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Well code 125 means the engine is not getting hot enough for the emission system to work. In most cases you need a new thermostat, but it could also be a faulty coolant temp sensor.
There is a chance that your temp sensor is the culprit on both codes. The temperature sensor is what tells the ECU how hot or cool the engine is and weather or not to keep the engine in phase lock loop, or choke, mode. If the engine stays in phase lock it will run too rich and the O2 sensor will not be able to compensate.
You will need to take it to your local dealer for them to pull code and call Delco for the unlock code,This usually takes about 10-15minutes.Make sure they give you the unlock code so you could use it for that radio if you lose power to it .
shouldnt have to pay notify a chevy dealer in person for code most dealers wont deal with a code problem over phone they dont charge for the code due to the fact that a dead battery can also lock out the radio system into the anti-theft mode
Try 0000 to unlock the radio, if the radio does not take any more codes you can reset the radio by disconnecting the battery and reconnecting it after 1 min. If 0000 does not work, go to radio-code.com. There is like $12.00 fee, but that's better then the dealer and you get to keep the code. Good luck
First try to disconnect the positive battery cable for 30 mins. This is the way to clear the TCMwhich is were the clicking is probably coming from. I hope this helps.
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