Will this scanner work for my 2005e320 cdi, and is it the best choice? Basically I want to be able to know what's up; if every things ok and if not what the problem is so I can decide whether I can handle it.
I also want to know if my 97e320 will pass smog and if not why not. It's $70 at the station just to find out. The scanner is $160 on Amazon.

They have customer service.

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'84 300SD sold
124.128

Yes, it's a great scanner. Lots of bang for the buck. Has all the OBD2 functionality plus lots that's specific to your CDI. On your 97 it will function simply as OBD2.

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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles
06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

Thanks, I'll do it.