Live Data
Last reported case: 1 weeks ago
Based on 3 owner reports (3 from Reddit)
What is P0420?
🚗P0420 on 2015 FORD F-150
This page focuses specifically on P0420 issues reported by 2015 FORD F-150 owners. The experiences and fixes below are from real owners of this exact vehicle.
Symptoms Reported by 2015 FORD F-150 Owners:
check engine lightrough idlevacuum leaks
Parts Often Involved:
sensor 2map sensorsvalve cover gasketcatalytic convertersensor 1o2 sensor bank 2maf sensorpcv valvebank 1 sensor 1o2 sensor
What Owners Say
Real experiences from 2015 FORD F-150 owners
Fixed Itvia reddit_post
“Finally fixed my P0420 catalyst efficiency below threshold code! I have a 2018 F-150 3.5 EcoBoost with 85,000 miles.”View original
Fixed Itvia reddit_post
“2018 F-150 P0420 Code - What fixed it for me Finally fixed my P0420 catalyst efficiency below threshold code!”View original
Warningvia reddit_post
“Code came back after 50 miles. Then I cleaned the MAF sensor with CRC MAF cleaner - no luck, still getting the code.”View original
Fixed Itvia reddit_comment
“Ended up being the catalytic converter, $800 at the dealer. Fixed the problem though.”View original
Fixed Itvia reddit_comment
“Fixed the problem though. Lesson learned - start with the cat on P0420.”View original
Cost Reportvia reddit_comment
“Replaced O2 sensor bank 2 sensor 2 - still there. Ended up being the catalytic converter, $800 at the dealer.”View original
Experiencevia reddit_post
“2015 F150 3.5 Ecoboost P0420 P0430 I have a 3.5 ecoboost 155k, it threw a P0420, I reset the code and drove for about 60 miles and then it threw an 0420 and an 0430.”View original
Experiencevia reddit_post
“I have a 3.5 ecoboost 155k, it threw a P0420, I reset the code and drove for about 60 miles and then it threw an 0420 and an 0430. Truck doesn’t appear to have any vacuum leaks or exhaust leaks.”View original
These are real experiences shared by 2015 FORD F-150 owners on automotive forums and communities. Results may vary based on vehicle condition and repair quality.
About This Data
This page aggregates 3 discussions about P0420 from 2015 FORD F-150 owners across automotive communities.
Success rate (67%) is calculated from posts where owners confirmed whether their fix resolved the issue.
Last updated: 1/13/2026