ruler242002

I've got a p1131 coming up after rewiring the O2 sensor. is it possible for this code to pop if I switched the signal wires.
truck runs fine when the code isn't present, but starts to run rough after the code shows up. I've replaced the sensor, check the fuel and vacuum systems, cleaned the MAF sensor just running out of ideas. Hoping I just miswired the new connector. Any thoughts?

Cmanjr

Swap the wires in the connector and see if that fixed it. Lol pretty simple besides having to get under the truck to get to the connector

ruler242002

it is pretty simple once you get to it, but can't get to it from underneath. trying to avoid pulling the harness again.

Cmanjr

Oh. Well either way it sounds like a pain, and I've replaced my O2s before and it wasn't fun. Lol

ruler242002

Alright, so I still have a P1131 popping up.
I have checked Fuel and Vacuum pressures, replaced O2, chagered air and MAF sensors, replaced fuel filter and spark plugs, checked coolant temp and levels, changed oil, and rechecked the wiring to the O2 sensor since I had to rewire it.
also I am starting to think that it could be my computer is ****ed as it has a P1000 that has been present for over a year now and wont go away
I am running out ideas of what could be causing any thoughts?

Jbrew

Lots of thoughts, lets see, -

P1131 Lack Of HO2S11 Switch - Sensor Indicates Lean

Since you have the P1000, which monitor isn't completing ?

Did you replace both 02's (upstream)

Have you checked continuity from PCM connector to O2 connector ? Grounds ? Yea , the PCM grounds your 02 via program, but which ground does it use ? It's one of two, well I believe they on the firewall by the battery. There is two.

Is VRef good?

Read here for a quick understanding, Ford (Scorpio)UK-

http://www.fordscorpio.co.uk/ho2smonitor.htm

ruler242002

The P1000 has been a constant for over a year now. the P1131 popped up a couple months ago when i rebuilt my engine. Both upstream o2s have been replaced. I had to rewire the 11 o2 sensor plug because it got ripped out during engine removal. I'm wondering, now, if it may have damaged more than just the connector

Jbrew

Yes but which monitor isn't completing ? It would help knowing, it's the first thing I would check as it may shed light on the problem.

O2 connectors are finicky, but easy to clean and check. Those have to be spotless inside and the correct dielectric has to be used.

But yea, if you can''t answer the troubleshooting info with my last post, it would be a good idea to learn how to do so.

ruler242002

I do not know which monitor isn't completing. any recommendations on how to check that?

I do have continuity between my SIG and GND, though the voltage is way below what normal operating should be. That could be due to not being able to get good contact on the wires

and what do you mean by "VRef"

Jbrew

Where are you checking continuity from ?

Volt Reference. This is why I posted the link for you....to troubleshoot.