Shop/Dealer Price$254.30 - $327.25
1985 Mercury MarquisV6-3.8LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementYourMechanic Price$208.09Shop/Dealer Price$254.21 - $327.09
1986 Mercury MarquisV6-3.8LService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$176.90Shop/Dealer Price$215.26 - $264.78
1985 Mercury MarquisL4-2.3LService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$107.60Shop/Dealer Price$131.53 - $170.62
1986 Mercury MarquisL4-2.3LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementYourMechanic Price$139.38Shop/Dealer Price$171.24 - $234.16
1985 Mercury MarquisV6-3.8LService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$177.77Shop/Dealer Price$216.43 - $266.66
1985 Mercury MarquisL4-2.3LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementYourMechanic Price$138.09Shop/Dealer Price$169.70 - $231.71
Show example Mercury Marquis 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 Mercury mechanics

Real customer reviews from Mercury owners like you.

450 reviews
Ben
36 years of experience
I tried another mobile mechanic service, and that mechanic told me that I had a blown head gasket, and the repairs would run $1,300! Within 20 minutes Ben found the problem and had my vehicle running...all it was is the rotor button screw had come loose and the rotor was not engaging. So $70 vs $1300! Needless to say, I'm a VERY happy camper! So many people today will try to take advantage of seniors, especially if they are on disability. But the honesty and integrity of this company is par excel lance! I would encourage anyone to use this service, instead of going to a shop or trusting shady backyard mechanics!
1999 MERCURY VILLAGER - CAR IS NOT STARTING INSPECTION
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274 reviews
Noe
31 years of experience
Did a good job on my car,told what else hD to be done,i got it fixex and it runs great now.
1990 MERCURY SABLE - CAR STARTER REPAIR
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249 reviews
Russell
19 years of experience
Loved Russell. He was polite, and got the job done.
2005 MERCURY SABLE - INTAKE MANIFOLD GASKETS REPLACEMENT
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37 reviews
Matthew
12 years of experience
On time ..and very competent...was finished in little less than one hour...I think I'm hooked...this was 1st time I used this service
1997 MERCURY GRAND MARQUIS - ALTERNATOR REPAIR
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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
1985 Mercury MarquisV8-5.0LService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$107.60Shop/Dealer Price$131.52 - $170.60
1986 Mercury MarquisV6-3.8LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementYourMechanic Price$208.09Shop/Dealer Price$254.30 - $327.25
1985 Mercury MarquisV6-3.8LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementYourMechanic Price$208.09Shop/Dealer Price$254.21 - $327.09
1986 Mercury MarquisV6-3.8LService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$176.90Shop/Dealer Price$215.26 - $264.78
1985 Mercury MarquisL4-2.3LService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$107.60Shop/Dealer Price$131.53 - $170.62
1986 Mercury MarquisL4-2.3LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementYourMechanic Price$139.38Shop/Dealer Price$171.24 - $234.16
1985 Mercury MarquisV6-3.8LService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$177.77Shop/Dealer Price$216.43 - $266.66
1985 Mercury MarquisL4-2.3LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementYourMechanic Price$138.09Shop/Dealer Price$169.70 - $231.71
Show example Mercury Marquis Oxygen Sensor Replacement prices

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