o2 sensor problems

[chickensofttaco]

i had an incident recently where my cats failed on the drivers side due to what i now think was a blown head gasket. the middle cat got so hot it melted the paint on the bottom of the car! i gutted the cats and then the engine went out. i made a thread about it because the car was so slow and the fine details of the story are in the thread.

http://www.stangnet.com/mustang-forums/threads/my-mustang-is-slow.855791/page-3#post-8614828

i purchased a new engine because the old one started knocking. now it has a problem where its dying on startup and throwing the codes 1130 and 1131 for the front o2 sensors apparently reading lean. i suspect the egr is stuck, a vacuum leak, or ?..

 

[wmburns]

Did you REUSE the old O2 sensors? If so, likely they have been contaminated by coolant.

If these are new O2 sensors, start first with a through review of the wiring harness just in case it was heat damaged.

>>
P1130 - Lack of HO2S-11 Switch, Fuel Trim at Limit

• Electrical:
  • Short to VPWR in harness or HO2S
  • Water in harness connector
  • Open/Shorted HO2S circuit
  • Corrosion or poor mating terminals and wiring
  • Damaged HO2S
  • Damaged PCM
• Fuel System:
  • Excessive fuel pressure
  • Leaking/contaminated fuel injectors
  • Leaking fuel pressure regulator
  • Low fuel pressure or running out of fuel
  • Vapor recovery system
• Induction System:
  • Air leaks after the MAF
  • Vacuum Leaks
  • PCV system
  • Improperly seated engine oil dipstick
• EGR System:
  • Leaking gasket
  • Stuck EGR valve
  • Leaking diaphragm or EVR
• Base Engine:
  • Oil overfill
  • Cam timing
  • Cylinder compression
  • Exhaust leaks before or near the HO2S(s)

 

[1fun281]

i had the 1131 code for 2 years changed the upstream o2 sensor it went away!