Mercedes-Benz ML550 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

(26)

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

(26)

Oxygen Sensor Replacement Service

How much does a Oxygen Sensor Replacement cost?

On average, the cost for a Mercedes-Benz ML550 Oxygen Sensor Replacement is $447 with $307 for parts and $140 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
2008 Mercedes-Benz ML550V8-5.5LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$1456.12Shop/Dealer Price$1761.74 - $2653.09
2010 Mercedes-Benz ML550V8-5.5LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$1439.90Shop/Dealer Price$1739.96 - $2627.13
2014 Mercedes-Benz ML550V8-4.7L TurboService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$894.79Shop/Dealer Price$1083.85 - $1646.84
2015 Mercedes-Benz ML550V8-4.7L TurboService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$760.23Shop/Dealer Price$915.65 - $1377.72
2009 Mercedes-Benz ML550V8-5.5LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$2157.63Shop/Dealer Price$2666.37 - $4179.47
2009 Mercedes-Benz ML550V8-5.5LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$1439.90Shop/Dealer Price$1740.48 - $2628.04
2013 Mercedes-Benz ML550V8-4.7L TurboService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$894.79Shop/Dealer Price$1083.86 - $1646.87
2011 Mercedes-Benz ML550V8-5.5LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$1439.90Shop/Dealer Price$1740.03 - $2627.26
Show example Mercedes-Benz ML550 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

(26)

Rating Summary
24
2
0
0
0
24
2
0
0
0

Chris

23 years of experience
2372 reviews
Chris
23 years of experience
Mercedes-Benz ML550 V8-5.5L - Brake Pads Replacement (Front) - Ladera Ranch, California
Chris got the job done quickly. Fast and efficient service!

Chris

23 years of experience
2372 reviews
Chris
23 years of experience
Mercedes-Benz ML550 V8-4.7L Turbo - Oil Change - Santa Ana, California
Great work and wore PPE to safeguard environment

Manuel

33 years of experience
590 reviews
Manuel
33 years of experience
Mercedes-Benz ML550 V8-5.5L - Brake Pads Replacement (Front) - Dana Point, California
Manuel was awesome. Showed up on time and was outstanding making sure he kept everything clean while installing new rotors and breaks. He went over everything with me and no doubt I will request him again for my next service

James

31 years of experience
1039 reviews
James
31 years of experience
Mercedes-Benz ML550 V8-4.6L Turbo - Car is not starting - Orlando, Florida
Great work done. Fast and professionally.

Excellent Rating

(26)

Rating Summary
24
2
0
0
0
24
2
0
0
0
Number of Mercedes-Benz ML550 services completed
286+
services done by our mechanics
TOTAL NUMBER OF EXPERT Mercedes-Benz MECHANICS
1100+
experts on our platform

Recent articles & questions

How Long Does a Cylinder Head Temperature Sensor Last?
The The engine’s performance is largely based on temperature measurements performed by the engine control module (ECM), also known as the vehicle’s computer. As the temperature of the engine increases, the resistance decreases which means the voltage drops. The computer...
How to Replace a Washer Fluid Level Switch
The washer fluid level switch fails when the Windshield Fluid Warning Light stays illuminated or there are unusual noises coming from the washer pump.
How to Replace an AC Evaporator Sensor
The air conditioning pressure evaporator sensor monitors and adapts to the evaporator's temperature, preventing damage and keeping the AC working.

Temp gauge goes up and down

Hi there. The temperature sensor is the device used to determine the estimated engine coolant temperature reading. The sensor itself is not always perfect. This device sends a signal to the computer and in some cases, the instrument cluster as...

AC compressor only engages around 40% of the time

This is likely due to a faulty thermostat sensor (https://www.yourmechanic.com/services/thermostat-replacement) which is responsible for controlling the temperature at which the AC compressor comes on. To determine this will require a series of tests. I would recommend having an expert from...

Fixed crank shaft position sensor and engine light still on 2001 BMW 325i

Hi there - there are a couple of possibilities. First off, the new crankshaft position sensor (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-crankshaft-position-sensor) (CPS) could be faulty - not all replacement parts are reliable. Second - there could be a problem with the wiring for the...

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