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420A Help with engine codes?

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QuickTalonTsi

Probationary Member
2
0
Nov 25, 2002
Texas
my bro just bought a 95 eclipse gs and it has a check engine light..i read the code and it gave me code 12, 21, 55. by any chance..anyone know what those might be it? i need to clear it before getting it smogged.
 
in my resource all data a code 12 means the battery was disconnected.
21 has some thing to do with an o2 sensor but i dont know which one or why.
dtc 55 does not have any info sorry.
Have some one scan it to get more info.
If possible probe o2 wires with a volt meter an make sure is switches voltage. it should switch between under 1 volt with .5 as a center at idle.
 
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