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06 300C coded p1521- variable intake solenoid #1 circuit malfunction. is this the air temp sensor?

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No, the P1521 code for your 300C is for Incorrect Engine Oil Type

The ECM has detected an incorrect oil viscosity using various inputs.
Probable Cause[s]:

  1. Incorrect engine oil viscosity
  2. Incorrect oil type
  3. Oil contamination

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