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O2 sensor failure upstream bank 1

Tiny
CHRIS KINARD
  • MEMBER
  • 2000 FORD MUSTANG
  • 3.8L
  • V6
  • AUTOMATIC
  • 190,000 MILES
Yes, I have replaced my 02 sensor bank 1, 3 times and about one hour after replacing it the obd2 would read that the 02 sensor was bad. Can you tell me why please oh and also these are coming out pn the obd2 reader cat, evap, egr, ozs, htr.
Monday, October 7th, 2019 AT 6:50 AM

37 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

What is the code? Codes rarely identify bad parts. They only identify area of failure.

Once I know the code, I can further help.

Roy
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Monday, October 7th, 2019 AT 8:52 AM
Tiny
CHRIS KINARD
  • MEMBER
  • 83 POSTS
Po135.
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Monday, October 7th, 2019 AT 10:34 AM
Tiny
ASEMASTER6371
  • MECHANIC
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Below are the possibilities for the code. Most likely it is a wiring harness issue.

Check the red/yellow wire in the connector for power with the key on.

Roy

P0135
Descriptor
Ho2S Sensor Circuit Malfunction (Ho2S-11)
Probable Causes
Ground Circuit Open
Harness or Heated Oxygen Sensor (HO2S) Short to Ignition Switched Power (VPWR)
Heated Oxygen Sensor (HO2S) Heater Damaged
Ignition Switched Power (VPWR) Circuit Open
Low Battery Voltage
Poor Mating Terminals and Wiring or Corrosion
Powertrain Control Module (PCM) Damaged
Water in Harness Connector
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Monday, October 7th, 2019 AT 1:17 PM
Tiny
CHRIS KINARD
  • MEMBER
  • 83 POSTS
Yes can you tell me what fuel sys 2 n/a means?
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Monday, October 14th, 2019 AT 4:33 PM
Tiny
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Where do you see that?

Roy
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Monday, October 14th, 2019 AT 4:52 PM
Tiny
CHRIS KINARD
  • MEMBER
  • 83 POSTS
On my obd2 scanner.
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Tuesday, October 15th, 2019 AT 5:28 PM
Tiny
CHRIS KINARD
  • MEMBER
  • 83 POSTS
And im taking my valve covers off do I need permatex on the valve cover groove and do I have to have a torque wrench?
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Tuesday, October 15th, 2019 AT 7:32 PM
Tiny
CHRIS KINARD
  • MEMBER
  • 83 POSTS
And what are the torque specs on the valve covers on the 3.8 v6 2000 Mustang? Please let me know. Thanks
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Tuesday, October 15th, 2019 AT 9:46 PM
Tiny
ASEMASTER6371
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No, replace the gasket and do not use any RTV.

The torque spec is 12 ft pounds.

Roy
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Wednesday, October 16th, 2019 AT 10:57 AM
Tiny
CHRIS KINARD
  • MEMBER
  • 83 POSTS
And do I need a torque wrench for the intake manifold and if so what are the specs?
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Wednesday, October 16th, 2019 AT 11:40 AM
Tiny
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22 pounds on the intake.

Roy
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Wednesday, October 16th, 2019 AT 11:49 AM
Tiny
CHRIS KINARD
  • MEMBER
  • 83 POSTS
Thank you alot God bless you!
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Wednesday, October 16th, 2019 AT 2:57 PM
Tiny
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You are welcome.

Always glad to help.

Roy
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Wednesday, October 16th, 2019 AT 3:15 PM
Tiny
CHRIS KINARD
  • MEMBER
  • 83 POSTS
Hey, can I unplug the PCM the main computer and clean it? Let me know please.
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Sunday, October 27th, 2019 AT 8:13 AM
Tiny
CHRIS KINARD
  • MEMBER
  • 83 POSTS
And I am getting this now:
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Sunday, October 27th, 2019 AT 8:16 AM
Tiny
CHRIS KINARD
  • MEMBER
  • 83 POSTS
And that. Let me know the details please. God bless.
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Sunday, October 27th, 2019 AT 8:17 AM
Tiny
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What did you do to get this code?

This is for bank 1 sensor 2. It is the sensor on the driver's side down behind the converter.

Roy
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Sunday, October 27th, 2019 AT 10:10 AM
Tiny
CHRIS KINARD
  • MEMBER
  • 83 POSTS
Would it be okay for me to hollow out my catalytic converters?
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Sunday, October 27th, 2019 AT 5:51 PM
Tiny
ASEMASTER6371
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No, that is a federal violation and besides, you will set all kinds of codes.

Roy
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Sunday, October 27th, 2019 AT 7:29 PM
Tiny
CHRIS KINARD
  • MEMBER
  • 83 POSTS
Okay, darn I didn't know that.
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Sunday, October 27th, 2019 AT 9:47 PM

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