The rear reverse sensors operates continually without other vehicles or objects around it, when driving and when parked with the ignition on

There's a red car like on in dashboard that stays on and when I drive it it makes a beeping sound but when I stop at a stop sign it's tops take off and it starts beeping again

Heat temp gauge and fuel gauge ok. But speedo and odo not working

Toyota dealership suggested problem may be "sensor" at time I delivered to dealership. Toyota replaced clutch switch Assy. According to invoice. Car starts a little better (without pushing in pedal so… 

When I tap the brakes the headlights flicker and sometimes when I turn the headlights on bright engine stalls and I lose all lights