I'm wanting to buy a code scanner/reader and the parts store has 2types, one is a new gen CAN BUS and the other is a 1st gen guaranteed only on cars up to 2003, but some had that write code up till 2007. The latter is half the price, and the only reason I ask.

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2005 Black CRD KJ____Full GDE turbo kit, EHM, 6.5L GMCTD lift pump, euro tq conv, 31" Duratracs on 15x7 Procomps w/3.75"bs
2.5" lift, full skids, Super Skink Sliders, front JBA Steel Diff w/True-Trac___Powertax "No-Slip" locker rear
Tow Rig: 2003 Silver 2wd Dodge 2500 reg. cab 5.9 Cummins (highly modded with 550hp/1200tq+)

The CRD is M.I.C.K.E.Y. M.O.U.S.E.... Protocol...

search on Scangauge - basically it started with an ISO 9141 implementation (pretty sure CAN )
but kluged it to avoid spending the money to properly rewrite the code.

http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=11476&p=111997&hilit=scangauge#p111997

only buy things with a good return policy

(Scangauge II works fairly well for about 10-15 minutes and then kicks out - and it you have it on with cruise control - it will kick out of overdrive - unnerving)

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2005 CRD
stuff
Skeptic quod gratis asseritur, gratis negatur