• Get Your Club gear
      Get Your Club gear
    • Share Your Car Experience
      Share Your Car Experience
    • Savings Up to 15% Off For Members
      Savings Up to 15% Off For Members
    • Huge Range of Ford Parts
      Huge Range of Ford Parts
    • Join Premium & Save
      Join Premium & Save
    • 1000's Of Fords For Sale
      1000's Of Fords For Sale

AdBlock Warning

Parts of this website do not function properly with AdBlock enabled on your device. To get the best user experience on our website, please disable Adblock for this website (domain) on your browser.

Sign in to follow this  
Followers 0

Catalyst fault code -

2 posts in this topic

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

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.

Share this post

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  
Followers 0