I have no idea if my car is OBD 2a or OBD 2b!!

I have a 98 Honda Civic Ex coupe manual trans and single o2 sensor if that helps.

Does anyone have any idea?? thanx

 

You're OBD2a. 99% certain that civics are 2a until either 99 or 00, and integras are 2a until 01.

 

your supposed to have 2 02 sensors,
your obd2a

 

I though so too but I wasn't sure.

 

I only have one o2 sensor is this bad?? I bought it from a dealer in San Diego, Ca and it came with a smog certificate.

Does anyone else have any idea??

 

Thanks guys but I still need to be sure before I go ahead and buy an engine harness.

 

if you want to be 100% sure look at the ECU plugs, that tells you everything. OBD2 WILL have 2 o2 sensors. basically if there's 3 rows of pins, you have OBD2, 2 rows, OBD1

here, read up on youre ECUs:
http://wikitest.pgmfi.org/twiki/bin/...ry/WireHarness

i couldnt find those pics here on HT, search is pretty much useless for looking up OBDxx so i appologize if thats a nono.

 

I have a D16Y8 so it has to be a OBD2B with the link you just provided thanks

 

Civics:
OBD2A -> '96 - '98
OBD2B -> '99 - '00

Integras:
OBD2A -> '96 - '99
OBD2B -> '00 - '01

*Notes*
-HX Civic coupes remained OBD2 for the entire production run
-Most JDM OBD2 ECUs remained OBD2A For the Entire production run. CTR ECUs being a notable exception.

 

Nice!! great info thanks

 

is it mandatory to have 2 o2 sensor. to which one do i install the air/fuel ratio...

 

im not possitive if its mandatory, but if your trying to pass emissions then yea, obd2 civics have 2 o2s in them from honda,
im not 100% positive on this but the top. just check with a shop.