GoOgle "youtube hhr fuse box" for the how to fix crazy gauges. I'm betting the geniuses at the dealer didn't think to check it.

 

gauges are fine now. dealership fixed that about four months ago. They just could not figure out why it was running lean and rich and no vacuum leak found either. do you tighten those four bolts down till you hear the click or popping sound. then tighten them again.

 

If possible you should push till click, then tighten bolts.

 

DONBREW only CEL that it has is a P0171 (lean condition). can't seem to find what is causing it.

 

Typically cracked flex pipe or purge valve. Maybe Injector seals, burned intake valve, intake seals, TB seal, PCV tube.

P0171 means extra air is entering the A/F somewhere between the MAF and the #1 O2 sensor. NOT too little fuel usually, because there are other codes for that.

Very tiny possibility of low fuel pressure or bad injector or bad #1 O2 sensor.

Dealership techs can't seem to find vacuum leaks, because they can be difficult to find. Flat rate techs don't like to spend their time doing anything other than wrenching.

 

I vote flex pipe!