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you do not need a code reader to read the codes on this vehicle
you can read them this way which is called flash coding
as for know which senors could be causing this issue that is a big guess as so many can turn the check engine light on and since these parts can get expensive its best to read the code or code numbers set and then you will know what area the problem is in
To access trouble codes, a jumper lead must be fitted to ALDL connector. With the ignition "OFF" connect these two leads together. Turn ignition "ON" but do not start engine. "Check Engine" light will begin to flash code 12. Code 12 consists of one flash, a short pause, then two flashes. After a longer pause, code 12 will repeat two more times. This check indicates that the on-board diagnostic system is functioning. If no other codes are present, the cycle will repeat until the ignition is switched "OFF."If trouble codes are stored in memory, the lowest number code will flash three times followed by the next higher code number until all stored codes have been displayed. The codes will then repeat in the same order until the test lead is disconnected.
that connector is located under the passenger side kick panel near where the dash meets the kick panel
that connector is the actual aldl connector as this is a 1992 older vehicle
without knowing the codes set it can be anything setting the light to be on
i cant even begin to guess on what part is the problem
it may not even be a part it may be a connection or terminal issue
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the code 23 is going to be an air temp reading wrong usually caused by a bad air intake temp sensor or the connection at the sensor
called an IAT sensor also
Circuit Description The Intake Air Temperature (IAT ) Sensor uses a thermistor to control the signal voltage to the Engine Control Module (ECM ). The ECM applies a voltage (4-6 volts) to BLU/BLK wire of the sensor. When manifold air is cold, the sensor (thermistor) resistance is high, therefore, the ECM will see a IAT signal. As the air warms, the sensor resistance becomes less and the IAT signal drops.