Question about 2003 Audi A6
No, it's either a clogged catalytic converter or, more likely, a bad secondary O2 sensor on the driver's side. The secondary sensor is the one after the catalytic converter, which is used to measure its efficiency. When that sensor fails, the computer can't judge how well the cat is working and often throws a code such as this. However, it should also throw a failed O2 sensor, sensor 2 bank 2, at the same time. You may have a bad cat, but if it comes down to replacing parts, I'd do the sensor first - it's about 15% of the price of a cat.
You could take the two secondary sensors and swap them - move the left side one to the right side and vice versa, clear the code, then scan the car again after running and see if the code comes back the same. If it does, your cat is bad. If it comes back reading a problem on bank 1, it's the sensor.
Posted on Oct 03, 2008
a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
May 22, 2015 | 2006 Toyota Tacoma
Sep 04, 2014 | 1994 Geo Prizm
Jun 10, 2014 | 2005 Kia Sedona
Nov 04, 2012 | Chevrolet Epica Cars & Trucks
Nov 04, 2012 | Cars & Trucks
Feb 14, 2011 | 1998 Mercury Grand Marquis
Feb 18, 2010 | 1997 Mercury Mountaineer
Feb 18, 2010 | 2000 Toyota Celica
Feb 08, 2010 | 2002 Mazda Millenia
May 11, 2009 | Chevrolet Silverado 1500 Cars & Trucks
432 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: