21+ P0177 Fuel Composition Sensor Circuit Range/Performance. Symptoms of p0177 obd ii trouble code. The fuel composition sensor is also known as a flex fuel sensor (ffs) and measures the the higher the percentage of methanol, the higher the frequency.
Circuit malfunction p0116 engine coolant temperature circuit range/performance problem sensor circuit malfunction p0177 fuel composition sensor circuit range/performance p0178 fuel.
Normally, a gasoline engine should not have more than 10% ethanol alcohol in the fuel for proper operation. P0177 fuel composition sensor circuit range/performance p0178 fuel composition sensor circuit low input p0179 fuel composition sensor circuit high input p0180 fuel temperature sensor a circuit malfunction p0181 fuel. If the pcm receives signals from the ffs that are not within a specific range it will illuminate the check engine light and set dtc p0177. Common causes of p0177 obd ii trouble code.