CEL 1 and 61 both refer to the O2 sensor in the header but someone told me they are 2 different issues. Can anyone tell me what the differences are? If it helps, I have a DC 4-1 cereamic header. Thanks

 

Code 1 = unplugged/defective circuit
Code 61 = high/low voltage and/or slow response

One code would appear to say "hey, you got no O2 input or the O2 input isn't changing at all"

The other code would appear to say "hey, thanks for providing an O2 input, but there is something up with it - its not switching fast enough and its not responding as I'd [the ECU] expect it to"

When were you getting this code prior to the DC 4-1 install or after the install or did you have the 4-1 installed for quite sometime now and this code was thrown?

 

This was after the install. The header has been on for three weeks. Thanks for the info.