Cadillac Seville 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

(102)

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

(102)

Oxygen Sensor Replacement Service

How much does a Oxygen Sensor Replacement cost?

On average, the cost for a Cadillac Seville Oxygen Sensor Replacement is $30 with $30 for parts and $0 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
2000 Cadillac SevilleV8-4.6LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$297.72Shop/Dealer Price$372.15 - $595.44
2003 Cadillac SevilleV8-4.6LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$326.12Shop/Dealer Price$407.65 - $652.24
1993 Cadillac SevilleV8-4.9LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$179.68Shop/Dealer Price$224.60 - $359.36
1999 Cadillac SevilleV8-4.6LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$238.04Shop/Dealer Price$297.55 - $476.08
2004 Cadillac SevilleV8-4.6LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$276.12Shop/Dealer Price$345.15 - $552.24
1996 Cadillac SevilleV8-4.6LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$213.36Shop/Dealer Price$266.70 - $426.72
1999 Cadillac SevilleV8-4.6LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$213.36Shop/Dealer Price$266.70 - $426.72
1996 Cadillac SevilleV8-4.6LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$238.04Shop/Dealer Price$297.55 - $476.08
Show example Cadillac Seville 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 Cadillac mechanics

Real customer reviews from Cadillac owners like you.

Excellent Rating

(102)

Rating Summary
96
4
0
0
2
96
4
0
0
2

Desmond

18 years of experience
36 reviews
Desmond
18 years of experience
Seville 1996 - Car is not starting - Salinas, CA
Desmond was knowledgeable and quick to evaluate my cars trouble . I’m already making plans for further work on all my cars. He’s great

Raymond

25 years of experience
137 reviews
Raymond
25 years of experience
Seville 2003 - Strut Assembly - Hesperia, CA
Very professional and knowledgeable!

Corey

15 years of experience
184 reviews
Corey
15 years of experience
Seville 1997 - Serpentine/Drive Belt - Fort Mill, SC
Very professional technician and courteous. Due to COVID19 Mr Trent wore mask and gloves. Replaced my Serpentine belt in no time and made sure it was secure. Check tensioner but it was ok and didn't need service. Thanks Corey will use again.

Kenneth

6 years of experience
808 reviews
Kenneth
6 years of experience
Seville 2003 - Tune-up - Los Angeles, CA
Knows his job and experience.

Excellent Rating

(102)

Rating Summary
96
4
0
0
2
96
4
0
0
2
Number of Cadillac Seville services completed
1122+
services done by our mechanics
TOTAL NUMBER OF EXPERT Cadillac MECHANICS
1000+
experts on our platform

Recent articles & questions

Symptoms of a Bad or Failing Injector Control Pressure Sensor
Common signs include starting issues, engine misfires, the Check Engine Light coming on, and a decrease in power, acceleration, and fuel economy.
Symptoms of a Bad or Failing ABS Speed Sensor
Common signs include the ABS Light coming on, decreased stopping time, and less stability under icy or wet driving conditions.
How Long Does an EGR Pressure Feedback Sensor Last?
In In today's world people are more aware of exhaust gases than ever before. With that said measures have been built into modern vehicles that are meant to cut down on the emissions released into the air. Built into your...

Where is the camshaft sensor located on a 2007 Corolla?

Hi there - with the hood open, face the "nose" of the engine (accessory belt end) from the passenger side of the vehicle. The cam position sensor (https://www.yourmechanic.com/article/how-long-does-a-camshaft-position-sensor-last) is behind the timing belt cover on the "nose" of the engine,...

Fuel tank pressure sensor is bad. How do I check it?

Test the fuel rail pressure sensor, using a digital volt ohmmeter, as the engine is running. The meter should have a reading of 5-volts. If there is a 5 volt reading, then check the ground wire for a low resistance....

Where is the crankshaft position sensor located at on 2002 nissan frontier 3.3l v6 truck?

Hello. The crankshaft position sensor is located at the driver side rear of the engine in the transmission bell housing. That is where the sensor takes it reading from. If you decide you need some help with it, consider YourMechanic,...

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