I took my KJ in for service today because the check engine light was on and figured since I was there I would see if they could do my ball joints also. So the looked up all the recalls and it showed that I also needed the F31 and F37. It was my understanding that they had the same flash components. When I got home I had a letter from DCX that said I needed to have the F31 preformed and on the bottom it said I also needed to have the ball joints replaced (F23) and the F37. I am so confused!!!!!!!

The ball joints were loose at 22K miles and the only difference between old and new is an external nylon seal on the sheet metal cover.

The check engine light was for boost pressure and air temp sensor. The tech said it was covered in black goo so he cleaned it off and we will see what happens.

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'06 CRD Sport, Silver build date 09/05
LoTek 2 pod pillar w/60 psi boost guage & egt
CRD Frankinlift, BFG-AT 31-1050/15 on crager soft 8's
Suncoast converter in a rebuilt trans with new pump and shift kit.
Yeah, It's got a diesel.

SOLD FOR GMC PICKUP

F-37 update includes the tranny fix and re-flash which also cover the f-31.
F-31 related to the scan tool problem re-flash

When I had my f-37 done the f-31 was included, but the tech (s/w?) did not put it in the dcx system so it still showed that the f-31 was not done. Next time I went in, they made the change

So does the F31 have anything to do with reduced HP and TQ?

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'06 CRD Sport, Silver build date 09/05
LoTek 2 pod pillar w/60 psi boost guage & egt
CRD Frankinlift, BFG-AT 31-1050/15 on crager soft 8's
Suncoast converter in a rebuilt trans with new pump and shift kit.
Yeah, It's got a diesel.

SOLD FOR GMC PICKUP

read here

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Ryan
2006 Ford F-250 PSD CC FX4
**GONE**
2005 Jeep Liberty CRD
SAMCO Hoses//GDE Tune//PML Trans Pan//TransGo HD Shift Kit//MBRP Exhaust

1986 2R Mustang SVO