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Q:

failed emmissions codes on 1998 GMC Yukon

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
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!
(1) Answer
Here is some info abou both codes:
http://repairpal.com/OBD-Code-P0135-and-P0155
http://repairpal.com/OBD-Code-P0300