Check Engine Code 72
04-20-2012, 03:49 PM
#1
Junior Member
Thread Starter
Join Date: Feb 2009
Location: Brantford, ON
Posts: 79
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1996
Model: Cherokee
Engine: 4.0 L
Check Engine Code 72
Hey guys noticed my jeep occasionally sputtering out of nowhere. Then my gas mileage went south, lost 100 km to a tank. Then it threw code 72, which is Catylitic converter efficiency. I heard this can be cause by a bad cat or a fouled O2 sensor downstream.
My question is how likely is it being the cat if I had one put on in the last 45000 km? Also if I replace the downstream 02 sensor should I also replace the pre cat one too?
I got underneath and I shook the cat and didn't hear any rattle like I did when I replaced the cat. My exhaust did have a few broken hangers at one point that I welded back up and have been holding since.
My question is how likely is it being the cat if I had one put on in the last 45000 km? Also if I replace the downstream 02 sensor should I also replace the pre cat one too?
I got underneath and I shook the cat and didn't hear any rattle like I did when I replaced the cat. My exhaust did have a few broken hangers at one point that I welded back up and have been holding since.
Thread
Thread Starter
Forum
Replies
Last Post
erupert66
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
11
06-07-2021 01:45 AM
clark40
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
1
08-28-2015 07:11 AM
CCKen
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
3
08-20-2015 08:07 PM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)