Sign in to follow this  
Paul1234

PO171 and PO420 codes

Recommended Posts

hi all im new here so hope im posting in the right place. First off i have recently brought a mk2 focus 1.6 petrol which is having a few problems, the car seems to run and drive fine other then on the odd occasion when it starts to die, the car will start straight back up without any problems, ive had the eml checked and its giving out 2 codes, the first being PO171 and the second is PO420, if anyone can give me a bit of help as to where to start looking i would be very grateful, thanks Paul.

Share this post


Link to post
Share on other sites

The link below outlines all the DTC that you can find on Fords and other vehicles:
 


Your codes relate to:

  • P0171 System too Lean (Bank 1)
  • P0420 Catalyst System Efficiency Below Threshold (Bank 1)

What this is likely to be is the MAF Sensor being dirty or malfunctioning. You can search this forum for the exact location for your vehicle and how to go about cleaning it.

Share this post


Link to post
Share on other sites

Ok thanks dansallis, i will investigate further and clean maf sensor, and post back results, thanks again. Paul

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.

Sign in to follow this