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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.
Most cases can be resolved by replacing the pin and bushings in the hinge. These can be purchased at most Auto Parts stores on Do-It-Yourself aisle/rack. Some cases require replacement of complete hinge assembly.
When the ignition switch is turned on, the immobilizer control module sends a challenge signal through the antenna around the ignition switch to the transponder chip in the ignition key. The transponder key responds with an encrypted key code. The immobilizer module then decodes the key code and compares it to the list of registered keys. When the engine is started, the ECM sends a request to the immobilizer module over the data bus to verify the key is correct. If an attempt is made to start the vehicle with an invalid ignition key, the immobilizer module sends a message over the data bus to the instrument cluster to flash the anti-theft indicator lamp. If the ECM does not receive a "valid key" message from the immobilizer module within 2 seconds of engine start up, the ECM will disable the fuel injectors to kill the engine. You'll need to get a new key and get it registered in the immobilizer control module. You'll need a scan tool, the VIN number, the date manufactured and a factory-assigned PIN number.
there are many vacuum hoses,i dont know if this is a s10 or full size blazer, heres a diagram for the s 10 blazer with the 4.3 if this is not your engine let me know, but heres a diagram, just look over all the lines, hope this helps.
pull the rear cover off the diff, then remove the center block from the gear carrier, there is a single pin in the side that lets the block and cross pin come out, the push the axles in and remove the "C" clips retainers.
If you are referring to the ECU loosing its stored memories, you may want to check the terminals of your battery if they are loose. The ECU needs constant voltage to keep its data. Loose terminals while your car is off can make the ECU go on reset without the driver noticing it. If the terminals are ok, have the power wire or ground of the ECU traced for loose or open connections.