How do I fix code p111 on 03 Nissan altima?
Start by replace the oil and oil filter with 5w-30 and use a good oil like Mobil 1 or Pennzoil Platinum or Ultra.
Since the Intake valve timing control solenoid valve uses oil flow to control timing, dirty oil can cause the valve to stuck open or close. Before replacing the valve, change engine oil and filter and reset engine code.
If the code comes back you can remove the Intake valve timing control solenoid valve and clean it with brake cleaner.
https://www.autocodes.com/p1111_2003_nissan_altima_sedan.html
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