What do these codes mean?


New Member
Nov 26, 2003
I just ran some codes on my 95 Cobra. It came back with 172,173,176,543. I checked the book and it says that the 172-176 codes are "Heated Exhaust Gas Oxygen sensor- voltage signal indicates "rich", Bank 1 and 2. I just ordered new O2 sensors so that should take care of that problem. They are the original sensors. The 543 code reads this, "Fuel Pump circuit open connection- Electronic Control Assembly to battery. I have no clue what this means or how to fix it! Does anyone know what this means? I would appreciate it if someone can give me some info! Thank you!
  • Sponsors (?)

do you have LT headers? If so thats why you got that rich condition code... I dont think theres any way to get around that unless you have an adjustable fuel pressure reg. and turn down the fuel pressure a little bit