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OBD II Fault Code P0420 :

Description of Fault code P0420

CATALYST B1 EFFICIENCY BELOW THRESHOLD

Possible failuer P0420

  • Catalyst failure

Diagnostic Procedure using AutoHex II

  • The data isn t obtained because B-CAN Frame can t be received.
  • The B-CAN System doesn t actuate.

Test Conditions using AutoHex tester

  • When B-CAN Data is sending

Clear Fault codes Conditions

  • The data isn t obtained because B-CAN Frame can t be received.
  • The B-CAN System doesn t actuate.

MIL Status

  • Keyless Access Indicator ON

BMW ECU Programming


Note:

  • AutoHex II is a professional Auto diagnostic.
  • This fault code is a GERENRIC fault code, some cars may change the meaning of this fault code.
    To get the accurate fault code description you may use AutoHex II

More Fault codes:

OBD II Fault Code P0421
OBD II Fault Code P0422
OBD II Fault Code P0423
OBD II Fault Code P0424
OBD II Fault Code P0425
OBD II Fault Code P0426
OBD II Fault Code P0427
OBD II Fault Code P0428
OBD II Fault Code P0429
OBD II Fault Code P042A
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