bad cat or oxygen sensor DTC 16805 or 17519
#21
AudiWorld Senior Member
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Update. I replaced the B1S2 or passenger post cat oxygen sensor and installed anti foulers at the same time. Problem solved. I've driven 3 days and 100+ miles with no recurrence of 16805 code, warm up catalyst bank 1 p0421 efficiency below threshold. Much cheaper and easier than messing with replacing a cat.
Thanks for all the advice.
Thanks for all the advice.
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