PROBLEMATION EXPEDITION

How such friends of MDM because here bothering them again because I have a problem with an American expedition of 8 cylinders model 2001 The problem is that sometimes fails and marks little and sometimes it works in perfect condition and when it marks the P1131condigo and the gas filter already changed the pump and wash injectors 2 times and nothing

This code is due to an anti contamination system, or catalyst, zonda o2
312 284 3960 (Colombia call

I have the same problem, publish the solution please, I'm from Mexico

Something similar happened to me; The code refers to oxygen sensor, in my case I checked them (O2) and they were fine. Check the entire ignition system and find a spark plug with a small crack. Change them all and solve the problem

Thank you very much, indeed the problem is of the spark plugs, I spoke with the plant and the spark plugs that installed cause the fault so they changed the type of spark plug and everything was corrected.