Engine sign & Air con stop working unconditionally

Your car has two separate problems.

The first problem is that your engine air/fuel mixture ratio is too rich, in other words there is a greater proportion of fuel than optimal. This is evidenced by DTC P0172. This could be due to a dirty mass air flow meter, a leaking injector, or perhaps a failing air/fuel ratio sensor.

The second problem is with your air conditioning system. If it doesn't work, there always is a reason. I accept that reason may not be obvious to you. You need to have the system checked by someone competent to work on hybrid vehicles.

The air conditioning system will be contaminated if equipment is utilized which had previously been used on regular vehicles. This is because the air conditioner compressor oil is very special for Toyota hybrids - it does not conduct electricity. Oil residue from other vehicles may contaminate your car's system.

If there is no such person in your local area then you'll have to learn how to do that service yourself, and buy a set of manifold gauges and a vacuum pump. The system is probably low on refrigerant and the root cause will likely be due to a leak somewhere in the system.

I would suggest if you DIY, you first recharge the system and add dye, to confirm that the system basically is operational. Then when it stops working again, look for the dye stain to figure out where the leak is, and replace the failed component.

Subscribe to the Toyota repair manual website for information about how to do this, the correct high and low system pressures, etc. You may be able to subscribe to the Europe website.

Toyota Service Information