O2 sensor installed incorrectly during header install?

[BeNNoBeDiT]

I recently installed a schmiedmann header kit (SCM395254) it took a few weeks only able to work on the car in the weekends
and now i think i possibly might have possibly switched o2 sensors bank 1 (cylinder 1-3) and bank 2 (Cylinder 4-6)
is the anyway to see what sensor is one and two on the connector?

Second question:
On the new kit the cats are further down the exhaust system (ca under driveshaft bearing) and to install the secondary o2s i had to make the wires longer.
will this effect anything?

Shortly after starting it had some o2 sensors errors thats why im thinking this
deleted and havent shown up yet (tho i only drove about 1 km) waiting on exhaust shield before taking it on longer trips

Thanks :)

[jicaino]

Yes, you shouldn't splice on the sensor side. Proper way to do it is use some splice contractors specially designed for 0² sensors, they come along with Bosch universal sensors and they can also be purchased separately although they're hard to find. On cars that have special requirements, what I've done in the past is cut an old failed sensor wiring right next to the sensor, and use a donor harness or a body side connector creating an extension, or extending the body side connector with traditional splice and solder methods.

Regarding your situation I think it's easier to just swap them sensors around, clear adaptations and see if that solves your pending codes (rather than to go wirong harness fishing to see if you connected them right)