P0420 emission code
#1
P0420 emission code
I recently had a problem with my Cat. I had a loss of power. We replaced the Cat about 1 month/4000 miles ago with an aftermarket unit recommended by Midas. It runs smooth and everything. However, this week, the check engine light came on. It shows P0420 which is Cat converter efficiency. Should I look at the O2 sensors? Should I take it back to Midas?
#2
Contributing Member
try cleaning the maf real quick then reset the cel light and see if that helps if not time for a new o2 sensor order it from http://www.urdusa.com/
Last edited by Elton; 01-06-2007 at 10:21 AM.
#3
Registered User
Join Date: Apr 2006
Location: Ione, California
Posts: 135
Likes: 0
Received 0 Likes
on
0 Posts
Same thing happened to me. First was the P0420. One week later she threw off a P0171 (Too Lean)Turned out to be the O2. Got it replaced and now she runs beautifully. I could have sworn it was the cat.
Ryan
Ryan
Thread
Thread Starter
Forum
Replies
Last Post
Longbed 90
86-95 Trucks & 4Runners
22
03-11-2019 12:38 PM
Odin
86-95 Trucks & 4Runners
3
09-26-2015 06:56 PM
Boomer8404
86-95 Trucks & 4Runners
0
09-24-2015 01:12 PM