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Confused about OBDII codes. 850 1991

Car could seem to run fine but burning lean (typical of an 02 sensor going). May not be 02 sensor either, but some vacuum hose leaks that are registering on the 02 sensor. Just keep an eye on things....How's the exhaust? Is there a sooty surface on the tail pipe? Are the plugs turning black? Just a few things to check out. Most 02 sensors go around 100K+ miles and so many routinely replace them at 100K miles.
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1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon. My cars have been running so well lately they've got me worried.






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