Mercury Grand Marquis 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

(357)

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

(357)

Oxygen Sensor Replacement Service

How much does a Oxygen Sensor Replacement cost?

On average, the cost for a Mercury Grand Marquis Oxygen Sensor Replacement is $183 with $43 for parts and $140 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
1997 Mercury Grand MarquisV8-4.6LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$360.04Shop/Dealer Price$414.90 - $571.38
2004 Mercury Grand MarquisV8-4.6LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$486.59Shop/Dealer Price$573.57 - $830.40
2000 Mercury Grand MarquisV8-4.6LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$486.59Shop/Dealer Price$573.60 - $830.44
2003 Mercury Grand MarquisV8-4.6LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$374.15Shop/Dealer Price$433.05 - $605.56
2008 Mercury Grand MarquisV8-4.6LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$374.15Shop/Dealer Price$434.52 - $608.14
2001 Mercury Grand MarquisV8-4.6LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$486.59Shop/Dealer Price$573.74 - $830.69
2009 Mercury Grand MarquisV8-4.6LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$461.07Shop/Dealer Price$541.71 - $779.43
1992 Mercury Grand MarquisV8-4.6LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$394.83Shop/Dealer Price$448.50 - $604.09
Show example Mercury Grand Marquis 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 Mercury mechanics

Real customer reviews from Mercury owners like you.

Excellent Rating

(357)

Rating Summary
336
12
3
2
4
336
12
3
2
4

Chris

10 years of experience
31 reviews
Chris
10 years of experience
Grand Marquis 2002 - Tie Rod End - Salt Lake City, UT
Doesn't leave work unfinished, in my case he had to go get a part and a specific tool to finish thhe job.

Chris

10 years of experience
31 reviews
Chris
10 years of experience
Grand Marquis 2002 - Brake Pads - Salt Lake City, UT
Very thorough. Nice guy, does good work.

Jason

0 years of experience
417 reviews
Jason
0 years of experience
Grand Marquis 2001 - Air Spring Bag - Phoenix, AZ
came and took care of problem great guy

LAVELL

26 years of experience
129 reviews
LAVELL
26 years of experience
Grand Marquis 2001 - Check Engine Light is on - Oakland, CA
I was pleasantly surprised he was able to show up early. I wish I could figure out what the problem is, but he told me not to worry much and call for an appt if the light comes on again.

Excellent Rating

(357)

Rating Summary
336
12
3
2
4
336
12
3
2
4
Number of Mercury Grand Marquis services completed
3927+
services done by our mechanics
TOTAL NUMBER OF EXPERT Mercury MECHANICS
600+
experts on our platform

Recent articles & questions

How to Replace a Steering Angle Sensor
A steering angle sensor fails if the Traction Control Light illuminates, the steering wheel feels loose, or the vehicle drives differently.
3 Bad Transmission Speed Sensor Symptoms
Discover symptoms of a bad transmission speed sensor to prevent unexpected breakdowns and keep your vehicle's performance in check with YourMechanic.
How Long Does an Air Cleaner Temperature Sensor Last?
An An air cleaner temperature sensor is not overly common on newer vehicles. This is because in order to ensure that your car engine operates the way it should, several electronic sensors may actually be needed. However, if you drive...

Check Engine light comes on when cars RPMS go over 4000 error code P0344

Hi there. This code is for a bad camshaft sensor (https://www.yourmechanic.com/services/camshaft-position-sensor-replacement). It can be caused by a bad sensor or it can come from another issue. I usually check the sensor first and then I check the timing belt (https://www.yourmechanic.com/services/timing-belt-replacement)....

Acceleration malfunction

If the car is missing an oxygen sensor, this needs to be addressed first. This can cause the computers to do all sorts of strange things. The PCM uses the O2 sensor to make most decisions for your car to...

Speedometer stopped working, how do I repair it? 2003 Audi A6

Hello - most likely the speedometer sensor (https://www.yourmechanic.com/article/how-long-does-a-speedometer-sensor-last) has failed, or the wiring to it has become disconnected. Check that first. It's also possible that the speedometer sensor drive gear has failed (small plastic gear), or the instrument panel speedo...

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 (844) 997-3624 · hi@yourmechanic.com