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getfocusworking
Can anybody help with a fault code that I keep getting about once a month and seems to happen under all types of driving.

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

[b][/b]PO420[b][/b] and this reads to the book as [b][/b]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.
SierraYankee99
Possibly a lamda sensor going down??


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