Thread: Code p128
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Old 01-31-2009, 04:11 AM   #3
bdrake
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Join Date: Feb 2008
Location: Montrose, CA
Posts: 33

2002 L-Series 3.0L Sedan
Default Re: Code p128

Yep, it's the thermostat. The good news is that if your engine isn't overheating, and if you don't live in a freezing climate, you can ignore it until next year, when you have to get the car smogged (or until you sell it). I drove my car for about 18 months with the P0128 code; I live in Southern California.
Replacing it is not a fun job; the thermostat is under the intake plenum.

--Barry

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