P0135 Heater Circuit Help! PLEASE!

[midnight_accord]

allright listen. i know a good amount about my accord. i have a 1999 honda accord lx. im on my 2nd motor which is the ulev motor and 3rd tranny which i recently just conversted from A/T to M/T. ok. now. i have one lkast code left onmy car everything else is good.

its p0135 primary 02 sensor heater circuit malfunction.

-i replaced the sensors with honda denso parts from dealer. made for my ulev motor.

-i checked the fuse and relay which both are good.

-i checked continuity under the hood to pin 4 which is the white wire under the hood.

i cant figure it out any help at all would be great thanks

[somick]

In my codes library it just says an O2 sensor. Is there any reason you decided that this was a primary?
I would probe the secondary (after catalytic converter) one. If it proves to be good I guess you need to check the ECU pin outs, according to the electrical diagram, which I unfortunately do not have.

Good luck,

Sam