how do i fix my car with a p1800 code and a p0021 code? it is a 2002 nissan altima v6 5 sp manual trans. thank you
P1800 vias control solenoid valve is most likely not working correctly, check to see if there is broken or cracked hoses before replacing the valve
P0021 is Intake valve timing control solenoid valve bank 2
if its when over 3500 miles since you replaced the oil, replace the oil first. If the oil is dirty it can clog the valve. You can reset the code and drive the car if the light comes back on you can remove and valve and clean it with brake cleaner only. If that does not fix the problem the valve will need to be replaced.
36.2k questions
32.2k answers
1.3k comments
22.8k users