P0128 & P0303 - Check engine light on on 2003 Chrysler PT Cruiser

First occurrence of issue. Cold (15 degrees F) temperature start up - saw check engine light on - and has stayed on. Used scan tool to find two DTC's P0128 & P0303. Can you determne what is wrong just from this (& what I need to do to fix it)?

by in Livonia, MI on December 20, 2010
1 answer 1 comment
ANSWER by on December 20, 2010
P0128 is likely to be a stuck open cooling system thermostat or low coolant level. P0303 is a number three cylinder misfire, check the spark plug, fuel injector and connection or vacuum leak at number three cylinder.
COMMENT by on January 30, 2011
Yes, very cold day in Jan the code appeared

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