P0128 dtc ?

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Feb 22, 2007 | 09:46 AM

silent1

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From: Chicago, Il

P0128 dtc ?

My engine started to buck and hesitate a lot on my way home yesterday, just running like garbage. After a while my ses light was finally triggered and a few seconds later, everything was ok. Hesitation and all were gone. The code is P0128 which is supposed to be "Coolant Thermostat (Coolant Temp Below Thermostat Regulating Temperature)" but when I looked at this same code in my LS1 Edit program it says "HO2S Bank 1 insufficient activity". Which one do I believe to diagnose my problem?

Feb 22, 2007 | 11:28 AM

2001NBMZ28

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From: Jacksonville, FL

I'd start by looking at the ECT sensor. Is your car an '01? www.gearchatter.com/viewtopic9163.php

Feb 22, 2007 | 12:37 PM

silent1

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Yeah, it's an '01. Why do you ask?

Feb 22, 2007 | 01:10 PM

2001NBMZ28

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Just wanted to be sure I posted the right gearchatter link...

Feb 24, 2007 | 09:29 PM

OUTLAWZ RACING

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From: COLUMBUS GA.

If your coolent sensor is shitty or starts to go out the pcm would think its -20 degrees and it will dump an assload of fuel and it probably wipe out your o2