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alltracman78
09-28-2011, 06:12 PM
I'm posting this up for FYI and the archives, since I couldn't find any info on it and it's not listed in the ST205 BGB codes.

Code 23 on the ST205 is for the intake manifold temp sensor [MAT].
Bad sensor, wiring or ECU.

02bluerolla
10-05-2011, 05:19 AM
what are the sympthoms on the car?

alltracman78
10-05-2011, 03:20 PM
A MIL.

I swapped the ST205 electronics to my 185 engine [with my 185 harness].
The pin for the manifold temp sensor on the 205 is the pin for the EGR temp sensor on the 185.
On the 185 non Ca models there's a resistor plugged into the EGR temp sensor connector.
I left it in [short term, it's already out] when I hooked up the 205 stuff and it gave me a code 23.
Once I hooked up my actual MAT sensor the code went away.