Code P1191 - Defender Source
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  #1  
Old October 6th, 2015, 02:01 PM
Tyler Wirken
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Tyler Wirken
1997 Defender 90 LE
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Code P1191

Truck is running crappy today. Had the codes read.

P1191

Looked it up online and it seems to be an o2 sensor. See attached screen shot.

Anyone have any experience with this code? If it is an o2 sensor how do you know which one it is out of the 4 on a 1997?

Truck is suffering loss of power, runs rough and appears to be missing.

Thanks
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  #2  
Old October 6th, 2015, 02:09 PM
ezzzzzzz
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Mark Garrenton
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Downstream means post cat. These do not control fuel trim. That code indicates that both post O2S are not showing any signals so it indicates an open circuit possibility. It could mean both convertors are shot. Do they rattle when idling (usually when cold) or if you thump them with a rubber mallet or fist? If not, then it could mean a failed ECU. What are the symptoms exactly? Did this just suddenly happen?
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Old October 6th, 2015, 04:05 PM
Tyler Wirken
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Tyler Wirken
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Thanks Mark.

It just happened suddenly. Ran fine yesterday and this morning. Then went to doctor and came out and bam running like crap.

Cats are not making noise but I will check them.
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  #4  
Old October 6th, 2015, 04:52 PM
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jafir
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Jafir Elkurd
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That's a heater code
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  #5  
Old October 6th, 2015, 05:07 PM
Tyler Wirken
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Tyler Wirken
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So what would that be Jafir?

Not sure what a heater is. Well I assume it is not the cabin heat.
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Old October 6th, 2015, 11:32 PM
Tyler Wirken
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Tyler Wirken
1997 Defender 90 LE
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Okay so it seems either I have a bad cat or a bad o2 sensor.

Are all 4 of the o2 sensors the same? One site I found has upstream and downstream ones for different prices and places like Atlantic British just show one.

Do I need to buy a downstream one specifically or do they all do the same thing?

Thanks!
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Old October 7th, 2015, 12:07 AM
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jafir
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Jafir Elkurd
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Quote:
Originally Posted by Tyler Wirken View Post
So what would that be Jafir? Not sure what a heater is. Well I assume it is not the cabin heat.
I'm assuming something in the heater circuit for the sensor. The sensors, wiring, fuses, relays, computers, etc.

I wouldn't think a bad cat would cause a heater code.
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Old October 10th, 2015, 04:02 PM
Tyler Wirken
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Tyler Wirken
1997 Defender 90 LE
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Well changed out the O2 sensors downstream and no improvement.

Checked codes again. Two new ones now that were not present the other day.

P0300
P0302

OBDII reader said multiple misfires and misfire cylinder #2

But the P1191 code is gone at least.

It has new plugs and wires as of about 3 years ago so I assume it is either coil packs or injector. Anything else I should look at?

Thanks
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