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I had the same code keep popping up. The rubber supports for the air injection pump were shot so I replaced them. Still had the codes and looked at the connection for the vaccuum line where it goes into a rubber connector and the thing fell apart in my hands. Cut off the bad section and fitted the vaccuum line back in and the code hasnt come back. Still need to find a new section of hose to make it a permanent fix. It's amazing how common these problems seem to be. Good luck with the fix.
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97 S90 with 175K miles still going strong
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