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2002 Nissan Altima Serice Engine Soon light CODE P0420 
Edmunds Answers | by altima02ownr | Tue, Apr 7
Edmunds Answers is the #2 Blogger for Nissan Motors
Can someone please suggest me what to do now. Since the "Service Engine Soon" light is gone. Should I wait until it comes back up? or take it to local garage or another nissan Dealer and get the pre-cat changed for much lesser price (Other Nissan dealer is charging me arounf $900 with O2 sensors......
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