1999 Ford Taurus Error codes in bank 1 and 2 O2 sensors

Tiny
PIFFEDOUT88
  • MEMBER
  • 1999 FORD TAURUS
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 10,500 MILES
A week ago I bought this car and the only error code on it at the time was a p1504 for faulty idle air control valve. The car would stall at redlights and stopsigns, so I took care of it. The car no longer stalls but now it has a check engine light on with a bunch of different codes all pretty much saying lean or rich fuel mixture, and it cant adjust the trim in both banks. The codes showed up before I replaced the iac valve and I havent cleared them yet. Could a faulty iac valve cause these codes or should I look elsewhere like the map sensor?
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Thursday, April 22nd, 2010 AT 10:11 AM

1 Reply

Tiny
BMRFIXIT
  • EXPERT
Vacuum leak is most likely the reason
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Thursday, April 22nd, 2010 AT 5:37 PM

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