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Old 05-16-09, 10:42 AM
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fordf250

if my exhause manifolds are cracked would that cause my check engine light to come on. becuase some times itll come on and others it wont.
 
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Old 05-16-09, 03:02 PM
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yes, it can......

If the crack is before an O2 sensor, the exhaust gas can leak out, and not be measured. Since your O2 and PCM have no way of knowing that a crack exists, They are fooled into thinking that the Sensor is not doing his Job.
 
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