I agree as it failed lambda as well it's more likely to be first lambda sensors or possibly air leak. Have a look at values for lambda voltage in measuring blocks with VCDS. They should be changing quite sharply between approximately 0.2-0.7V about once per second. If there is no activity, smaller range or slow to respond then it/they are faulty. But if you keep driving with faulty lambdas for long time that will eventually damage cats.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
Last edited by ainarssems; 5th April 2018 at 02:11 PM.
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