Is it 1 or 2?
I have a B18B1 running OBD-0 and a 1 wire o2 sensor I have is before the cata. Since wires were cut before I worked on it, what ecu pin out would the o2 hook up to?

 

I think the b18a1 has a single o2 sensor because I bought a DC sport header and it only had one bung.

 

Was it on the bottom of the header, or the side top of the part where it connects with the collector?.

 

What is a collector? I got it figured out..thanx

 

obd-1 = 1 obd-2 =2 obd-0 = 1 as well

 

The one on the top right looks sorta like my header (b18a1) except mine is two piece instead of one, and you can see where the bung is for the o2 sensor.

 

Yeah ronin150, thats the kinda header i need, with the 02 sensor bung at the end of the downpipe, i don't have one up top i don't think.

 

Many ppl say OBD-1 & 2 are similar and OBD-0 is on its own.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by som1_2race &raquo;</TD></TR><TR><TD CLASS="quote">Many ppl say OBD-1 & 2 are similar and OBD-0 is on its own.</TD></TR></TABLE>

did you even read Audi A4's post?

 

its on top of the pipe and there is only one