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  1. Removing vapor canister vent valve in 2001 STS

    Cadillac Seville / Cadillac Eldorado Forum
    I need to remove the vent valve on my 2001 STS (to diagnose a P0440 code). I suspect the vent valve is defective as I no longer hear it click-click right after vehicle start. It's hard to reach, and there appears to be a single bolt well rusted in place (see #1 below). Any advice on how to...