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Can somebody please summarize the pros and cons (or go into full detail) the differences between '95 & earlier TT's and '96 & later TT's in regards to the On Board Diagnostic I & II Systems? Thanks.
 

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http://www.obdii.com/background.html

http://www.mkiv.com/techarticles/obd2_code_eliminator_after_removing_vsvs/index.html

from mkiv.com
15. is any year supra more desirable than others?
not really. 93-95 are more desirable to some because their obd1 ecus are more friendly to ecu upgrades. 96-98 obd2 ecus can be quite useful in logging obd2 engine parameters and more useful error codes although they generate errors if the cats are removed unless an o2 sensor simulator circuit is installed. other than that, there are only minor differences between the model years.
 
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Ranger498 said:
http://www.obdii.com/background.html

http://www.mkiv.com/techarticles/obd2_code_eliminator_after_removing_vsvs/index.html

from mkiv.com
15. is any year supra more desirable than others?
not really. 93-95 are more desirable to some because their obd1 ecus are more friendly to ecu upgrades. 96-98 obd2 ecus can be quite useful in logging obd2 engine parameters and more useful error codes although they generate errors if the cats are removed unless an o2 sensor simulator circuit is installed. other than that, there are only minor differences between the model years.
Probably doesn't really matter anymore now that they have the AEM ecu.
 
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