Originally Posted by Leafy
Yeah a bad bcs would though a cel, a un pluged bcs would throw a cell. Having the wastegate plumbed directly to the intake with no bcs in there might throw one for failing to reach the boost target. Having an IAM of 0 due to a lot of knock would make it target wg pressure but would reset the iam to 8 after pulling the battery irrc.
It doesn't throw a cel for not reaching target boost. A bad/clogged BCS doesn't always throw a CEL either.
OP, check the BCS or if you don't feel comfortable take it somewhere. You can't rule it out until you test it.