Need help with engine code PO156
Thread Starter
|
Senior User
Joined: Jun 2010
Posts: 148
Likes: 0
From: Sodus, NY
Need help with engine code PO156
The Service Engine Soon light is on in my 2001 F-150. I checked the code and got PO156 generic O2; circuit (bank 2, sensor 2). What are the most common things I should look at? The truck appears to be running fine, no driveability issues.
Freshman User
Joined: Apr 2014
Posts: 28
Likes: 0
I got this code on my 05 chevy. Had to replace the cat. If that is what it turns out to be for you and you aren't doing it yourself don't take it to a mechanic. Take it to a shop that just does mufflers. It will be cheaper and usually done better.
Thread Starter
|
Senior User
Joined: Jun 2010
Posts: 148
Likes: 0
From: Sodus, NY
I usually try to fix things myself, so I'm trying to look at and rule out the simple things first. I'm just not sure where to start with this, or how to test certain things properly.
Lead Driver
Joined: Sep 2006
Posts: 7,907
Likes: 143
Well, the code description you got did not tell you anything of value.
On a FORD it is a circuit issue for the rear OX sensor bank 2.
Get under the truck and inspect the connector and the harness for grounds,open or cross with other leads.
It is not an indication of a faulty cat. The codes for this are 420/430.
Cat monitoring is a dynamic observation of switching ratio between the front and rear OX sensors..
The 156 code is an electrical fault detection.
Obviously the cat monitor cannot work with an electrical problem present.
Good luck.
On a FORD it is a circuit issue for the rear OX sensor bank 2.
Get under the truck and inspect the connector and the harness for grounds,open or cross with other leads.
It is not an indication of a faulty cat. The codes for this are 420/430.
Cat monitoring is a dynamic observation of switching ratio between the front and rear OX sensors..
The 156 code is an electrical fault detection.
Obviously the cat monitor cannot work with an electrical problem present.
Good luck.
Hotshot
Joined: Jan 2004
Posts: 19,768
Likes: 1,082
From: St Louis
Here is the list from the PC/ED.
Focus on the downstream driver's side sensor.
Pinched, shorted, and corroded wiring and pins.
Crossed sensor wires.
Exhaust leaks.
Contaminated or damaged sensor.
Crossed sensor wires.
Exhaust leaks.
Contaminated or damaged sensor.
Thread
Thread Starter
Forum
Replies
Last Post
