LTFT at -12.5%~ -14.9% and P0420 code on 01 Honda

This post has been de-listed

It is no longer included in search results and normal feeds (front page, hot posts, subreddit posts, etc). It remains visible only via the author's post history.

Post Body

Hey there guys, I have a 2001 Honda prelude with a negative long term fuel trim as stated in the title. I have done some research on the forums and Q&As out there. Pretty much hear a bad EGR valve, fuel injector, or MAP sensor could be the cause. After letting the car idle for 20 min I raised the RPM slowly. The STFT would climb back up closer to 0%. My best guess is the MAP sensor is either dirty/broken or perhaps a bad EGR valve stuck closed. Any feed back or insight would rock, and thank you for reading!

Author

Account Strength

100%

Account Age

4 years

Verified Email

Yes

Verified Flair

Total Karma

11,227

Link Karma

1,511

Comment Karma

9,499

Profile updated: 3 days ago

Posts updated: 3 weeks ago

Mr_J---

Subreddit

r/MechanicAdvice

Post Details

We try to extract some basic information from the post title. This is not always successful or accurate, please use your best judgement and compare these values to the post title and body for confirmation.

Posted: 1 year ago
Reddit URL: View post on reddit.com
External URL: reddit.com/r/MechanicAdv...