i have a 94 ex and i had a test pipe on it.. i put the cat on to get it inspected a code 41 popped up.. the o2 sensor was pretty old so i replaced it. the code is still coming up. if the car is cold it comes on but if i let it warm up and turn it off then turn back on it wont come on any one kno wat could cause this

 

Code 41 is for the pre-heater in the O2 sensor. Since you already put a new sensor in, now you should look for wiring problems in that heater circuit.

 

You can click this link;
http://img139.imageshack.us/img139/3...acode41no7.jpg

 

i was looking into my heater circuit prob n i looked at all data and they said the negative wire was org/blk i looked in the haynes manual and they said that it was a grn/blk wire and one ever checked the heater circuit and know which is the real color