I have fault codes po105,p1105,p0100,p0234,what is the most likely cause?

no one can tell you any answers, you must have vehicle scanned for fault codes. Go to autozone for this.
All codes are OBDll and are available on line free
example P1105
P1105 Code - Manifold Absolute Pressure Sensor Malfunction

copy and paste
https://www.engine-codes.com/p1105.html


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code p 0121 is associated with the throttle position sensor and accelerator position sensor
causes are from cable adjustment --throttle position and accelerator position sensors
code p0533 refers to ac refrigerant pressure sensor--high input== causes --ac pressure too high (cooling fault -condenser fan not running at radiator-- too much gas --pressure sensor
p 0105 refers to map sensor / barometric pressure sensor --circuit malfunction===causes wiring--- map sensor --baro sensor ECM
code p0566 refers to cruise control master switch== causes --control switch , ---ECM
code p1582 refers to electronic throttle monitor data available which will be associated with the p 0121 code and faults

P0234 over boost condition has occcurred. press the helpful button
The symptoms displayed for a P0234 code will depend on the cause of the overboost condition: The service engine soon or check engine light will illuminate. You will experience a loss of power. The engine may show signs of overheating. The transmission may show signs of overheating and harsh shifting. Additional codes associated with the condition set by P0234 may be present to help identify the cause. Codes are available for all electrical components utilized by the engine management computer for the control of boost levels. The engine may display signs of pre-ignition in the form of knocking. The engine may display ignition misfiring.
Read more at: http://www.obd-codes.com/p0234
Copyright OBD-Codes.com

P0234 Turbocharger Supercharger Overboost Condition Code

VAG 2 0 TDI turbo P0234 overboost cause

P0234 OBD II Trouble Code
http://www.datsc.com/tabid/122/OBD-Error-Code/P0234/Diagnostics/chrysler/Default.aspx

P0234 is over boost detected.Trouble code P0234 indicates the power train control module senses a dangerously high boost pressure from the engine's forced induction system. Levels of boost over recommended levels can harm engine.
press the helpful button and check links below

OVERBOOST Code P0234 from OBDII Turbo Dodge Forums Turbo Dodge Forum for...

PT Cruiser Forum

P0234 Turbocharger Supercharger Overboost Condition Code

http://www.datsc.com/tabid/122/OBD-Error-Code/P0234/Diagnostics/chrysler/Default.aspx

Google your codes & study

TYPE: OBD PO141

OBD P1105

Codes have nothing to do with sensors or the
need to replace any parts

You use the codes to check the system with the fault
& component test to find a problem

Google your obd codes & see what sensor set a fault code

Type: OBD P1105

Add vehicle model,engine etc-- if you need more to find the issue

Your still going to need a shop to diagnose things from the beginning,you can't throw parts at codes,doesn't work that way

Error Code: P0130
Fault:
Oxygen Sensor (O2S) 1, Bank 1 - Circuit Malfunction
Possible Cause:
Malfunction Indicator Lamp (MIL) Triggered on first occurrence.
-Wiring harness.
-Oxygen sensor (O2S).
-Engine control module (ECM).

Error Code: P0505
Fault:
Idle Speed Control (ISC) System - Malfunction
Possible Cause:
-Wiring harness.
-Idle speed control (ISC) actuator/Idle air control valve (IAC) valve.
-Throttle motor.
-Throttle valve tight/sticking.
-Engine control module (ECM).

Error Code: P0100
Fault Location:
-Mass Air Flow (MAF) Sensor/Volume Air Flow (VAF) Sensor - Circuit --Malfunction
Possible Cause:
-Wiring harness.
-Mass air flow (MAF) sensor.
-Volume air flow (VAF) sensor.
-Engine control module (ECM).

Error Code: P1491
Fault:
Exhaust Gas Recirculation (EGR) Valve Insufficient Lift
Possible Cause:
-Wiring harness.
-EGR Valve.
-ECM

Error Code:P1607
Fault:
-Engine Control Module (ECM)/Powertrain Control Module (PCM)

Error Code: P0966
Location:
-Pressure Control (PC) Solenoid B - Circuit Low
Possible Cause:
-Wiring short to earth.
-Pressure control (PC) solenoid.
-Engine control module (ECM)/Powertrain control module -(PCM)/Transmission control module (TCM) .

code p1105 refers to manifold absolute pressure(MAP) sensor, TC system-leak detected. causes ---intake leak, ---hoses There are to references to p1105 The second response is still map sensor but the causes are---TC system--mechanical fault--air leak between throttle body-TC,map sensor---TC system--exhaust blockage
code p1260 refers to throttle return spring--weak spring force. causes ---mechanical fault,--,throttle control unit
code p1264 refers to throttle valve opening-accelerator released causes ---throttle control unit---mechanical fault

Well po105 is a generic code for map sensor cicuit malfunction.The other 2 codes i dont have a listing for but a bad map sensor will cause grey/black smoke

This code represents an alternator fault. Check the operation of the alternator and it's voltage regulator.