2001 Chevy S-10 Trouble codes

2001 CHEVROLET S-10
150,000 MILES • 6 CYL • 4WD • AUTOMATIC
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THALICTRUM
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Recently had the gas tank and fuel pump replaced. Plugs, wires, cap are not that old. Went for an inspection and failed with these trouble codes:
P0128--seems to be reocuring--already replaced the coolant temp sensor once.
P0155
P0300
I do need to replace the gas tank filler neck valve as it may be leaking but not positive. Would a leak cause the above 02 sensor codes to happen? Not sure if I should start by replacing the o2 sensors or start by replacing the filler neck valve.
Mar 20, 2009 at 5:43 PM
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MASTERTECHTIM
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filler neck wont cause o2 sensor codes. did you replace thermostqt for coolant sensor problem, im finding thats the problem
Mar 20, 2009 at 6:06 PM
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THALICTRUM
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I replaced the coolant temp sensor a while back. The P 0128 code came back on about 6 months later.
Mar 20, 2009 at 6:09 PM
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MASTERTECHTIM
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recheck coolant temp sensor and replace again if needed, also check wiring connector to make sure its good and tight
Mar 23, 2009 at 8:06 AM
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THALICTRUM
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Replaced the thermostat and the pre cat O2 sensor. Every thing seems fine now...no codes. Thanks. Where is your shop in Boston? I also live there.
Mar 23, 2009 at 8:25 AM
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MASTERTECHTIM
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holbrook. jt auto on 400 south franklin st.
Mar 23, 2009 at 2:30 PM