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#1 | ||||
Master Member
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![]() 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 As of 09/30/17: 223,751 Miles - SOLD New owner As of 01/01/18: 225,000 Miles 2013 Mazda 3 HB - new in October 2012 As of 03/20/18: 46,135 Miles
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#2 | ||||
Senior Member
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![]() 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.
... http://www.youtube.com/richpin06a
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#3 | |||||
Master Member
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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 As of 09/30/17: 223,751 Miles - SOLD New owner As of 01/01/18: 225,000 Miles 2013 Mazda 3 HB - new in October 2012 As of 03/20/18: 46,135 Miles Last edited by TXSaturn02; 08-18-2007 at 01:38 PM..
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#4 | ||||
Master Member
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![]() 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.
![]() ![]() ... 2002 SL2 Manual - new in November, 2001 As of 09/30/17: 223,751 Miles - SOLD New owner As of 01/01/18: 225,000 Miles 2013 Mazda 3 HB - new in October 2012 As of 03/20/18: 46,135 Miles
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#5 | |||||
Junior Member
![]() Join Date: Dec 2007
Posts: 14
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#6 | ||||
Super Member
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![]() 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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#7 | ||||
Member
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![]() 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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#8 | |||||
Master Member
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![]() Quote:
... 2002 SL2 Manual - new in November, 2001 As of 09/30/17: 223,751 Miles - SOLD New owner As of 01/01/18: 225,000 Miles 2013 Mazda 3 HB - new in October 2012 As of 03/20/18: 46,135 Miles
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#9 | ||||
Member
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![]() 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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#10 | ||||
Master Member
![]() ![]() ![]() Join Date: Apr 2009
Location: 255.255.255.255
Posts: 6,853
1997 SL2
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![]() Good for you keautocenter!
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