first off i have a 88 300se (w126, m103) and was wonder what people are using as the cheapest method to check for codes.. i have no idea if my car is obd I or if its obd II

also is there a way to tune your chip through a laptop ?

is there anything for that matter that i can do with a laptop for this car.. monitor, read, re-program

It's OBD I and no chip tune available, thus, you can't use a computer with it.

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Master Computer Engineer, A+, Network+, MCP/MCSA/MCSE 4/2k/2k3 - Messaging, MCTS, MCITP, MCT, Brainbench, ICDL and starting Ph.D

380SE 1984 <------- Totaled by flipping accident
300SE 1988 <------- Sold
Volvo S70 2000 <---- 4 family
Opel Omega 2002 <-- 4 family
560SEC 1989 <------ Sold
560SEL 1990 <------ Sold
560SEL 1991 <------ 4 my mother
560SEL 1989 <------ Sold
600SEL 1992 <------ Current

http://search.ebay.com/_W0QQsassZkhazenzcc

your thoughts on this ? will it work with any obd-II code reader ?

http://cgi.ebay.com/OBD-II-Interface-Adapter-Mercedes-Benz-38-OBD-OBD-I-2_W0QQitemZ220161213614QQihZ012QQcategoryZ60208QQcmdZViewItem

Unless you convert your mostly mechanical Bosch CIS fuel injection system to a true EFI system, then it's pretty much as "tuned" as it's going to be.