i have a 93 GSR (OBD1)and recently purchased a OBD1 PR3 ecu(DA6 grey plug). i reseted the ecu first before installing the new one......and then i throw codes 41 and 20 now......before i didnt...when i put the gsr p61 stock ecu in, it throws NO codes.

my question is....does the PR3 OBD1 ecu use a different O2 sensor than my GSR vehicle? i have a 4 wire o2 and i was told that the DA6 integra XSI in japan had only 1 O2 sensor wire...is this true????is that why i am throwing these codes? i was thinking that the O2 sensors had a different amps or ohms or whatever?????any light shed on this problem would be MUUUUUCCCCHHHH greatful..the car starts up fine and all but i cant seem to get these damn codes off........

obviously my O2 sensor isnt bad and all other things are in its right place because the stock P61 ecu works fine...

also the reason why i bought an extra ecu is for smog purposes..i was going to get the PR3 chipped and leave the p61 a virgin