Error Codes 320D E90

Hey Folks.

I was wonder if the glowplug errors are actually legit. or cylinder 1-4 errors could be caused due to glow unit error

sometimes I get quite a rough idling when hot or cold, does not matter.

I first thought It was battery related, (the battery was bad) and had it replaced.

all error were cleared and these are the ones that came back after a few days again.

any input?

Engine / Motor Errors

Glow unit
Code: 004203

Intelligent Battery Sensor Layer
Code: 004A27

Layer Generator
Code: 004A07

Cylinder 1 Glow Plug
Code: 004212

Cylinder 2 Glow Plug
Code: 004222

Cylinder 3 Glow Plug
Code: 004232

Cylinder 4 Glow Plug
Code: 004242