I have a 2002 honda civic ex coupe bought it with no cat just a piece of flex pipe from header to exhaust pipe the stock converter was located under the car due to the high price of a ca epa approved one a friend of mine had the exact same car but it was a 2001 i was told 2001 to 2005 were all the same so i took off his stock exhaust manifold with an up stream and down stream o2 sensors made a new header pipe to connect to exhaust and lengthened o2 downstream sensor wires started it up check eng light went off about 1 min later came back on bank 1 heated o2 sensor 2 when i scanned it po141 code what do i have to do to remove this code for smog wide ban narrow band ecu any help is appreciated PPPPPPLLLLLLEEEEEEEAAAAAAASSSSSSSSSSSSSEEEEEEEEEEE EEE

 

You're in the wrong forum. 2001-2005 model is considerably different from the 1996-2000 covered here.

As generic advice, throwing the O2 sensor heater code immediately on startup usually means one of the following
- sensor bad -- its heater is open (can be checked with ohmmeter)
- faulty wiring
- blown fuse

 

Pre-face (01-03) and facelift (04-05) civics (EM, ES chassis) are similar but have subtle differences. 01-03 should be the same within their TRIM LEVEL AND CHASSIS. Different D17s used different exhaust setups. I'd go junkyard one.