Yup, I'd have to agree if all those things check out. Funny I thought there must have been more to the question, when all it asked about was switch noise & codes. Anyway, sounds like you've checked everything, right down to power at solenoid terminal when key cycled to start, so That would be my next step.
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Possible coolant temperature sensor. It relays info to PCM which in turn regulates fuel needed for different engine temperatures. If sensor is faulty, it may be telling PCM that engine is already warm, when it's actually cold and needs a richer fuel mixture.
The click you are hearing is most likely coming from the clutch safety switch, which prevents the car from starting unless the clutch is fully depressed. Some vehicles use a relay to activate/deactivate the safety feature when the clutch pedal is cycled.
The noise may be from a failed throw out bearing on the end of the clutch fork. If it is seized then the smoke will be from red glowing metal of the bearing and the pressure plate fingers . Sorry but it is a box out and new clutch kit (including throw out bearing) and possible clutch fork if it is damaged type of fix.
Clutch plate and pressure plate seem to be too weak to pull the car. To test the clutch plate, park the car on flat surface. Pull the hand brake up, start the car, depress the foot brake pedal, depress the clutch pedal, put the car in 1st gear, press the gas pedal and leave the clutch pedal at once, while keeping the brake pedal depressed.
Follow one of the two following statements:
1. Engine does not shut down and remain start. (Clutch plate, pressure plate and clutch bearing defective - Replace all as a set)
2. Engine shuts down. (Clutch system is OK and does not require any repair).
sounds like you have a throw out bearing out. Put in neautral and depress pedal while idleing if noise starts its throw out bearing in clutch if noise is there when clutch is out in neautral its probly front trans bearing either involves removeing transmission and replaceing clutch assy or front bearing
the leak is probably a separate issue from the noise. is the leak very bad? can you tell if it's engine oil or transmission lube/fluid? most likely the rear main bearing seal needs replacing. the noise is most likely the clutch release bearing. you should replace all components of the clutch assembly which include; clutch plate, pressure plate, release bearing and piolot bearing. also have the fly wheel resurfaced. while the trans is out, you can check the rear main seal and the trans input shaft seal and replace accordingly.
Your noise sounds like it is power train related,If you have eliminated the engine,Since it doesn't make the noise while moving and in neutral. It sounds like a universal joint in the drive shaft.Do you notice a vibration along with the noise?