Melted and blew the fuse for the O2 heater circuit

Tiny
MWOPOT
  • MEMBER
  • 2002 FORD RANGER
  • 6 CYL
  • 4WD
  • MANUAL
  • 82,000 MILES
Last November my slave cylinder went out. I pulled the trans and replaced it. As I was reinstlling the trans I crushed the plug to the O2 sensor, (motor side), between the trans and engine. I drove it a few months with it disconneced. When it came time to get the smog test done, I made up some wires and connected them to a new O2 sensor with bullet connectors. The repair worked for about 4 months without a problem. Recently the wires fell onto the exhaust manifold, melted and blew the fuse for the O2 heater circuit. I removed my "repair" and replaced it with a new pigtail with the proper plug and another new O2 sensor. I wired it the same way I did with the first repair. Now I am getting 2 trouble codes that confuse me. They are P1131 {Lack of HO2S1 Swithes- Lean (Bank 1, Sensor1)} and P1132 {Lack of HO2S1 Switches- Rich (Bank 1, Sensor 1)}. Could the shorted wires have damaged the ECM or anything else? If not what else could cause the trouble codes?
I am a boat mechanic who loves wrenching on anything, but emissions are not one of my strong points. Any help would be greatly appreciated. Thanks
Monday, October 27th, 2008 AT 11:57 PM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

Codes P1131 and P1132 are due to faulty wiring. It is possible when it got melted it damaged the harness. It likely needs to be replaced.

I have attached the wiring schematics for your reference.

Please let me know of any questions.
Thank you.

https://www.2carpros.com/articles/how-to-check-wiring
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Thursday, October 28th, 2021 AT 9:38 PM

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