99 Exp. 5.4 Error Code P1131

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Aug 27, 2008 | 09:17 PM

solley

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99 Exp. 5.4 Error Code P1131

From reading a bunch of threads, it seems I need to check my vacuum lines.

Just need some help on how to do that, where they are, what they look like, etc.

I'm pretty mechanically inclined, but just don't know much about cars. I've changed alternators, oil, and MAFs before, so let me know if you think this is more than I can handle.

Thanks.

Aug 27, 2008 | 09:34 PM

f-150 hot rod

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p1131 code

I believe that is the same code I had for the front o2 on the passenger side of my truck. If that is the only code you have, most likely the o2 sensor is bad/contaminated. What do you have for mileage on your vehicle?

Aug 28, 2008 | 06:54 AM

projectSHO89

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From: St Louis

That code is fairly accurate in indicating a slow/lazy O2 sensor most of the time.

If you have 4X4, good luck getting to it - it's very tight in there.

Steve

Aug 28, 2008 | 06:34 PM

solley

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Quote:

Originally Posted by projectSHO89

That code is fairly accurate in indicating a slow/lazy O2 sensor most of the time.

If you have 4X4, good luck getting to it - it's very tight in there.

Steve

So what do I need to do?

Aug 29, 2008 | 11:07 AM

f-150 hot rod

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I would replace the o2 sensor. I had to take the right front tire off and remove the inner wheel liner on my truck, it gives you more room. I don't know if an expedition would be the same or not. I used a 22mm wrench from the bottom to loosen it. You may have to heat it a little to initially loosen it.