So, I've been battling the idle issue for a while now, as some of you may know by my excessive posting on the subject. I've been reading as much as possible on possibly problems/solutions and have tried a number of them but nothing seems to work. Since I've owned the car (about 5 months) I've cleaned the EGR, checked all the intake piping for creaks/leaks by visual inspection and spraying brake cleaner to listen for changed in idle, replaced the wastegate actuator with new vacuum line as well, and just yesterday I replaced a missing bolt that was missing off the exhaust manifold which improved engine performance and cured the whistling I was hearing, but didn't effect the idle.
For the past week or so my car has been showing a CEL and I went to autozone to have them check it out. Here are the codes:
P0131 - Heated oxygen sensot HO2S (RF) circuit low input
P0134 - Heated oxygen sensor HO2S (RF) circuit no activity
P0171 - Lean Air/Fuel ratio bank 1
P0660 - IMCC actuator circuit malfunction
Could it be that I just have a bad O2 sensor on the exhaust manifold? Thanks guys. I really appreciate the help!