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I've got these codes coming up every 100ish miles. The car is running scorpion 200 cell cats. I know these codes are to do with the cats efficiency. Are they brought up by the probes/sensors that a stage 2 engine map deletes/codes out or are they showing up some other problem? Both always come up at the same time. It's on an a3 3.2 so essentially the mk5 engine gubbins.

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16804/P0420/001056 - Catalyst System; Bank 1: Efficiency Below Threshold
Possible Causes
Leakage in Intake and/or Exhaust System
Catalyst faulty
Oxygen Sensor(s) faulty
Oxygen Sensor(s) Control faulty
Possible Solutions
Check Intake and Exhaust System for Leaks
Check Catalyst
Check Oxygen Sensor(s)
Check Oxygen Sensor(s) Control
Perform Oxygen Sensor(s) Aging Check
 

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I get this on a mk4 R32. I'm running milltek 200 cel cats and supposedly according to awesome the previous owner had an APR stage 2 map. Although last time it stayed off for ages then only came up with the 420 code which is bank one!

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