i have a 2003 chevrolet suburban that reads a code po178 fuel compensation sensor circuit what is that ?
Fuel Composition Sensor (FCS), or Flex Fuel Sensor The fuel composition sensor (FCS), or flex fuel sensor (service parts term), measures the ethanol-gasoline ratio of the fuel being used in a flexible fuel vehicle. Flexible fuel vehicles can be operated with a blend of ethanol and gasoline, up to 85 percent ethanol. In order to adjust the ignition timing and the fuel quantity to be injected, the engine management system requires information about the percentage of ethanol in the fuel.
If required, install the fuel composition sensor to the bracket and install the bolts
what would cause this code po 178 to pop up ?
There are a couple of reasons: 1. Low-quality, inferior fuel was used in the system, which threw the sensor off 2. the sensor iitself is bad. If you are sure low quality fuel was not used, check all connections going to the Flex Fuel Sensor for loose connections or broken wires. Due to its location, its vunerable to read debris and weather elements.
I put a new sensor on and cleared the codes after driving the truck a few minutes the code comes back any suggestions ?
If you changed the sensor already, i would suspect debris from the fuel tank is getting clogged up in the sensor, which is interfering with the proper operation of the sensor.