Aurthur, thanks for your reply. I replaced the o2 sensor behind the cat, this is what the book said was malfunctioning per the code on the tester. I checked all my wires and they were fine. I cleared the code after repair and it has been 1 full week and no check engine light. This is the second repair I have done using my scanner and I am amazed at how easy this has been. I am glad I have an MB publication though, the generic publication that came with the scanner really doesn't tell you enough to know exactly what sensor is acting up, so I have been very lucky. 134k miles and still going strong with my 104! Thanks again and I really appreciate you being so helpful to myself and everyone else around here, I have learned so much from this forum.
Brian

__________________
Brian W. Heitman

www.MBCA.org/northtexas

Join MBCA!!!