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question i have a 94 blazer 6.5l with the throttle position sensor on it i was just wondering how can a tell the difference between obd-1 and obd-2 don't they look a like?
 

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Being a 94 I am almost positive it as an OBD I. You can read the codes using a paperclip if it is. There is a thread about that in stickys if you want to know.

Jacob
 

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up to 95 is OBD-I, 96-up is OBD-II
 
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