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Originally Posted by carson356
did you see thread #3 above? have you checked that? that is the easiest and from what i have seen in the past in a mercedes repair shop environment that could be your cause. if lambda is full rich or lean, the computer thinks the o2 sensor is shorted to pos or ground and sets a code accordingly. until you check that, you may just be spinning your wheels with all this testing.
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Yes, I did see the post above. Started to search the forum for Lambda testing and found way too much info. I guess I was looking for a simple step-by-step. My multimeter does not have a duty cycle option, so I was reading up on how to do the calculations. If you know of a post that is laid out real well on the subject, let me know.
I needed to replace my rear shocks, so I have been out doing that for now. I will re-address the duty cycle when I get the other shock installed.
Thanks.