Help with bank 1 sensors.
 

Had a bank 1 sensor 1 code a couple weeks ago figured the sensor was just bad and replaced it 3 weeks later now i have a bank 1 sensor 1 and bank 2 sensor 1 codes. What could be causing this i have a 2010 z with just under 62k on it also the back o2 sensors have extended bungs and im running berk hfc.

Did you replace the bad sensor with the Nissan OEM one or an aftermarket? There have been reports of continued codes if the sensors are not identical units.

The HFC wouldn't have any effect on the sensor 1 codes as upstream O2's are located in the header collector

Only replaced bank 1 sensor 1 and it was oem replacement, and posted the hfc and extended bungs for any issue that should throw all four the back too wont trip.

What is (are) the actual codes? Did you use any power tools when you replaced the sensor?

I have this same code and have some Denso replacement sensors from Rock Auto sitting on my shelf at home because I'm dreading trying to get the old ones out.

Just as a formality, you did disconnect the battery during/after install right?

the codes its throughing are P2A00 x3 and P2A03 x2

Look for leaks in the intake system between the MAF and heads and for leaks in the exhaust between the heads and the primary O2 sensors. If the sensors were actually bad you'd most likely have other codes showing up.