Question about 2000 Mercedes-Benz CLK

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I have a 2000 Mercedes E320 the check egine light came on twice and both times it was for the ox sensor. We have replaced all the sensors and the light came back on. After a scan it is saying that the 2 rear sensors are not working. Is it possible that the sensors are defective or could it be somthing else. The care runs fine

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  • leslie207 May 04, 2010

    I will have the garage vheck the things you mentioned. The sensors were not Bosch but the universal type so it might be a mater of getting new ones. Is there a way to check is the are wroking properly?

  • leslie207 May 04, 2010

    Problem is that the original part is $$ any other recomendations?

  • leslie207 May 04, 2010

    Very informative. Have you ever tried the Borg Warner ones?

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Fault location: Oxygen sensors (O2S) #2, bank 1 (bank placed on right side of the car), and bank 2 (bank placed on left side of the car) - range / performance.
Probable cause: Intake / exhaust leaks, fuel pressure, injectors, bad wiring, bad oxygen sensors plug connexions, bad oxygen sensors (O2S).
So, check first engine air intake system for leaks, fuel pressure - replace fuel filter if necessasy, injectors, exhaust pipes & catalytic converters for leaks, oxygen sensors wiring & plug connexions.
Could be also bad oxygen sensors. Verify if oxygen sensors replaced part number is the same as the original !!!

Posted on May 04, 2010

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  • TDISLine
    TDISLine May 04, 2010

    Yes, but this oxygen sensors checking procedure needs a diagnostic scantool equiped with an oscilloscope. Sometimes universal type oxygen sensors are not correctly seted with engine requirements! I recommend you original type Bosch sensors.

  • TDISLine
    TDISLine May 04, 2010

    Walker Products Oxygen Sensor -- WALKER PRODUCTS OXYGEN SENSOR, 4-WIRE -- A high quality, direct fit OE replacement oxygen sensor; Improves car's engine response and gas mileage; Effectively lowers emissions upon replacing its tired old oxygen sensor; Exceeds OE specifications and test requirements; OE part number 5408117.

    Notes AfterCatalytic Converter




    Type

    : Direct OE Replacement, 4-wire, Heated









  • TDISLine
    TDISLine May 04, 2010

    Bosch oxygen sensor








  • TDISLine
    TDISLine May 04, 2010

    The oxygen sensor is one of the only sensors that can indicate a problem without a failure in the sensor. Most all of the other sensors on the vehicle either work or they don't, and a "Check Engine" light with a corresponding code for that sensor usually means a failure.

  • An oxygen sensor measures the amount of oxygen present in the exhaust system in real time. Too much oxygen in the exhaust gives a signal for a mixture that is too lean, and the reverse for too little oxygen. Any time that the sensor indicates one of these conditions, the "Check Engine" light will come on and produce a code (for example--oxygen sensor bank 1 sensor 2: O2-B1-S2). It will say "Out of Range." Before a definitive answer can be given as to the functioning of the sensor, the engine management system should be checked first. This will include the ignition system, from crank sensor to spark plug, and everything in between--the throttle body for coking, PCV valve, air cleaner, fuel injectors, timing, coolant temperature, fuel pressure, valve timing, vacuum leaks and the emission system as well. If all of this is up to par, it's a safe bet the sensor is faulty.
  • There are some basic tools needed to complete this job. You will also need a special 7/8-inch oxygen sensor socket with a relief for the electrical harness, and an OBD code reader.
  • Connect the code reader to the OBD II port under the driver's side dash and turn the key to the "On" position with the engine off. Push the button for READ, and the code reader will interrogate the computer and render a code. Cross-reference the code with the interpretation of the code on the sheet that came with the tool. It will say which sensor is bad. Most Mercedes have four sensors, so the correct one is essential.
  • Turn off the key, raise the car and support it with jack stands. Disconnect the proper oxygen sensor wiring harness connector. Use either the wrench or the socket, whichever one fits best, and remove the sensor. Before installing the new sensor, put some anti-seize on the threads so it will come out in the future. Install the oxygen sensor and connect the wiring harness. Lower the car and turn the key once more to the "On" position. This time, push the "Clear Codes" button on the code reader and it will reset itself and turn off the engine light.

  • TDISLine
    TDISLine May 04, 2010

    Yes, very good !!!

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