Ford Focus Forum, Ford Focus ST Forum - View Single Post - 2000 ford focus zts catalytic converter and mass air overflow sensor
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Old 04-04-2013, 01:58 AM   #20
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I would do a compression test , IACV wouldnt cause this , mass air could

See if you can find a local FF member that has a xcal2 or 3 and send me a datalog and lets see whats happening

The code you set could be a
bad o2 sensor
bad o2 fuse
bad wiring to the o2 from fuse
Vac leak on the engine

I would find the problem then fix it , see if you can barrow a xcal2 - 3

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