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The fan or blower I was refering to injects air into the exhaust when the engine is cold to help burn off excess fuel. Usually runs about 2 minutes after cold engine start. The blower take in air through a 1" tube from the air cleaner and is located under the battery tray.
A crack in the CAT? Try welding it up, replacement is expensive. As for the error message for the rear O2 sensor, it says that there is no signal. The rear O2 sensor doesn't do much, just checks the efficiency of the CAT.
Klaus
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Proud owner of a 220S. If I had more room, I would have more Volvos.
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