what are the possible faults with these codes

Question

I have a 2004 Nissan quest 3.5L with codes p0011 p0021 p1800 are they linked together and what are the possible component failures ,the engine runs fine but has upper valve train noise ,the timing belt was replaced for this condition but did nothing to help.

Answer 1

Hi there,

The van doesn't have a timing belt, so it seems unlikely that it was changed. It does have a timing chain, and if it was replaced and the timing is off it will throw the P0011 and P0021 codes at the same time. The P1800 isn't a factor. This is for the VIAS solenoid. Most common issue would be the solenoid itself or the vacuum lines not connected properly after the work was done.