Maf, P1128, P1130
 

I have replaced my MAF sensor and an O2 sensor bank 1 before cat because I was getting error code P0133 & P1275. Now I am getting P1128 & P1130. Any suggestions? Doc?

New codes indicate engine is running lean in Idle range which usually is caused by vacum leak.

I had the same codes. My research showed that the most common cause is a bad MAF sensor, usually remedied by cleaning it - which is what worked for me. Given that you just replaced the MAF I would strongly suspect that the new MAF is a bad unit!

Kirk

is there any walk through detailing where and how to check for vacuum leaks?

I don't know of any but if you can get SMOKE sucked into the intake it should be easy to find. there are machines made for this.