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2002 Honda Civic P0128 remains after OEM thermostat replacement


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jeffblake
New User

Mar 16, 2017, 2:18 PM

Post #1 of 1 (217 views)
2002 Honda Civic P0128 remains after OEM thermostat replacement Sign In

2002
Honda
Civic
1.7L
164,000 Miles

Hello,

My Civic was taking far longer than normal to warm up to operating temperature (often it did not even warm up completely before arriving to my destination). After a week or two the CEL came on and gave a P0128 code. I replaced the thermostat with a non-OEM one from Autozone and the problem went away.

A few months later the P0128 code came back. The time it took for the engine to warm up was normal and it consistently ran at operating temperatures. I did some research and found out that it would have been better to use an OEM thermostat. So, I installed an OEM thermostat a month ago and cleared the P0128 code with my OBDII sensor/reader device.

About a week ago the P0128 code came back on. Also, the operating temperature seems to be slightly lower than it used to be (before I ever got any P0128 codes and changed the first thermostat). The car does warm up in a reasonable amount of time and once it is warmed up, the temperature gauge stays steady.

I am confident that my coolant level has always been full and that there have been no bubbles in the system.

Do you have any ideas of what I should try next? Thank you for your time.

-Jeff






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