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P0178 Diagnostic Trouble Code Discussion for October 2004

Fuel Composition Sensor Low Frequency

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Trouble Ticket Help Requests for DTC P0178
Help Request Posted
2001 GMC Sonoma SL 2.2L MIL Lamp on VIN: 1GTCS14591
P0178: Fuel Composition Sensor Low Frequency. Vehicle came in with P0178 P0179. Ran trouble tree and came down to replacement of FCS sensor approx 600 coco's. The code P0178 resets hard after 15 secs which is consistant with diagnostic tree info (12.5 secs.) I Have ingition feed, 5 volt, and ground at all...
October 19, 2004