The oxygen sensor cable will have one or two clips that hold the O2 sensor wire. Step 5: Remove the oxygen sensor wire from the clips. In some cases, you may see little tabs that you will need to press to be able to unplug the old oxygen cable connector. Separate the electrical connects by pulling it apart. Step 4: Unplug the oxygen sensor electrical connector. Once you remove the undercarriage cover, you should see the oxygen sensors. The engine undercarriage plastic (engine splash shield) is usually held in place with several 8 mm plastic bolts or with push pins. Most modern cars including Mercedes-Benz have a plastic cover that goes under the car. Step 3: Remove the undercarriage to access the Oxygen Sensor. The picture is shown with the engine removed, but you don’t need to do that to replace an O2 sensor ). Look at the picture below to locate the sensor that needs to be replaced. Which sensor would that be? There are usually four oxygen sensors on your Mercedes-Benz. Once you scan your car, you will get a fault code that directs you to the faulty oxygen sensor, for instance, Bank 1 Sensor 2. Step 2: Locate the defective oxygen sensor. You can see an example in the picture below. Your OBD II port where you plug in the scanner is located under the dash, usually right under the steering wheel. Here are the bestseller OBD 2 scanners on Amazon and any of these will work fine. You will need an OBD scanner to get the fault codes. If you have not used an OBD II scanners before it is very easy. Scan your car’s ECU using an OBD 2 scanner. If you are removing the downstream sensor you may be able to get away using a wrench but to remove the upstream sensors you will need oxygen sensor removal tool set. Especially when there is little room between the oxygen sensor and the car frame or the engine. Oxygen Sensor Removal Tool Removing the oxygen sensor from the exhaust pipe can be a challenge. Click here to find the right sensor for you car on Amazon. If you go to Amazon, you will see that new oxygen sensors prices for Mercedes-Benz cars range between $30 to $80. New Oxygen 2 Sensor, which you can purchase online and save a lot. To replace the oxygen sensor (O2) you will need: Here we will show you the steps you need to follow to replace an oxygen sensor successfully. Is you check engine light on because of a bad oxygen sensor? You don’t have to spend your life savings to replace a defective O2 sensor. Step by step instructions on how to change the Oxygen O2 Sensor in your car.
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