HomeP0420 · Manufacturer wording

P0420 · Manufacturer wording

The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.

P0420 →

Manufacturer wording

Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.

AudiP042000
Catalyst System, Bank1 Efficiency Below" Coolant leak from expansion tank Corrosion inside door module Fuel pressure low

NHTSA 10243976

AudiP042000
Catalyst System,Bank1 Efficiency Below" Check engine lamp, Belt Starter Generator DTC

NHTSA 10241486