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Failed emmissions codes

(1998 GMC Yukon)
in Chicago, IL on January 16, 2010
Does anyone out there know what these codes mean? The emmissions place did not know?? P0155 and P0300? Trying to get an idea b4 I go to mechanic so they tell me the truth! Thanks!
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Popular Answer
on February 05, 2010
Here is some info abou both codes:
http://repairpal.com/OBD-Code-P0135-and-P0155
http://repairpal.com/OBD-Code-P0300
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