Ford Owners Club - Ford Forums Messages

Club Announcements

Ford Fair 2016: Tickets and stand passes are now available to purchase. More info here.

Review your Ford: Help others when it comes to buying a car like yours and review your Ford now

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
getfocusworking

fault code PO420 bank 1

3 posts in this topic

I have a 1.6 Zetec Focus 2001.

Fault code po420 has shown which is listed in the book as catalyst system efficiency below threshold bank 1.

Have reset code a couple of times but shows again.

Can anybody tell me is it best to renew the catalytic converter first or the first and second oxygen ( lamda ) sensors first.

Thanks for any help.

Share this post


Link to post
Share on other sites
 

I'd suggest first getting technical advice from Ford. I'd suggest its just Lamda sensors rather than the cat itself.

Share this post


Link to post
Share on other sites
I'd suggest first getting technical advice from Ford. I'd suggest its just Lamda sensors rather than the cat itself.

Thanks for the advice.

Have taken the two sensors out today and found one had rust on the end of the sensor.

Have cleaned it off but if it lights up again will replace it.

Many thanks.

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