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Dealer estimate for same job on my 97:
air pump $279
check valve $89
relay $42.07
clamps, gasket about $8.
2 hours labor
total estimate $534.
My pump set codes 442 and 446 on my 97 in July (I don't know what 446 is). Had the dealer just turn off the light. CE light stayed off until November. That time I turned if off with an OBD-II scan tool and it hasn't come back on.
In the meantime I bought a new valve, clamps, and gasket and plan to install the valve this weekend. I'm hoping the new valve will keep additional water out of the pump and all will be well. From what I've seen on this board that's unlikely but I have nothing to lose. While I'm at it I might remove the pump and take a look at it, might not. It's not like I can fix it.
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