Thermostat & cooling question

2004 MAZDA 3
95,000 MILES
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AMYR1982
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My "check engine" light came on recently and I took my vehicle to a local auto store to check the codes. They found P0126 & P0128. I looked up the codes and found probable causes being low coolant level, open or short circuit condition or faulty ECT sensor. I checked the coolant level and saw that it was right at the minimum line. I added some coolant and waited a few days to see if that did anything. Nope, the engine light is still on. I've been scouring the internet for any help and keep seeing that the problem could be that my thermostat is stuck open and should be replaced. I'm a DIY kind of girl and if I have the tools to fix it, I can. Plus, I saw what people were paying and I don't think I could afford that right now. So, I guess I'm looking for any help or guidance in fixing this situation. In my state, we have to pass emissions testing before renewing our tags and I have until January to do so. Any comments, help, suggestions, etc would be greatly appreciated!!!
Nov 8, 2011 at 1:16 AM
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FIXITMR
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yes, it points to thermostat problem. change it and you should be good.
Nov 8, 2011 at 1:49 AM
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FIXITMR
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OK, i did some more checking and yah there are some other possibilities. is the heater nice and hot? is the temp gauge where it should be?
Nov 8, 2011 at 1:54 AM
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FIXITMR
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and actually your year had related computer issues that require a re flash/update if it hasn't been done already?
Nov 8, 2011 at 2:00 AM
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AMYR1982
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Yes, the heater does get pretty hot. The engine takes about 5 minutes to get to middle point on the gauge. I don't think I've had an update.
Nov 8, 2011 at 2:16 AM
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AMYR1982
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I've also been looking around some more and I've seen that some people have replaced the coolant temp sensor. I'm wondering if I should try that or start with a re flash of the computer.
Nov 8, 2011 at 2:35 AM
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FIXITMR
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are you the original owner?
Nov 8, 2011 at 4:13 AM
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AMYR1982
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No, there was 1 owner before me. I bought it in 2006.
Nov 8, 2011 at 4:25 AM
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FIXITMR
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if you take VIN number the dealer may have a way to look up if it's been updated.
Nov 9, 2011 at 1:17 AM