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I have thrown several codesP0123
P0103
P1238
P1544

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Vehicle: 98 passat 1.8t

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P0103 MAF (mass air flow ) circuit high

P1238 Cylinder 2 fuel injector circuit open

P1544 Throttle actuation potenio meter signal too high

These are disconnection codes, check and inspect the harness when you recieve a code for high signal you are basically disconnected,

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