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Replace the O2.
People I know who are formally trained automotive mechanics, you know the kind who went to school for it for 2 years are fanatical about the O2 being changed out before 50,000 miles.
People in the know regard them as consumable items.
Save the old O2 until you can get a scope meter with high resolution and data log then you can always put it back in and study it later on, maybe even do an a-b-a test.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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