Sign in to follow this  

Emissions Fail on nct due to rev issue

Recommended Posts


I failed the nct because the tester wasn't able to keep the revs at about 2800 , he said for the first 10 seconds it was perfect and I was getting the green light, then all of a sudden the revs would drop about 500 and then go back up again.

He thought it might be the lambda, then asked if the car had a maf sensor and said it could be that too 


I plugged in my own reader and I was getting voltage readings and showed them move as I revd 

I'm not sure but does this mean the fault is elsewhere or can they still look to work but cause issues before they actually fail?

Also when I leave the car idle it is perfect, the issue is only holding the revs steady for the test 

Share this post

Link to post
Share on other sites

Anyone got any idea? 

I also have a post cat code P0140 code , the voltage reading doesn't move so that's gone , I don't think it should affect performance

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.

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