P0430

DTC P0430
Catalyst deteriorated bank 2 Drive cycle C:Signal out of range - below minimum.

Possible causes by suggested order of priority:
^ Catalyst aged.
^ Catalyst contaminated.
^ Catalyst damaged.
^ Catalyst overheated.

Catalyst Aged.
CHECK THE FOLLOWING:
^ The catalyst will appear undamaged. The catalyst element will not rattle if it is moved.
POSSIBLE FAULTS
^ Catalyst no longer functioning.
DIAGNOSTIC HINTS
^ The Motronic ECM flags this fault when the downstream oxygen sensors switch at the same time as the upstream sensors indicating that the exhaust gas is passing straight through the catalyst without being converted. On a correctly operating system the downstream sensors will not switch as fast as the upstream sensors.

Catalyst Contaminated.
CHECK THE FOLLOWING:
^ The catalyst will appear undamaged. The catalyst element will not rattle if it is moved.
POSSIBLE FAULTS
^ The special coating on the catalyst element has become 'poisoned' with a substance that stops the catalyst from working.
DIAGNOSTIC HINTS
^ The Motronic ECM flags this fault when the downstream oxygen sensors switch at the same time as the upstream sensors indicating that the exhaust gas is passing straight through the catalyst without being converted. On a correctly operating system the downstream sensors will not switch as fast as the upstream sensors.

Catalyst Damaged.
CHECK THE FOLLOWING:
^ The catalyst may appear undamaged but the catalyst element may rattle if it is moved.
POSSIBLE FAULTS
^ The ceramic element of the catalyst has broken up due to mechanical or thermal shock allowing exhaust gas to pass through without conversion.
DIAGNOSTIC HINTS
^ The Motronic ECM flags this fault when the downstream oxygen sensors switch at the same time as the upstream sensors indicating that the exhaust gas is passing straight through the catalyst without being converted. On a correctly operating system the downstream sensors will not switch as fast as the upstream sensors.

Catalyst Overheated.
CHECK THE FOLLOWING:
^ Misfire faults stored (Bank B).
^ Fuelling faults stored (Bank B).
^ Evidence of overheating on catalyst. In severe cases there may be evidence that catalyst material has been expelled from the exhaust system.
POSSIBLE FAULTS
^ The ceramic element of the catalyst has been overheated or melted due to over fuelling or misfire allowing exhaust gas to pass through without conversion.
DIAGNOSTIC HINTS
^ The Motronic ECM flags this fault when the downstream oxygen sensors switch at the same time as the upstream sensors indicating that the exhaust gas is passing straight through the catalyst without being converted. On a correctly operating system the downstream sensors will not switch as fast as the upstream sensors.