They forget to check it before buying a car.

Before buying a used and aged car, people often forget to check commonplace things. Which can then pull out unnecessary expenses for repairs from the new owner of the car.
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Error codes:
00 - No errors
11 - the Air temperature sensor in the cabin
12 - Ambient temperature sensor
13 - the Evaporator temperature sensor
14 - the Coolant temperature sensor
21 - Sunlight sensor (passenger side)
22 - Compressor blocking sensor
23 - Pressure sensor (refrigerant)
24 - Sunlight sensor (driver's side)
31 - Air mixture flap position sensor (passenger side)
32 - the Air intake flap position sensor
33 - Air Outlet Damper Position Sensor Circuit
41 - Air mixture flap servo (passenger side)
42 - Servo drive of the air intake damper
43 - Air Outlet Damper Control Servo Motor Circuit
46 - Air mixture flap servo (driver's side)
51 - Compressor Solenoid Circuit
62 - Air humidity sensor (not in Camry)
71 - A / C Inverter High Voltage Power Resource System Malfunction
72 - A / C Inverter High Voltage Output System Malfunction
73 - A / C Inverter Start-up Signal System Malfunction
75 - A / C Inverter Cooling / Heating System Malfunction
76 - A / C Inverter Load System Malfunction
77 - A / C Inverter Low Voltage Power Resource System Malfunction
97 - BUS IC Communication Malfunction
98 - Communication Malfunction (A / C Inverter Local)
99 - Multiplex Communication Circuit
Codes 21 and 24 can pop up if the diagnosis is carried out in a dark room or at night.