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Old 03-01-2015, 12:13 PM   #1
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Check Engine light and Code P0128

Howdy. Last night I was driving and my check engine light came on. I went to an auto store today and they did the computer thing and they said it was Code P0128 and they said it should go off by itself after a few driving cycles.

What do you think? Everything seems to be running fine. No engine noises, no sputtering, AC runs fine, etc.


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Old 03-01-2015, 12:39 PM   #2
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You can find a listing of many codes here:DTC Codes (Detailed Descriptions) (from the How To stickies at the top of the page)

That one, for "thermostat malfunction", can sometimes pop up on an unusually cold day for your area if the car doesn't warm up as fast as usual.

Something to keep an eye on, pat attention to heat avail. and the gauge reading for anything unusual - checking it out closer if it doesn't go away.


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Old 03-01-2015, 12:47 PM   #3
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I'm going to disconnect the car battery which will reboot the system (and turn off the check engine light). If the light comes back on, that means there's something wrong with the car.
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Old 03-18-2015, 02:57 AM   #4
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Update: I disconnected the battery on March 1st (the day after the light came on) and when I reconnected the battery, the Check Engine Light was off and it remained off until tonight (March 17).

This means there is something wrong with the car and is likely the PO128 code that I got last time.

Looking online and what this code is, I see there are a number of things that could be wrong:

Defective Engine Thermostat
Defective Engine Coolant Temperature Sensor
Defective Intake Air Temperature Sensor
Defective Cooling System
Low Engine Coolant
Dirty Engine Coolant, causing incorrect Coolant Temperature Sensor readings
Defective, always running Engine Cooling fan(s)


Where can I go to find out exactly what's wrong?
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Old 03-18-2015, 05:08 AM   #5
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You can't, most codes have way more than one cause and you have to work that out or pay others to do the same. In your case the thermostat needs to be changed (sticking open) is most likely cause but no 100% guarantee there so don't go looking for it.

Looking for the quick cure? The last three items on the list can easily be checked by you and don't take two minutes to do. We can't breathe for you...............

FYI, when you let others check for dtcs look over their shoulders to get the EXACT numbers yourself, counter guys will often make up codes to sell you parts that do nothing. As well, bringing those numbers online here if not 100% correct can have us telling you to change hundreds of dollars worth of parts that again don't need changing.
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Old 03-18-2015, 12:54 PM   #6
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Update on situation: Coolant levels are fine and not dirty, so that eliminates two of the problems. The engine is not over-heating so that eliminates a stuck-closed thermostat.

It's very likely it's just a thermostat stuck open.
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Old 03-18-2015, 01:10 PM   #7
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Here's info. on a way to check for that:Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum - View Single Post - Low temperature heater output

The diagnostic mode will let you watch temps as it warms up from a cold start.

Unusually slow warm up/not getting fully warmed up is what your code implies, this is a way to check that. Gauge rapidly goes to the center area when temps approach normal, it's a fancy idiot light as it reports only cold, normal, very hot & too hot.
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Old 03-18-2015, 03:18 PM   #8
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New update: Went to Advanced Auto Parts and they checked the code and showed me. Thermostat is stuck open so the engine is cooling.
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Old 03-18-2015, 04:32 PM   #9
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There you go, one tracks the issue down by process of elimination and deductive thinking.
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Old 03-22-2015, 02:48 AM   #10
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Check Engine light went off by itself while driving.
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