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What year? I have some earlier model Lambda service info in the PDF links. Is does change some from year to year but this is all I have.
Since a lot was disturbed doing the engine work, make sure all the grounds are connected properly and check the engine compartment fuse block, it has a tendency to be loose, especially after repairs and not re connected properly. Then also check other connectors making sure they are tight and no bent pins. One of the wiring diagrams should show wiring to your O2 sensor. Use the search function on the PDF to find what you are looking for.

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