hello all, this prius man. jeez. first off, should the ac compressor be running when my defroster are on? it makes the air cold, which is not ideal in the cold weather. secondly im missing a nut and bolt for one of my engine mounts. and finding part #s for this car can be a pain in the nice person at times. maybe someone could help, its the passenger side one on top. finally im suspecting a blown head gasket? or maybe a cracked egr cooler, im burning coolant, no over heating or boiling over out the overflow. i have a p219a i believe it is. what a pain. hope everyone is well
P219a Fuel System Air Fuel Ratio Cylinder Imbalance Monitor The ECM uses the air fuel ratio sensor and crank position sensor to monitor the difference in air fuel ratio between the cylinders caused by differences in injection volume between the cylinders, leakage in the intake or exhaust system, etc. When the air fuel ratios of the cylinders are lean or rich with respect to each other, the ECM determines that a problem is present and stores a DTC. Air Fuel Ratio Sensor Monitoring Method: P219A is stored primarily when a rich side imbalance is detected. When the system detects a difference in the air fuel ratio between the cylinders due to fluctuation of the air fuel ratio sensor output over 1 engine cycle (2 crankshaft revolutions), the system determines that there is a problem. The reasons for the imbalance between the cylinders can be: misfires, uneven fuel supply, uneven air supply. A dirty EGR system can also do its dirty work. Channels with different degrees of contamination provide uneven air supply to the cylinders. In one, the fuel burns well, in the other it does not burn out. Look at this topic, it clearly shows what the intake channel 1, 2, 3, 4 has turned into. Misfire and Air-fuel ratio imbalance | PriusChat
