1987 Ford F150 exhaust gas oxygen sensor

1987 FORD F-150
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SG1099
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Engine Mechanical problem
1987 Ford F150 6 cyl Four Wheel Drive Manual unknow miles

i'm getting code 42.book says exhaust gas oxygen sensor voltage signal always rich (high value) or does not switch. what should i check and where?
Nov 23, 2009 at 2:42 PM
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