code 0420 and 0430
#2
08-01-2005 | 04:07 PM
Senior Member
Joined: Aug 2005
Posts: 220
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From: California
P0420 - Catalyst System Efficiency Below Threshold (Bank 1)
P0430 - Catalyst System Efficiency Below Threshold (Bank 2)
Ford states that a P0420/P0430 can not be caused by the O2 sensors. Make sure that your air/fuel filters are OK and the engine is getting up to proper operating temperature. Your computer has an "adaptive stratagy" that actually "learns" the driver's driving habits including transmission shift points, etc. so when you cleared the codes by unhooking the battery,it went back to a relearning mode which might account for your fuel mileage drop.
Finally, as stated in many threads before, most Cats are covered 8 years/80K miles under emissions warranty.
P0430 - Catalyst System Efficiency Below Threshold (Bank 2)
Ford states that a P0420/P0430 can not be caused by the O2 sensors. Make sure that your air/fuel filters are OK and the engine is getting up to proper operating temperature. Your computer has an "adaptive stratagy" that actually "learns" the driver's driving habits including transmission shift points, etc. so when you cleared the codes by unhooking the battery,it went back to a relearning mode which might account for your fuel mileage drop.
Finally, as stated in many threads before, most Cats are covered 8 years/80K miles under emissions warranty.