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Ok, i'm not very good with electronics. I just wanted to know if the D16a6 from the '90 Si was an OBD 1 or OBD 0. And what are the differences? Thanks.
 

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not sure on the differences off hand but your rex has the obd0

for themost part that i know the obd1s are on vtec motors
 

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All 88-91 civics, crx's and hatches are obd-0

Pre 92 hondas are obd-0, including the pre 92 VTEC engines. OBD has nothing to do with vtec.

From what Ive read on the codes, the OBD-0 systems are very basic. For example our crx's codes are pretty simple, code 1, 2, 3 and so on representing where the problem is. Here is a LINK to codes for our obd-0 cars. Pretty basic info.

OBD-1 and 2 are far more advanced. Instead of a basic idea of the problem you can get codes for a misfire in a particular cylinder, or voltage in a circuit being to high or low, so its a little more detailed.

Heres a LINK scroll down a little and you'll see a list of obd-1 and 2 codes
 
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