Need help with intermittent codes/warm start issue

[whyzee125]

It sounds like an intermittent connection issue with those sensors. Perhaps the wiping action of disconnecting your old sensor and connecting your new sensor cleared enough crud from the harness contacts to read the new sensor for a while. But if the harness contacts were pretty dirty/corroded for some reason perhaps it's now causing intermittent connectivity issues with the new sensor? Maybe clean/check the contacts for those sensors at the harness end. Or maybe even the harness itself (vs its contacts) is starting to develop intermittency issues?

It does kind of seem like that and it also seemed that on MHD at times it was not reading before, though it was pretty much only on start then it would read afterwards. I sprayed all connections with CRC electronic parts cleaner (car harness, both ends of the 3.5bar adapter, and pin side of the sensor) but all of them looked brand new even before cleaning. May be worth checking my DME connections.