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P0137 and P0157
I have both of these codes on a 2000 Silverado with a 4.8 engine. I am looking for some advice. I already have preformed the entire fuel pressure check that is outline in the Haynes manual and replaced the Fuel Pressure Regulator, as the pressure was low. However, the code persists after resetting it. I have heard form other sources that the O2 sensors GM used in these trucks are due for replacement after 100,000 miles. Is this true? Also what voltage reading should I be seeing at idle and at wide open throttle from the O2 sensors. I have already checked the connectors for water and corrosion and they look fine.
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