Mercedes-Benz 300SL 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

(6)

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

(6)

Oxygen Sensor Replacement Service

How much does a Oxygen Sensor Replacement cost?

On average, the cost for a Mercedes-Benz 300SL Oxygen Sensor Replacement is $295 with $155 for parts and $140 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
1993 Mercedes-Benz 300SLL6-3.0LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$851.36Shop/Dealer Price$1031.75 - $1558.75
1992 Mercedes-Benz 300SLL6-3.0LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$842.35Shop/Dealer Price$1019.65 - $1544.33
1991 Mercedes-Benz 300SLL6-3.0LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$456.35Shop/Dealer Price$537.19 - $772.40
1990 Mercedes-Benz 300SLL6-3.0LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$494.17Shop/Dealer Price$584.47 - $848.04
1992 Mercedes-Benz 300SLL6-3.0LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$766.71Shop/Dealer Price$927.72 - $1397.63
1993 Mercedes-Benz 300SLL6-3.0LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$766.71Shop/Dealer Price$925.39 - $1393.55
1990 Mercedes-Benz 300SLL6-3.0LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$456.35Shop/Dealer Price$537.22 - $772.45
1991 Mercedes-Benz 300SLL6-3.0LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$494.17Shop/Dealer Price$584.47 - $848.04
Show example Mercedes-Benz 300SL 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 Mercedes-Benz mechanics

Real customer reviews from Mercedes-Benz owners like you.

Excellent Rating

(6)

Rating Summary
5
1
0
0
0
5
1
0
0
0

Chris

23 years of experience
2372 reviews
Chris
23 years of experience
Mercedes-Benz 300SL L6-3.0L - Car is not starting - San Clemente, California
Very happy to have found Your Mechanic. Easy to use, quick appointment set, knowledgeable mechanics. Will definitely use again if needed.

Mike

27 years of experience
265 reviews
Mike
27 years of experience
Mercedes-Benz 300SL L6-3.0L - Air Filter - Westland, Michigan
Terrific professional, he exceeded my expectations!

Tien

24 years of experience
903 reviews
Tien
24 years of experience
Mercedes-Benz 300SL L6-3.0L - Car is not starting - Fremont, California
Satisfied

Edward

43 years of experience
64 reviews
Edward
43 years of experience
Mercedes-Benz 300SL L6-3.0L - power steering leak - Glendale, Arizona

Excellent Rating

(6)

Rating Summary
5
1
0
0
0
5
1
0
0
0
Number of Mercedes-Benz 300SL services completed
66+
services done by our mechanics
TOTAL NUMBER OF EXPERT Mercedes-Benz MECHANICS
1100+
experts on our platform

Recent articles & questions

How to Replace a Fuel Gauge Sender
The fuel gauge has a sender that goes bad when it says that the fuel level is different lower or higher than it actually is.
Symptoms of a Bad or Failing Speedometer Cable
Common signs include the speedometer needle wavering or not moving, squealing noises behind the dashboard, and the Check Engine Light coming on.
Symptoms of a Bad or Failing Crankshaft Position Sensor
Common signs of a faulty crankshaft position sensor include issues starting the vehicle, intermittent stalling, and the Check Engine Light coming on.

Car shifting high when foot on gas pedal

Transmission sensors are usually just to measure vehicle speed and sometimes rpm. I would think that a hydraulic or mechanical  transmission issue would be a more likely cause considering the symptoms. I would first start by checking the transmission fluid...

Fans aren't spinning

If the fans were working before the radiator replacement, it's possible a temperature sensor and/or wire were left disconnected or damaged. The O2 sensor (https://www.yourmechanic.com/services/oxygen-sensor-replacement) should not be unplugged but may not be the cause of the fans not working....

I put a engine out of a 2007 malibu in the 2005 cobolt. Why will the engine not start

Hi there. Check all of the sensors to the engine and make sure that all of them are connected. Check the computer and see if there is an wires disconnected to it. A loose wire on any electrical system will...

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