626 Immobilizer, OD, A/C all have intermittent issues
 

Hi,
For a couple of weeks the fans for my A/C would not come on, no matter which settings I tried. Then they just started working again. That was last Sunday. Then while driving on the interstate Wednesday I felt the car stall for about a half second and the immobilizer light came on for about the same length of time, this happened once more in the 20 minutes it took me to get to work. The first time I was doing appx 80 mph, the 2nd 15 mph. The following two days no recurrence, then my car sat for two days. Then, a quick drive to the store 1.5 miles away, no issue, when I got in to head home I noticed the car felt "heavy" in the pedal and was bumping gears. I then saw that the OD light was continuously flashing and continued to do so for the remaining 5 minutes. As an additional issue the check engine light has been on for a couple of months, I have an OBD reader and get a generic 600 code. It's at work now but I'll check it again in a couple of hours and see if anything new is appearing.

I haven't a clue as how these can all be related, and don't think they are part of the ECU. Being an 11 year old car I was considering changing out the relays in the hopes that one was going bad. But with the issues across platforms I'm not sure that that is the way to go.

Thanks for any feedback you can give. I've got a 30 mile commute and I really hope it makes it this morning.

Ok so obd codes are P0400 - EGR Flow, this has been registering for a while, had the egr replaced about 9 months ago, code reappeared about 2 months later. A new code P0715 - Turbine/Input Shaft Speed Sensor Circuit