ok i got a 99gsr that i switched over to obd1 with hondata, when i got engine rebuilt... I am pretty sure im in the need of o2 sensors b/c my gas mileage has been bad since b4 the rebuild. I know that only one o2 sensor is functional with obd1, im pretty sure its the rear. So if i want o2 sensors do i need to get both changed, or only one? Thanks for any replies

 

I would change both to be on the safe side ......you can either get oem which is $$$$ or get bousch or ngk which is more reasonable priced

 

OBD1 uses only the Primary sensor

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Spunkster &raquo;</TD></TR><TR><TD CLASS="quote">OBD1 uses only the Primary sensor</TD></TR></TABLE>

good call....didnt think about that...

 

soo i would only need the sensor closer to engine rather than the one closer to the muffler?

 

Primary is the one in front

 

buy yourself a wideband (plx is the easiest Ive found to deal with when running Hondookie) and check your a/f. If your gonna do any serious tuning (which you should on any built motor), the wideband will be a god send. The Primary wideband is the one directly under your intake mani