02 sensor problem (bank 2 sensor 1) - Ford Truck Enthusiasts Forums



Explorer, Sport Trac, Mountaineer & Aviator 1991-1994, 1995-2001, 2002-2005, 2006-2010 Ford Explorer

02 sensor problem (bank 2 sensor 1)

Reply
 
 
 
Thread Tools Search this Thread
  #1  
Old 03-04-2011, 01:57 PM
whodatsaints whodatsaints is offline
New User
Thread Starter
 
Join Date: Mar 2011
Posts: 1
whodatsaints is starting off with a positive reputation.
Talking 02 sensor problem (bank 2 sensor 1)

Hello everyone

I had the guy at AutoZone scan my car and this is what the printout said:

Fuel trim bank two condition
The ECM has detected a rich or lean air/fuel ratio condition on engine bank 2
If bank one and two are set together suspect a fuel pressure condition or MAF sensor fault

- Failed H02S21 (Heated 02 sensor - Bank 2 Sensor 1)
-Ignition misfire condition
-Engine mechanical condition

Definition: Lack of heated oxygen sensor - Bank 2 Sensor 1 H02S21 switch sensor indicates lean

Explanation: ECM tried to correct for a lean condition - ECM made rich correction but was unable to bring within specifications

Probable Cause: Failed H02S21 Bank 2 Sensor 1
Open or Short circuit condition
Failed fuel pump or blocked fuel filter
MAF sensor failure
Vacuum Leak



Anyway can anyone tell me if I am correct in assume all of these problems stem from the Bank 2 Sensor 1 02 sensor? And if so could you tell me if that is passenger side/driver side and upstream/downstream? I really appreciate any advice as I would like to handle this on my own.

2006 Ford Explorer XLS 6 cyl

Last edited by whodatsaints; 03-04-2011 at 02:17 PM. Reason: car details
Reply With Quote
  #2  
Old 03-04-2011, 02:50 PM
WillFargo WillFargo is offline
Senior User
 
Join Date: Nov 2008
Location: Broomfield, Colorado!
Posts: 170
WillFargo is starting off with a positive reputation.
Does the 06 v6 have dual exhaust? if its dual its on the drivers side, before the cat converter, which is your upstream
Reply With Quote
  #3  
Old 03-04-2011, 07:29 PM
aquanaut20's Avatar
aquanaut20 aquanaut20 is offline
Postmaster
 
Join Date: Aug 2003
Location: BC Canada
Posts: 2,856
aquanaut20 is starting off with a positive reputation.
It has no bearing on whether the vehicle has single or dual exhaust. Each bank of cylinders has an O2, B2S1 is the 1st sensor after the exhaust manifold (pre CAT) on bank 2. In your case that would be the driver side. The designation of the O2 post CAT would be BxS2.

The S1 O2 are used by the PCM to adjust fuel/air ratio, the S2 are only to monitor the CAT efficiency..

Do not assume that you have an O2 issue, use a proper SCAN tool (computer) and read the live data, MAF, O2 and fuel trim. Philip
Reply With Quote
  #4  
Old 03-04-2011, 09:38 PM
shorod's Avatar
shorod shorod is offline
Postmaster
 
Join Date: Jun 2009
Location: Cedar Rapids, IA
Posts: 3,966
shorod has a great reputation on FTE.shorod has a great reputation on FTE.shorod has a great reputation on FTE.shorod has a great reputation on FTE.
I agree with Aquanaut. This probably is not an oxygen sensor issue but rather a vacuum leak.

-Rod
Reply With Quote
  #5  
Old 12-06-2017, 06:31 PM
Tdagg Tdagg is offline
New User
 
Join Date: Dec 2017
Posts: 1
Tdagg is starting off with a positive reputation.
Where is bank 2 sensor 1 on a 02 Ford Explorer xls
Reply With Quote
  #6  
Old 12-06-2017, 09:03 PM
shorod's Avatar
shorod shorod is offline
Postmaster
 
Join Date: Jun 2009
Location: Cedar Rapids, IA
Posts: 3,966
shorod has a great reputation on FTE.shorod has a great reputation on FTE.shorod has a great reputation on FTE.shorod has a great reputation on FTE.
Quote:
Originally Posted by Tdagg View Post
Where is bank 2 sensor 1 on a 02 Ford Explorer xls
Welcome to the forum!

Did you read post number 3 above? I think Aquanaut did a pretty good job of explaining it. Do you have a more specific question?

-Rod
Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
6.7 DTC (Diagnostic Trouble Codes) Sgt93 6.7L Power Stroke Diesel 13 12-05-2017 10:06 PM
2005 Ford Ranger O2 Sensor Whitey Ford Ranger & B-Series 4 04-27-2017 07:43 AM
'98 Expedition "System Too Lean", P0171, P0174 WhyFord 1997-2006 Expedition & Navigator 163 02-17-2017 08:49 PM
4.2 V6 Engine light after pulling spark plugs, got the codes from autozone jbourne84 3.8 & 4.2L V6 1 02-16-2016 11:10 AM
"service engine soon" light on after pulling spark plugs jbourne84 1968-2013 Full Size Vans 3 02-02-2016 08:06 AM


Go Back   Ford Truck Enthusiasts Forums >

Tags
02, 06, 2007, 54l, bank, bank2, expedition, f150, ford, h02s21, sensor, sensor1, spor, trac, v6

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump


All times are GMT -5. The time now is 01:19 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.