Keydet08

I just replaced the engine wiring harness on my 99 accord 2.3 vtec 175k miles and the p1166 and p1167 codes have popped up. I replaced both o2 sensors 25,000 miles ago so i believe that the o2 sensors are still ok. I have rechecked all of the harness connections around the intake manifold and they are all plugged in all the way, i have also rechecked the connections to the engine computer in the passenger area. If anyone knows what to do next i would appreciate the help. Thanks...

Stashu915

p1166 is a heater circiut dtc. my first step would be to check the fuse(yes, there is a fuse for the heater circuit). The fuse is Fuse number 6 in the passenger side under-dash fusebox. it will be labeled LAF HEATER. try that, if that doesn't work I can try to help you diag the problem further

Duane_in_Japan

Ohm the heater circuits, this will test the wires and the heater. Also make sure that the old wires match the new wires for your swap.