Mercury Topaz 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

(8)

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

(8)

Oxygen Sensor Replacement Estimate for Mercury Topaz

Mercury Topaz Oxygen Sensor Replacement costs $206 on average.

CarServiceEstimateShop/Dealer Price
1994 Mercury TopazV6-3.0LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$370.31Shop/Dealer Price$450.29 - $662.33
1992 Mercury TopazL4-2.3LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$207.53Shop/Dealer Price$251.83 - $356.80
1984 Mercury TopazL4-2.3LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$252.71Shop/Dealer Price$308.31 - $447.16
1993 Mercury TopazL4-2.3LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$177.69Shop/Dealer Price$214.51 - $297.08
1985 Mercury TopazL4-2.3LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$526.31Shop/Dealer Price$650.32 - $994.39
1987 Mercury TopazL4-2.3LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$252.71Shop/Dealer Price$308.31 - $447.16
1994 Mercury TopazL4-2.3LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$212.53Shop/Dealer Price$256.70 - $361.56
1990 Mercury TopazL4-2.3LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$531.31Shop/Dealer Price$655.54 - $999.78
Show example Mercury Topaz Oxygen Sensor Replacement prices

Oxygen Sensor Replacement Service

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

(8)

Rating Summary
8
0
0
0
0
8
0
0
0
0

Andrian

32 years of experience
185 reviews
Andrian
32 years of experience
Mercury Topaz L4-2.3L - Battery Cable Replacement (Negative) - Pompano Beach, Florida
A nicer person you could NOT find. Friendly, knowledgeable and timely. Goes the extra mile to make sure the job is done correctly and point out other issues to consider. Would NOT hesitate to book with him for future repairs or recommend to others. If you require auto service - BOOK HIM!!!

Jose

10 years of experience
285 reviews
Jose
10 years of experience
Mercury Topaz L4-2.3L - Car is not starting - Zephyrhills, Florida
Very professional, on time and polite.

Jeffrey

14 years of experience
55 reviews
Jeffrey
14 years of experience
Mercury Milan L4-2.3L - Oxygen Sensor Replacement (Rear/Lower/Downstream) - Smyrna, Georgia
Really good service

Michael

27 years of experience
426 reviews
Michael
27 years of experience
Mercury Mariner L4-2.5L - Oxygen Sensor Replacement (Front/Upper/Upstream, Rear/Lower/Downstream) - Chandler, Arizona
On time and very professional.

Excellent Rating

(8)

Rating Summary
8
0
0
0
0
8
0
0
0
0
Number of Mercury Oxygen Sensor Replacement services completed
88+
services done by our mechanics
TOTAL NUMBER OF EXPERT Mercury MECHANICS
600+
experts on our platform

Recent articles & questions

Symptoms of a Bad or Failing Air Cleaner Temperature Sensor
If your car is having trouble starting in the cold, the Check Engine Light comes on, or idle quality is poor, you may need to replace the ACT sensor.
Symptoms of a Bad or Failing Mass Airflow Sensor
Common signs of problems with a mass airflow sensor include running rich at idle or lean under load, decrease in fuel efficiency, and rough idles.
Symptoms of a Bad or Failing Oxygen Sensor
Common signs of a faulty car oxygen sensor include the Check Engine Light coming on, bad gas mileage, and a rough idle.

Purge flow sensor code

Hi, it is fairly rare for this to happen with a purge flow issue. Purge flow refers to the cars EVAP system. This system collects the fuel that evaporates inside the gas tank to ensure that pretty much 100% of...

My 2007 Grand Caravan hard detonation problem

As you know, a misfire can be caused by many different reasons such as bad spark plugs, spark plug wires, faulty fuel injectors, lack of voltage to fuel injectors, incorrect fuel pressure, an air intake leak and many other possibilities....

Will my car turn on normally again once I fix the crankshaft position sensor?

A faulty crankshaft position sensor could cause hard starting but to determine if the sensor itself is faulty it has to actually be tested. Often, there will be a Diagnostic Trouble Code (DTC), that is generated by the car's computer,...

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