Edmunds Answers     • docj 05/29/11 1:03 am PST      Codes
P0401,P0402- Faulty DPFE sensor     Known problem,Ford extended
the warranty on this to 5 years or 50 k miles...      Codes
P1131,P1151     Known problem,..Heres the TSB on it     Some
2001-2003 F-150, 2004 F-150 Heritage and 2001-2003 E-150/250
vehicles equipped with a 4.2L engine may exhibit the malfunction
indicator lamp (MIL) on with diagnostic trouble codes (DTCs)
P1131 and/or P1151 (system too lean bank 1 or 2). This condition
may be due to leaking isolator bolts/port gaskets in the upper-
to-lower intake manifold mounting area. This condition is
sometimes intermittent and may not be apparent on a warmed-up
engine.       Perform a self test. If DTC P1131 and/or P1151 are
the only codes stored in the powertrain control module (PCM)
proceed to Step 2. If any additional DTCs are present, follow
normal diagnostic procedures found in the PC/ED Manual.
Remove the upper intake and replace only the port gaskets
(9H486) and isolator bolt assemblies (9