JD95hatch

just did a ZC swap in my 95 dx hatch....after the install i had 0 cels. Today i switched in a p28 ECU cuz i was running my stock p06 for a few days..turned the key and CEL popped up.

I havent yet ran the wiring for vtec so i expected to get cel 21 and 22. Instead i threw a code 41(Primary oxygen sensor heater?) and 21(VTEC spool solenoid valve?) once i wire up vtec i hope to get rid of 21.

can anyone tell me about this 41 code?

murmur9

reset it (ecu) just to get that out of the way...if not..go buy a new one (o2) mine was throwing the same after a swap..just changed it

DREWPY

you can get a 41 from having the wrong o2 sensor .single wire or three wire

articbluedc5

Same prob. I did a ZC vtec swap running on the P28. You need to wire in a 4 wire O2 sensor to kill that code. There are plenty sites like hybrid honda that show you where each wire goes in the ecu. Or you can have your P28 chipped to run off the stock 1 wire

Hit me up on AIM if you have more questions thurgood12

JD95hatch

nice...thanks guys....the ZC i have is SOHC and has a single wire o2 sensor....could i use the one from my d15 with no problems?

articbluedc5

Your using a P28 so you need to wire in a 4 wire , unless you have your ecu chipped