04-07-2013, 02:45 PM
Join Date: Dec 2011
Location: New Hampshire
Feedback Score: 9 reviews
OBD test only checks your ECU for any recent codes (which is why it didn't pass the first time). Up here, if you reset the ECU before your test, you need to drive it AT LEAST 50-100 miles before the state inspection computer will allow it to pass the OBD test. It may take that long for the ECU to re-test all the components to be sure everything is working properly.
Your emissions test is totally different obviously. It tests the air coming out of the exhaust. What was the "check engine light" code that you got previously? It is very likely an O2 sensor that needs replacement, but could be any number of other parts.
Bring it to an Autozone or car parts store that does the OBD reading for free and find out what the code was, and fix it.
If there is no code at the moment, but you are failing the emission test, your check engine light WILL come back on eventually if you keep driving it... then get it checked by the OBD2 reader and fix it.
Your fan will not cause your car to fail emissions.
Your car would fail regular inspection if there is a leak in your exhaust anywhere.
Check the code when it comes back.
2001 Honda Prelude SH-Joy Rider
1998 Honda Prelude SH-parts car
1998 Honda Prelude SH-Sold
1997 Honda Prelude Base project--Sold
1991 Honda Prelude Si--Sold
1989 Honda Prelude SI AWS--Sold
-Over 20 years of Honda Ownership and Experience with Prelude, Accord, and Civic-