Mercedes-Benz ML430 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

(31)

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

(31)

Oxygen Sensor Replacement Service

How much does a Oxygen Sensor Replacement cost?

On average, the cost for a Mercedes-Benz ML430 Oxygen Sensor Replacement is $417 with $322 for parts and $95 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
2001 Mercedes-Benz ML430V8-4.3LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$877.51Shop/Dealer Price$1085.64 - $1670.66
1999 Mercedes-Benz ML430V8-4.3LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$739.71Shop/Dealer Price$918.42 - $1415.11
2000 Mercedes-Benz ML430V8-4.3LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$739.71Shop/Dealer Price$918.42 - $1415.11
2001 Mercedes-Benz ML430V8-4.3LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$857.51Shop/Dealer Price$1065.63 - $1650.64
1999 Mercedes-Benz ML430V8-4.3LService typeOxygen Sensor - Front/Upper/Upstream ReplacementEstimate$739.71Shop/Dealer Price$918.45 - $1415.16
2000 Mercedes-Benz ML430V8-4.3LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementEstimate$739.71Shop/Dealer Price$918.42 - $1415.11
Show example Mercedes-Benz ML430 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

(31)

Rating Summary
31
0
0
0
0
31
0
0
0
0

Collins

12 years of experience
488 reviews
Collins
12 years of experience
Mercedes-Benz ML430 V8-4.3L - Ignition Cable (Spark plug wires) Replacement - Kennesaw, Georgia
COLLINS was very knowledgeable and worked hard on fixing my car which is now running GREAT!!! I have more work I need to book with YourMechanic and I would like to request COLLINS for all duture work!!!!!

Vadym

6 years of experience
43 reviews
Vadym
6 years of experience
Mercedes-Benz ML430 V8-4.3L - Serpentine/Drive Belt Replacement - Denver, Colorado
Very friendly, knew what he was doing. Got the work done fast and efficiently.

Tomas

17 years of experience
226 reviews
Tomas
17 years of experience
Mercedes-Benz ML430 V8-4.3L - Ignition Coil Replacement - Newark, New Jersey
He is very good and time

Richard

21 years of experience
461 reviews
Richard
21 years of experience
Mercedes-Benz ML430 V8-4.3L - Water Pump (Auxiliary) - Douglasville, Georgia
Richard was excellent and professional. Thanks for great service!

Excellent Rating

(31)

Rating Summary
31
0
0
0
0
31
0
0
0
0
Number of Mercedes-Benz ML430 services completed
341+
services done by our mechanics
TOTAL NUMBER OF EXPERT Mercedes-Benz MECHANICS
1100+
experts on our platform

Recent articles & questions

Symptoms of a Bad or Failing Coolant Level Sensor
If the Coolant Light stays on permanently, there is low coolant, or the engine is overheating, you may have to replace the coolant level sensor.
How Long Does an Evaporator Temperature Sensor (Switch) Last?
If If you have air conditioning in your vehicle, which pretty much all modern vehicles have, then you have an evaporator temperature sensor (switch). This switch plays an important role in making sure the correct temperature is attained, and that...
How to Replace a Refrigerant Pressure Sensor
The air conditioning system has a refrigerant pressure sensor that goes bad when the air conditioning does not work or only works intermittently.

When you start off it bogs down and then takes off?

This sounds like potentially a fuel delivery or air regulation problem. There is a sensor in your truck called a mass air flow sensor (https://www.yourmechanic.com/services/mass-airflow-sensor-replacement) which regulates the flow of air into the engine allowing for the proper air/fuel mixture...

Rough idle when cold

Hello there, thank you for asking about your 1997 BMW 760Li. Your problem has many potential causes. It could be anything from a failed mass airflow sensor to a worn fuel pump. The first step is to retrieve the diagnostic...

Possible timing chain replacement.

The code P0015 (https://www.yourmechanic.com/article/p0015-obd-ii-trouble-code-camshaft-position-b-timing-over-retarded-bank-1-by-jay-safford) could be coming up for the following issues. ____________________________ The camshaft(s) have incorrect timing intake timing control valve control solenoid system has wiring problems Continuous oil flow to the VCT piston chamber The timing valve control...

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