1997 540iA Check Engine Light...Codes

[zole2112]

My check engine light came on recently, 47,500 miles on car. Codes were for O2 sensors. Changed all 4 O2 sensors, still throwing codes as follows:

05 AfterCat O2 sensor heater, Cyl 5-8
0A PreCat O2 sensor, Cyl 1-4
0C AfterCat O2 sensor, Cyl 1-4
0D PreCat O2 sensor heater, Cyl 1-4
12 PreCat O2 sensor, Cyl 5-8
14 AfterCat O2 sensor, Cyl 5-8

I then reset again and it threw the following codes:

05 AfterCat O2 sensor heater, Cyl 5-8
0A PreCat O2 sensor, Cyl 1-4
0D PreCat O2 sensor heater, Cyl 1-4
12 PreCat O2 sensor, Cyl 5-8

My sensors are 4 wire (I had to splice in with the old connectors), Black/Grey/White/White...does a certain white belong with a particular white in the connector?

I am going to check my connections again, any other ideas?

Thank you!

[zole2112]

*Bump*

Anyone?

Also, which relay is for the O2 Sensor heater?

Thank you