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Ford 4.6 catalyst inefficiency

  • Chadagore1
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5 years 5 months ago - 5 years 5 months ago #44454 by Chadagore1
Ford 4.6 catalyst inefficiency was created by Chadagore1
Im looking for help with a 2014 ford E-150 with a 4.6. Im getting catalyst inefficiency codes but when i look at the pre cat sensors they are dead on 1v. They dont switch. Ive replaced bank one sensor one but this sensor still sits on 1v. Both s1s2 and s2s2 switch constantly. This is my second day working on this.
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Last edit: 5 years 5 months ago by Chadagore1. Reason: adding images

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5 years 5 months ago #44456 by Cheryl
Replied by Cheryl on topic Ford 4.6 catalyst inefficiency
Have you checked the voltage with a multimeter and compare it with scan data for the oxygen sensors stuck at 1 volt??

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5 years 5 months ago #44462 by Chadagore1
Replied by Chadagore1 on topic Ford 4.6 catalyst inefficiency
honestly im not sure which terminal to check on the sensor.

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