Rick's Free Auto Repair Advice

Posts Tagged: FCS

P0179 GM Vehicles

Fix code P0179 on GM Flex Fuel Vehicles If you own a GM Flex Fuel Vehicle and get a P0179- Fuel Composition Sensor (FCS) out of range, along with a whole host of misfire and oxygen sensor related codes, focus all your attention on the problem prone FCS first. The FCS sensor is designed to detect how much ethanol is in the gas so it can recalibrate spark timing and air/fuel ratios. Start your diagnostics at the FCS on the left frame rail. Disconnect the electrical connector from the sensor. … Read More


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