Jump to content
Do Not Sell My Personal Information


O2 / Maf Sensor, Fuel Trim Fault Finding


Recommended Posts

I have "P0171 Fuel trim too lean (bank 1)".

Inspection of the live data reads:

MAF sensor reading - steady (I believe this means the MAF sensor is probably working OK and does not need cleaning?)

O2 sensor reading - fluctuates between about 0.1V and 0.7V (I believe this is normal operation at idle)?

So, I am stuck to know what to do next?

1. Clean MAF sensor anyway (this seems to be a sensible idea, because it won't cost anything)

2. Replace MAF sensor

3. Replace inlet manifold gasket

4. Replace O2 sensor

5. Replace CAT convertor

6. Something I haven't though of.

Any suggestions please?

Link to post
Share on other sites

  • 1 month later...

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.

×
×
  • Create New...