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Ask Ron Z. Your Own Question
Ron Z.
Ron Z., - Mazda Tech -
Category: Mazda
Satisfied Customers: 18959
Experience:  18+yrs experience. State Inspector and Mazda Diagnostics
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Mazda 3 my check engine light was on.diagnostic was weak coolant.

Resolved Question:

my check engine light was on.diagnostic was weak coolant. drained coolant and reset light. it came back on again in a week. do I need to flush coolant? 2007 2.3 "3"
Submitted: 5 years ago.
Category: Mazda
Expert:  Ron Z. replied 5 years ago.

Welcome to! My name is DriveFast71(Ron) and I will do my best to answer all of your questions completely and accurately.


Do you happen to have the actual "p-code" associated with this?


Customer: replied 5 years ago.
Expert:  Ron Z. replied 5 years ago.

How did you come up with the dioagnosis of "weak coolant"?


Customer: replied 5 years ago.
rented the diagnostic pad from o'reillys
Expert:  Ron Z. replied 5 years ago.

And the actual description said "weak coolant" and there were no "p-codes"?


Customer: replied 5 years ago.
there probably was a p-code too but I dont know it.should I go find that code when they open?
Expert:  Ron Z. replied 5 years ago.

That'd actually help us out a TON. With the p-code I can help you diagnose the actual problem more accurately.


Customer: replied 5 years ago.
ok. I'm a rookie. get back to you later
Expert:  Ron Z. replied 5 years ago.

No prob. Just reply back to this thread like you have been, and we'll pick it up right from here.


Customer: replied 5 years ago.

The code is P-0126 and it says "insufficiant coolant temp for stable operation"

Expert:  Ron Z. replied 5 years ago.

Ok. There are a couple of things that can set a P0126- either a faulty Engine Coolant Temp (ECT) Sensor or a faulty Thermostat. To test the ECT you will need to have an Ohms meter and a thermometer. Remove the ECT and set it into water or varying temperatures, and take resistance readings. If the ECT passes the tests, replace the Thermostat.




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