94 atx multiple codes. are they related?

[blademr2]

Hello, I am a new SHO owner.. The car I purchased at what seemed like a really good deal at the time.. not so sure now..
Anyway, I have the following codes and to me, they seem possibly related. ANY input would be helpful..

172 HEGO sensor circuit indicates lean. (Rear Side).
176 HEGO sensor circuit indicates lean. (Front Side).
332 Insufficient EGR flow.
452 Insufficient input from VSS.

you can hear a vacuum sound under the dash at idle that diminishes with throttle. Are there vacuum lines that regulate operation under the dash in the stereo area on a SHO and could that be causing all those codes?
Also, occasionaly when slowing down, it feels like the tranny is trying to drop down one gear too many and jerks the car a couple times before going to propper gear. Is this also a related condition, or am I looking @ a tranny rebuild as well? I already tried servicing it and adding some Lucas Trans Fix...

 

[riden2low]

yep, your air condition and heater control runs on vacuum. They might be cracked or pulled loose. Just pull the dash cover over steering wheel and pull the unit and on the back side you will see the rubber tubing

 

[deercrusher]

The VSS can cause your shifting problems. That's the vehicle speed sensor and it probably needs to be replaced. 332 means you might get away with removing the EGR and throughly cleaning all of the passages with a good carb cleaner and a tiny wire brush/pipe cleaner.

 

[whiteguy3]

For the 332 code reference the above post. Change your VSS for the 452 code.

 

[blademr2]

Thanks for the help. I will try those things and get back to you all with results when i am done..

 

[sperold]

Codes are always related, I have learned lately.
Great advice from the guys above.
Get that vacuum leak solved, even if it means plugging the hose from the engine compartment that runs into the dash area, then read the codes again, your O2 sensor reference may go away (or not).
Your tranny issues are caused by the VSS and you can seach that on this forum for back up information.