Live Data
Last reported case: 4 months ago
Based on 7 owner reports, 7 from forums)
What is P0420?
🚗P0420 on 2020 HONDA Fit
This page focuses specifically on P0420 issues reported by 2020 HONDA Fit owners. The experiences and fixes below are from real owners of this exact vehicle.
Symptoms Reported by 2020 HONDA Fit Owners:
corrosionmisfireloss of powercatalytic converter anxietyshort-circuitplastic-meltingfire-starting temperaturesoverheating lightsparksshaky idle with a/c
Parts Often Involved:
catalytic convertersbattery terminalspositive terminalbatterycatalytic converterpostdrive beltfuel injectorswater pumpthermostat
What Owners Say
Real experiences from 2020 HONDA Fit owners
Experiencevia forum_post
“Hey all, I have an 08' Fit with 160,000 miles and a manual transmission. She's been been acting funny for the past few weeks, so my mechanic suggested a valve adjustment based on the symptoms and felt a dealership would better serve me.”View original
Experiencevia forum_reply
“Quote: Originally Posted by Dotthedog You can request the old injectors back. As I understand they are not repairable, but your buddy might say otherwise.”View original
Experiencevia forum_post
“The belt made a noise afterwards but finally went away after awhile. 300 miles and a week later, she throws the P0420 code. I was already going to take her back to the dealership to get her re-checked but they're saying that the issues are completely unrelated.”View original
Experiencevia forum_post
“Hey all, I've had fun trying to restore my car back up to a proper working condition. Long story short, purchased car at 145k miles, its at about 152k miles right now.”View original
Experiencevia forum_post
“Long story short, purchased car at 145k miles, its at about 152k miles right now. I have short drives, but I have done one long distance drive from mid-Texas to mid-Florida.”View original
Experiencevia forum_reply
“It's "always" been my experience that a p0420 code is indeed a failed catalytic converter. I've always replaced O2 sensors (upstream and downstream) and have never had it fix a p0420 code.”View original
Experiencevia forum_reply
“I've always replaced O2 sensors (upstream and downstream) and have never had it fix a p0420 code. Also, every time before the p0420 code, I had misfires first.”View original
Experiencevia forum_reply
“I didn't feel anything wrong with the car at all... The thing is I've been using Chevron gas supposedly with techron (except for the last few months, mostly Marathon gas with Walmart-bought techron mixed in) ever since I got this car and it looked like it didn't help prolonging the life of the fuel injectors at all...”View original
Experiencevia forum_reply
“The P0420 code is probably related to the fuel injector code. U3006-16 is an error code from the ABS unit, complaining about low input (battery) voltage.”View original
Experiencevia forum_reply
“For P219A, you could try running a few bottles of injector cleaner through it (Techron actually works) but you may need new fuel injectors. The P0420 code is probably related to the fuel injector code.”View original
These are real experiences shared by 2020 HONDA Fit owners on automotive forums and communities. Results may vary based on vehicle condition and repair quality.
About This Data
This page aggregates 7 discussions about P0420 from 2020 HONDA Fit owners across automotive communities.
Success rate (0%) is calculated from posts where owners confirmed whether their fix resolved the issue.
Last updated: 9/7/2025