Originally Posted by 2007Civic4Me

I have an early build 2007 (October) HCH II. About a week ago, I had the IMA, Check Engine, Battery Light issue which has been discussed in other threads. I went to the dealership and they diagnosed the problem within an hour stating that the rotor sensor needed to be replaced. They told me that they would try a software update first to see if that would fix the problem. Apparently, that did not work because the software was already up to date.

A couple days later, I got my car back from the dealership and so far there seems to be no mechanical/electrical problems but I have noticed the following:
1) There is a low volume high pitch whirring sound whenever I accelerate
2) My FE seems to have taken a 3-5 mpg hit where the IMA does not seem to kick in as readily and therefore the ICE has to work harder

Has anyone else with this problem experienced anything similar?

Thanks in advance.

Originally Posted by Mokche

Mine had same problem, whirring if from worn bearing of ac compressor, had it replaced and symptoms disappeared.