16806/P0422/001058
From Ross-Tech Wiki
16806/P0422/001058 - Main Catalyst: Bank 1: Efficiency Below Threshold
Possible Causes
- Oxygen Sensor(s) defective
- Oxygen Sensor(s) Control defective
- Catalyst faulty
Possible Solutions
- Check Oxygen Sensor(s)
- Check Oxygen Sensor(s) Control
- Perform Oxygen Sensor(s) Aging Check
- Set Readiness
Special Notes
- For 1.8T's experiencing a similar fault code, this thread may be useful: http://forums.vwvortex.com/zerothread?id=663057