Mechanics

CHEVROLET SILVERADO SENSOR PROBLEM

2003 Chevrolet Silverado • 125,000 miles

2500 hd
it will not idle at all when its cold but after it warms up its just fine. Their is some codes that come up when its cold and have changed the sensors and still dont know what it is.

First code is po171 my book says system too lean bank 1
Second code is po172 system too rich bank 1
third code is po158 02 sensor circuit high volts bank 2 sensor2
fourth code is po300 random multiple cylinder misfire dectected
what else can I do
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February 12, 2013.



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