Catalyst fault code -
Posted 19 February 2009 - 04:03 PM
The car is a Focus 1.6 Zetec and the year is a 2001.
After seeing the emission warning light come on I check the fault code and it always reads
PO420 and this reads to the book as catalyst efficiency below threshold BANK 1
As there seems to be about 20 warning codes that apply to the catalyst can any body tell me what bank 1 means I think it may be the first 4 cylinders as a V8 car would have a bank two ?
There are other warning codes in the book reference the catalyst showing a Bank 2 does
bank 1 and 2 refer to the first and second oxygen sensor before and after the catalyst.
I have checked the whole exhaust pipe and no sign of any leaks were found ?
I reset the warning light and erase the code and nothing happens again until about 100 miles are covered and then on comes the light again.
Hope someone can help.
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