P0500 -- Vehicle Speed Sensor
I already replaced it a couple years ago when I had the same fault code.... I remember the code coming back immediately after I replaced the part, and just forgetting about it.

P0120 -- Throttle Position Sensor A circuit malfunction
I tested this part today as a culprit for idle/driveability issues and determined it's bad

P0400 -- EGR Flow Malfunction
I guess I should clean it. I wonder if doing a hardcore seafoam treatment a while back had anything to do with this...?

P1705 __ Manufacturer Conrtl Transmission
No clue, but my OD OFF light flashes when I start the car. Sometimes it seems impossible to get the tq converter to unlock/downshift, shifts seem unexpected, etc. I'm hoping that has to do with the TPS, but it may not.

I cleared them and will see what comes back, and go from there. I'm pretty positive I'll be needing a TPS, and I'm wondering if the 1st and last one are related somehow?
My speedo is also real flakey. It works most of the time though. I'm guessing thats just a bad cluster unit itself and doesn't have anything to do with the VSS as I originally thought.... Your thoughts?

 

P0500 - your speedo is bad. Doesn't make much sense but it's true.

 

Yeah. My neighbor is a technician for Infinity. He agrees. Is that a code that triggers a CEL?

I've had the cluster out before, tried tightening some screws, but it didn't help. It's not that high on the to-do list anyways.

 

Did you mean Infiniti?

 

Obviously. Thanks for your input on the situation.

 

How many times does your o/d light flash? Are they the same flashes?

 

When I turn the key to ON, the OD light comes on solid for about 3 seconds, then flashes either 15 or 16 times. I tried to check again, but I cant get it flash anymore.