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Author Topic: codes FORDNUT CAFords OG Member # 2348 posted                              I'm working on a 91 ford and would like a link to what codes mean what. Thanks. Posts: 650 | From: Elk Grove,CA | Registered: Jan 2003  |  : Stimson _ Member # 51 posted                              www.corral.net/eec Its your O2 sensor, I forget if 91 is the passenger or drivers side though Posts: 2373 | Registered: Jun 2000  |  : FORDNUT CAFords OG Member # 2348 posted                              thanks Posts: 650 | From: Elk Grove,CA | Registered: Jan 2003  |  : JoeT ¯ Member # 298 posted                                 lean, check grounds (esp. the wiring harness ground that goes from wiring harness to the firewall, orange wire I believe) -------------------- 1984 Ford Tempo AOD--- RIP Posts: 6785 | From: San Jose | Registered: Jun 2001  |  : Stimson _ Member # 51 posted                              If that wire (ground) to the firewall is undone, you'll get codes for both O2's (41 &91). Posts: 2373 | Registered: Jun 2000  |  :

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