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Old 08-18-2007, 12:10 PM   #1
TXSaturn02
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2002 SL2
Default P0128 - 2002 Sl2 - Help

OK guys. Need suggestions and your HELP. On the way home from work yesterday my Service Engine Soon light came on - first time EVER. I'm now at 84,018 miles. Took it to the Autozone and they gave me the code of P0128. Meaning I need to either:

1) Check Coolant - seems fine and temperature is fine also.
2) Temperature sensor is bad.
3) ECTS is bad - Since I have a 2002 I should have the brass one, but I've never looked.

Should I just go to the dealer and get the Temperature sensor? Any idea of what that part number is?

I'm at the Autozone right now on my laptop. Will leave as soon as I post this and head to the dealer. Will check for messages then.

TIA

...
2002 SL2 Manual - new in November, 2001
Sticker: $13,995 As of 07/14/14: 194,301 Miles

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Old 08-18-2007, 12:34 PM   #2
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1998 SL2
Default Re: P0128 - 2002 Sl2 - Help

Another thing that will set off a po128 is a defective thermostat.I would pull the PCM B fuse to clear the code to make sure its a hard fault.

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Old 08-18-2007, 01:29 PM   #3
TXSaturn02
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2002 SL2
Default Re: P0128 - 2002 Sl2 - Help

Quote:
Originally Posted by richpin06 View Post
Another thing that will set off a po128 is a defective thermostat.I would pull the PCM B fuse to clear the code to make sure its a hard fault.
Thanks Rich. I'll try that before buying the thermostat. Something the parts guy here mentioned that if the car is running and the coolant in the resovoir (sp?) does not move around after a while, that is an indication of the thermostat going bad.

Where is that PCM B fuse? Under the hood or by the passenger seat? The service guy here at the dealer stated that it was very unusual for a thermostat to go bad on a 2002. He said he only saw a few of those. I'll go do the fuse thing right now.

Thanks.

...
2002 SL2 Manual - new in November, 2001
Sticker: $13,995 As of 07/14/14: 194,301 Miles

2013 Mazda 3 HB - new in October 2012
Sticker: $20,850 As of 07/14/14: 10,364 Miles

Last edited by TXSaturn02; 08-18-2007 at 01:38 PM..

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Old 08-18-2007, 01:53 PM   #4
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2002 SL2
Default Re: P0128 - 2002 Sl2 - Help

Thanks Rich! You Da MAN! I found the PCM B fuse and had to pull hard to get it out. In the process, I lost the darn thing somewhere in the engine compartment. No biggy. I just replaced it with a spare one and started the car and bada bing! The Service Engine Soon Light is gone! I'm about to leave the dealer. If ya don't hear back from me, I'm good!


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2002 SL2 Manual - new in November, 2001
Sticker: $13,995 As of 07/14/14: 194,301 Miles

2013 Mazda 3 HB - new in October 2012
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Old 05-11-2010, 03:02 PM   #5
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Default Re: P0128 - 2002 Sl2 - Help

Quote:
Originally Posted by TXSaturn02 View Post
Thanks Rich! You Da MAN! I found the PCM B fuse and had to pull hard to get it out. In the process, I lost the darn thing somewhere in the engine compartment. No biggy. I just replaced it with a spare one and started the car and bada bing! The Service Engine Soon Light is gone! I'm about to leave the dealer. If ya don't hear back from me, I'm good!

WHere is this PCM B fuse?

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Old 05-11-2010, 03:10 PM   #6
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1996 SW2
Default Re: P0128 - 2002 Sl2 - Help

Quote:
Originally Posted by nbdew002 View Post
WHere is this PCM B fuse?
In the underhood fuse box. There's a guide on the underside of the cover, and in your owner's manual.

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Old 10-23-2010, 01:31 PM   #7
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2001 SL1
2002 SL1
Default Re: P0128 - 2002 Sl2 - Help

I also have 2002 SL1 with a p0128 code. The temp gauge is just over 1/4 when driving, but it has plenty of heat coming out of the heater. I really am not sure what to do first, the thermostat or the ECTS or ECTS wire harness. If it was 2001 or older, I would do the ECTS or harness first. With the coolant getting up to temp, I have a hard time believing that it is the thermostat, but then again, the gauge is just barely over 1/4. What do you think?

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Old 10-23-2010, 02:04 PM   #8
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2002 SL2
Default Re: P0128 - 2002 Sl2 - Help

Quote:
Originally Posted by keautocenter View Post
I also have 2002 SL1 with a p0128 code. The temp gauge is just over 1/4 when driving, but it has plenty of heat coming out of the heater. I really am not sure what to do first, the thermostat or the ECTS or ECTS wire harness. If it was 2001 or older, I would do the ECTS or harness first. With the coolant getting up to temp, I have a hard time believing that it is the thermostat, but then again, the gauge is just barely over 1/4. What do you think?
It is most likely the thermostat. After pulling the fuse, it reset the code. But after a few weeks, the code returned. I replaced the thermostat and the code has been gone ever since... Replace it - it is a cheap part and if you have the right tools, not that hard to do on your own.

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2002 SL2 Manual - new in November, 2001
Sticker: $13,995 As of 07/14/14: 194,301 Miles

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Old 10-28-2010, 07:37 PM   #9
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Default Re: P0128 - 2002 Sl2 - Help

I wanted to let everyone know that I did change the thermostat and it solved the problem. I'm grateful for the help that everyone offered.

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Old 10-28-2010, 09:45 PM   #10
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Default Re: P0128 - 2002 Sl2 - Help

Good for you keautocenter! just goes to show what one can accomplish with a 3/8" drive ratchet and a 10mm deep-well socket (IIRC)

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