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16805 - Warm Up Catalyst; Bank 1: Efficiency Below ...
https://www.audizine.com/forum/showthread.php/196404-16805-Warm-Up-Catalyst-Bank-1-Efficiency-Below-Threshold-got-this-code-last-nigh
Re: 16805 - Warm Up Catalyst; Bank 1: Efficiency Below Threshold, got this code last. It's most likely an O2 sensor issue. That's where cat codes are generated from, so if the O2's are not reading the difference in upstream to downstream fast enough, you get these codes.. Could be in few cases, but very few.
Warm up catalyst below threshold - OBD-Codes.com
https://www.obd-codes.com/forums/viewtopic.php?t=3195
Warm up catalyst below threshold. Post by dferris40 » Mon Jan 21, 2008 11:37 pm. I have a 2004 Audi A6 Quartro with about 106,000 miles. My check engine light has come on a couple of time indicating the warm up catalyst is below threshold. In addition, I have occasionally noticed a whining sound at very low speeds. It comes and goes and may ...
Warm Up Catalyst Efficiency Below Threshold (Bank 1 AND2 ...
https://www.obd-codes.com/forums/viewtopic.php?t=1650
Warm Up Catalyst Efficiency Below Threshold (Bank 1 AND2! Post by mrmichael112002 » Fri Mar 02, 2007 1:35 am. I have a 2000 audi a6, 100K miles. I have 421 and 431 for bank 1 AND 2 for warm up catalyst below threshold. Does …
P0421 code -- HELP!!! - Car Forums and Automotive Chat
http://www.automotiveforums.com/t254759-p0421_code__help__.html
I've had the P0421 (warm-up catalyst system below threshold) code pulled from my car twice. The first time the shop said that if it came on again, take it to the dealer due to the 8 yr emission warranty.
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