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2001 Chevy S-10 Trouble codes

Tiny
THALICTRUM
  • MEMBER
  • 2001 CHEVROLET S-10
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
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.
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Friday, March 20th, 2009 AT 5:43 PM

5 Replies

Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,750 POSTS
Filler neck wont cause o2 sensor codes. Did you replace thermostqt for coolant sensor problem, im finding thats the problem
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Friday, March 20th, 2009 AT 6:06 PM
Tiny
THALICTRUM
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  • 4 POSTS
I replaced the coolant temp sensor a while back. The P 0128 code came back on about 6 months later.
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Friday, March 20th, 2009 AT 6:09 PM
Tiny
MASTERTECHTIM
  • MECHANIC
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Recheck coolant temp sensor and replace again if needed, also check wiring connector to make sure its good and tight
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Monday, March 23rd, 2009 AT 8:06 AM
Tiny
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  • 4 POSTS
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.
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Monday, March 23rd, 2009 AT 8:25 AM
Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,750 POSTS
Holbrook. Jt auto on 400 south franklin st.
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Monday, March 23rd, 2009 AT 2:30 PM

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