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Forum > Failed Smog Test > Question

2002 Ford F250 Diesel Failed COMP Monitor

OBD2 readout stated everything passed except for one part which was "Comp Inc". I'm assuming this means computer or component incomplete. What does this represent and how can I fix it?

FYI...I just bought this Ford F250 truck last month and just brought it home from diesel doctors after they replaced the engine. This being said, the batteries and all of the electrical on the engine were off and put back on. Is this "Comp Inc" readout common? How do I fix the problem? Thank you!

Answer:

COMP represents the Comprehensive Component Monitor; one of the three continuous monitors which at all times monitor engine emission component status and functionality. Comprehensive component monitoring is used to detect major faults with engine sensors that may cause an increase in emissions. Since you mention your Ford F250's engine was recently replaced, we highly recommend returning to the auto repair shop which conducted the engine replacement and advising them of this matter. It is possible the electrical wiring between the engine (emission sensors) and engine control computer has a fault. A COMP monitor failure is not a common fault. A vehicle with a COMP monitor failure can not pass a smog test. posted by SmogTips Support

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