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Showing a code for all four O2 sensors?

Tiny
JONAH123
  • MEMBER
  • 2006 FORD MUSTANG
  • 4.6L
  • V8
  • 2WD
  • MANUAL
  • 17,000 MILES
I am showing a code for all four O2 sensors. Two weeks ago after a rough drive I had found that a sensor had melted against the exhaust. I replaced the sensor and made sure it would not touch the exhaust anymore. Shortly after replacing the sensor the light came back on and all four sensors were throwing codes. The car runs pretty rough once I get it to about 1800+ RPMs. There is an aftermarket exhaust and headers.
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Friday, December 30th, 2022 AT 6:42 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,690 POSTS
Yep, I have seen this problem before and the PCM is bad, here is the location and how to change it out in the images below. You can get a rebuilt unit by searching Google or eBay. Check out the images (below). Please let us know if you need anything else to get the problem fixed.
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Saturday, December 31st, 2022 AT 1:39 PM

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