Jump to content

Sign in to follow this  
Pierre

Warning Lights

Recommended Posts

My Honda Civic August 2012 has had an error code P0420 and Honda replaced an alleged faulty O2 sensor downstream. One replaced they then got the same error code (P0420) stating Cat below threshold. Does the cat need replacing or can it be cleaned. The car does use a lot of oil. Any thoughts or advice?

Share this post


Link to post
Share on other sites
 

My first thoughts are you have a slight exhaust leak before the cat, or even a crack in the manifold.

The only true way to determine this is to either place a rag firmly over the exhaust and listen for escaping air....there's your leak!

Alternatively, if you have a friendly garage, ask them to measure the oxygen levels in the exhaust gases and if much more than 0% to 1%  you have air in the gas which means its drawing it from somewhere and not burning it (post combustion)

Let us know what you find

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
Sign in to follow this  

×
×
  • Create New...