Certain parameters have to be met before the CEL will set, I am assuming the battery was disconnected or computer reset at some point and the car was not driven enough to set the o2 monitor. Once that happened, the self tests will run at their appropriate times and set the CEL if a fault is discovered. 99% of the time, splicing o2 wiring yourself will result in issues, you are better off with the plug in extensions.
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If the oxygen sensor pigtail wiring, the connector, or the terminal are damaged, replace the entire oxygen sensor assembly. Do not attempt to repair the wiring, the connector, or the terminals. In order for the sensor to function properly, the sensor must have a clean air reference provided to it. This clean air reference is obtained from the oxygen sensor wires. Any attempt to repair the wires, the connectors, or the terminals could result in the obstruction of the air reference. Any attempt to repair the wires, the connectors, or the terminals will degrade the oxygen sensor performance.
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