Mercury Cougar 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

(81)

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

(81)

Oxygen Sensor Replacement Service

How much does a Oxygen Sensor Replacement cost?

On average, the cost for a Mercury Cougar Oxygen Sensor Replacement is $185 with $45 for parts and $140 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
2002 Mercury CougarV6-2.5LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$495.60Shop/Dealer Price$584.35 - $842.50
1993 Mercury CougarV8-5.0LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$374.15Shop/Dealer Price$433.02 - $605.52
1994 Mercury CougarV6-3.8LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$394.83Shop/Dealer Price$448.50 - $604.10
1999 Mercury CougarL4-2.0LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$339.13Shop/Dealer Price$389.27 - $535.52
1994 Mercury CougarV6-3.8LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$417.95Shop/Dealer Price$479.32 - $653.69
1991 Mercury CougarV8-5.0LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$260.07Shop/Dealer Price$290.59 - $377.65
1999 Mercury CougarL4-2.0LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$248.51Shop/Dealer Price$276.01 - $354.31
1994 Mercury CougarV8-4.6LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$409.11Shop/Dealer Price$476.75 - $675.48
Show example Mercury Cougar 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

(81)

Rating Summary
72
6
2
0
1
72
6
2
0
1

David

22 years of experience
107 reviews
David
22 years of experience
Mercury Cougar V6-2.5L - Oil Change - Parker, Colorado
My family thought this might be a scam because it's so cheap or at best it was one of those monthy fee places. I was more than happy to relay to them that it was in fact and legit and am gladly showing my bill to them now and they are all getying ready to try it out as well for their cars. Thanks for the good work guys!!!

Robert

28 years of experience
333 reviews
Robert
28 years of experience
Mercury Cougar * - Car is not starting - Washington, District of Columbia
Robert was very diligent and ensure that the problem was accurately assessed.

Jordan

9 years of experience
144 reviews
Jordan
9 years of experience
Mercury Cougar V6-2.5L - Brake Pads Replacement (Front) - Loughman, Florida
Jordan was very efficient and knowledgeable

Armando

11 years of experience
37 reviews
Armando
11 years of experience
Mercury Cougar V6-2.5L - Pre-purchase Car Inspection - Miami, Florida
he was very informative, helpful, and very professional.

Excellent Rating

(81)

Rating Summary
72
6
2
0
1
72
6
2
0
1
Number of Mercury Cougar services completed
891+
services done by our mechanics
TOTAL NUMBER OF EXPERT Mercury MECHANICS
600+
experts on our platform

Recent articles & questions

How Long Does an Electronic Spark Control Last?
The The job of the electronic spark control is to control the engine timing. This part can also be called the "knock sensor", as it monitors any unusual knocking, or vibration that may be happening in the engine. This is...
How to Replace a Manifold Temperature Sensor
Signs of a failing manifold temperature sensor include rough idling and a rough running engine, and may result in a failed emissions test.
How Long Does a Manifold Temperature Sensor Last?
Keeping Keeping a car running at peak condition is a lot harder that most people think. The engine of a car is a very complicated piece of machinery that has just the right amount of fuel and air to run...

What can happen without using my fuel rail pressure sensor?

The fuel rail pressure sensor is used by the computer to regulate the fuel pressure by regulating the voltage to the fuel pump to slow it down or speed it up. If the pressure switch is bad then the computer...

Engine seems like it's out of time

Hello, thanks for writing in. It is surprising to me that there are no codes stored. Nonetheless, I suspect your timing chain (https://www.yourmechanic.com/services/timing-chain-replacement) and gear set are worn sufficiently that the timing chain has jumped one or more teeth, and...

Valvetronic operation on N42 engine.

The valvetronic motor is stuck or not functioning properly and causing the engine to not start up. I recommend replacing the valvetronic motor. The motor is designed to cycle itself when turning on the ignition, so it is good 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