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1998 Ford Explorer P1131

Tiny
OHYEA
  • MEMBER
  • 1998 FORD EXPLORER
  • 4.0L
  • V6
  • RWD
  • AUTOMATIC
  • 207,000 MILES
Codes popped up, and is the only code. What shall I do and what exactly does this code mean? Some info, replaced intake gasket and gasket that goes between lower intake and the fuel rail. Had coolant leak in the oil till I tightened lower intake manifold after heat cycle. Ever since no loss of coolant. I did this about 4-5 weeks ago. Maybe the code popped up because I was low on gas?
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Wednesday, September 16th, 2015 AT 8:22 PM

15 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
The means the 0/2 sensor is reporting a lean mixture. That could be anything from a vacuum leak, to low fuel pressure, to a clogged injector to a bad 0/2 sensor.
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Thursday, September 17th, 2015 AT 2:22 AM
Tiny
ALEX_BUENA
  • MEMBER
  • 28 POSTS
Ok thanks, well the code disappeared after putting gas and driving it.
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Thursday, September 17th, 2015 AT 8:50 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
It didn't disappear unless somebody cleared it or disconnected the battery.
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Thursday, September 17th, 2015 AT 9:19 AM
Tiny
OHYEA
  • MEMBER
  • 153 POSTS
I don't know what to tell you haha, I am the only one that drives it and I didn't clear the code. Drove like 30 min highway from work made like 5 min stop at home and came back to no check engine light.
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Thursday, September 17th, 2015 AT 10:33 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Just because the light went out doesn't mean the code is gone. It's still in memory and likely will appear again.
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Thursday, September 17th, 2015 AT 10:56 AM
Tiny
OHYEA
  • MEMBER
  • 153 POSTS
Checked for codes and there is none. I will keep in mind the things you listed. Do you think that code came up because of low gas? Haven't changed my O2s in a long time anyway to tell if good or not? What type of brand I should look at? Thanks.
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Thursday, September 17th, 2015 AT 12:24 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Motorcraft or Denso are the best.
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Thursday, September 17th, 2015 AT 3:05 PM
Tiny
OHYEA
  • MEMBER
  • 153 POSTS
Ok, anyway to tell if they are bad? Looked at my Fuel Trims and they are stuck at -100 and never move. Been like that for a long time. Is that a sign they are bad?
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Thursday, September 17th, 2015 AT 3:25 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
The fuel trims are determined by the 0/2 readings so that's not surprising. You can monitor the 0/2 voltage with either a DVOM or live data on a scanner. Below.500v signals lean. Above that indicates rich. It should constantly cross between rich and lean. If it's reading lean, try to artificially enrich it with some carb cleaner or Propane and see if the 0/2 responds by going full rich.
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Thursday, September 17th, 2015 AT 3:34 PM
Tiny
OHYEA
  • MEMBER
  • 153 POSTS
Which O2 sensors do I replace?
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Friday, September 25th, 2015 AT 9:13 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
The upstream sensors are the only ones that effect vehicle performance.
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Friday, September 25th, 2015 AT 9:38 PM
Tiny
OHYEA
  • MEMBER
  • 153 POSTS
So got the code p0133, guess that can confirm need new o2. How many do I need to buy?
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Friday, October 2nd, 2015 AT 8:56 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
You haven't confirmed anything but changing the 0/2s for maintenance is always a good thing to do. They lose sensitivity over time.
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Friday, October 2nd, 2015 AT 9:30 AM
Tiny
OHYEA
  • MEMBER
  • 153 POSTS
Oh ok, thought when o2 sensors are slow in response it is the beginning stage of failure. Any idea of how many up stream sensor I have to replace? Thanks
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Friday, October 2nd, 2015 AT 9:35 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
It has 2
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Friday, October 2nd, 2015 AT 10:46 AM

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