Thanks, David,

My regular guy says that the pod or system to check and replace is actually under the hood, as in Hancheng's post above. True?

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-- Paul W. (The Benzadmiral)
('03 Buick Park Avenue, charcoal/cream)
Formerly:
'97 C230, smoke silver/parchment; '86 420SEL, anthracite/light grey; '84 280CE (W123), dark blue/palomino