OK so after a day the light came back on. Hope this helps anyone else that has this issue. However, The service manual has you disconnect the battery before doing any of these steps which by itself might reset you cars computer and erase the light. You might have to use a code scanner to erase the fault code and get the engine light to turn off. If it ends up coming back on I will take it to the shop to get it done. The car drove about 30 minutes this morning without the light coming back on. Even though I ended up spending more than I needed to It was still about half the price of taking it to the shop for them to do. So in total I spent $70 on parts because I threw out the first sensor after removing i because i thought it was bad. It may help you elevate the hose to keep from losing coolant though. I think it also says to disconnect the air hose, but that wasn't really in my way. Trust me when I say it is a pain to remove the thermostat housing if you do not remove the battery. The main thing is to disconnect the negative battery terminal first, and remove the battery. The service manual for the CX-5 has fairly detailed instructions to replace the thermostat. However, if you replace the Thermostat you do need to drain some into a clean container so you can pour it back in when you are done. I did not have to drain any coolant to replace the sensors. I replaced the sensor last night in about 10 minutes. I picked up the sensor from AutoZone for $30. Should be obvious but disconnect the plug before unscrewing the sensor to prevent damaging the wires. The sensor is on top with the wire plug going into it. there are 2 hoses gong into a metal connection. The 2nd ECT sensor is located on the passenger side against the firewall. You will need a deep 3/4 inch (19 mm) socket. For any who might have this issue themselves, here's where they both are: Coolant temperature sensor 1 is located on the engine slightly above the housing for the thermostat (Next to the battery). The second ECT sensor was easy enough to find. It appeared about 15 minutes into a 30 minute drive. The check engine light came back on the morning after replacing the thermostat.
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