P0430

Test 1 - Test 6:

P0430-CATALYST EFFICIENCY (BANK 2)

When Monitored:
After engine warm up to 147 deg. F, 180 seconds of open throttle operation, at a speed greater than 20 mph, with the engine at 1200-1700 rpm and MAP vacuum between 15.0 and 21.0 inches of mercury (Hg).

Set Condition:
As catalyst efficiency deteriorates, the switch rate of the downstream O2 sensor approaches that of the upstream O2 sensor. If at any point during the test the switch ratio reaches a predetermined value a counter is incremented by one. Three good trips to turn off the MIL.e MIL.

POSSIBLE CAUSES
- Good trip equal to zero
- Visually inspect catalytic converter
- Exhaust leak
- Engine mechanical condition
- Aging O2 sensor
- Catalytic converter