O2 Sensor behind CAT Out
#1
Cruisin'
Thread Starter
Join Date: Aug 2005
Location: Orange County, CA
Age: 40
Posts: 23
Likes: 0
Received 0 Likes
on
0 Posts
O2 Sensor behind CAT Out
I know how to fix the problem, here's the question.
Will not dealing with this immediately have any detrimental effects on my engine. Will the computer overcompensate to a 'safe level' and run a overly rich mixture, or does this O2 sensor just act as a monitor for engine efficiency and combustion makeup?
Essentially, will the ECU change the combustion mix parameters due to a bad O2 sensor?
Will not dealing with this immediately have any detrimental effects on my engine. Will the computer overcompensate to a 'safe level' and run a overly rich mixture, or does this O2 sensor just act as a monitor for engine efficiency and combustion makeup?
Essentially, will the ECU change the combustion mix parameters due to a bad O2 sensor?
#2
Will not dealing with this immediately have any detrimental effects on my engine.
If it can't get a reading of the current data, Id assume it has to have somekind of default data(safe level) that the factory programmed into the first place, and it would use that until the problem is corrected like get a new sensor(to get the most current data again).
So to answer your question, I would assume you may get a richer mixture thus get bad milege. Now if I can only change the default mixture in the software to my own, it would make my life alittle easier.
![Wish](https://acurazine.com/forums/images/smilies/wish.gif)
#5
If you have a defective O2 sensor BEHIND the catalytic converter, it will not affect the fuel flow control for the engine. The rear O2 sensor monitors catalytic converter efficiency only. I assume you have a O2 sensor heater code on the rear sensor. It's difficult to diagnose a faulty sensor otherwise.
Codes P0420 and P0430 indicate the catalytic converter efficiency is not in line w/ expectations, usually the O2 level is moving up and down in line w/ the O2 sensor ahead of the cat. Other things besides a failing cat can cause these codes such as poor combustion or leaks in exhaust manifold.
I had P0420 on a 99 Subaru and simply reset the ECU and code did not return, although the O2 level suggests the cat is not working correctly. OEM cats are very expensive and you want to be dead sure of a bad coverter before replacing.
good luck
Codes P0420 and P0430 indicate the catalytic converter efficiency is not in line w/ expectations, usually the O2 level is moving up and down in line w/ the O2 sensor ahead of the cat. Other things besides a failing cat can cause these codes such as poor combustion or leaks in exhaust manifold.
I had P0420 on a 99 Subaru and simply reset the ECU and code did not return, although the O2 level suggests the cat is not working correctly. OEM cats are very expensive and you want to be dead sure of a bad coverter before replacing.
good luck
Trending Topics
#10
Originally Posted by bustardvan
Sorry if Im thread jacking, but I also got code P0141 from my scanner. The details said O2 sensor in bank 1. Where is bank 1?- Is it on the driver or passenger side? Thanks
good luck
Thread
Thread Starter
Forum
Replies
Last Post
08_UA7_Gr33k
Member Cars for Sale
13
02-11-2016 02:17 PM