i have 96 ek hatch with usdm 97 gsr swap . I have cel 65 code secondary o2 sensor. All the wires are connected properly,sensor was replaced also and still code 65. I need to bar this damn thing. Please help. We weld the o2 bung on the piping after the cat and still cel. But when i put the obd1 p72 gsr ecu back on no cel, but goes back on with the obd2 p72

 

help secondary o2 sensor is giving me a headache with the p72 obd2a ecu

 

With the obd2 ecu it looks for the secondary o2 sensor, with the obd1 ecu it only looks for the first o2 sensor, that's why it's not giving u the code with the obd1 one. Try checking the wires, make sure their going to the right ecu pinouts and check for connectivity, that should help u find ur problem.

 

we did check the wires and secondary o2 sensor is plugged in. blue goes to blue green goest to green and the 2 black goes to 2 black. What could be problem?

 

try swapping the black wires around

 

really i didnt try swapping black wires. I just wanna make sure we had to extend the wires right for the secondary o2 sensor? Since its swapped on ek hatch?

 

hey honda parts /Are your obd2 o2 sensor harness already extended? Can i used it on my 96 ek with 97 gsr swap. Im pullling secondary o2 sensor cel code > maybe my wires are messd up when they extended them. Could i just used my secondary gsr o2 sensor heater plug and cut that and solder that into your harness you sell? What color are the 4 wires?

 

I can make it as long as you need, also if you buy the obd2 harness just make a note and instead of the harness I can just send you an extender harness for it, I just mailed one out for a guy yesterday

 

actually check my site i just added an extension harness to my listings