!
error Innova
Error Code P0420
Catalyst System Efficiency Below Threshold (Bank 1)
? What Causes This
Failed catalytic converter or inaccurate diagnostic system reading.
✓ How to Fix It
Replace the catalytic converter, if confirmed by other diagnostics as faulty. Otherwise, recalibrate or update diagnostic system readings.
Source: page 47 of the official manual
From the manual
This error code appears in:
Innova 3100 OBD2 Code Reader