Question

I have following code for 2000 nissan sentra p1490, p1491, p1126 and p0325. Once I did oil change, the "service engine soon" light vanished. It again came back after I did refueling 2 days back. I have seen that somthing is oozing out from the rubber pipe of car a/c near right hand front wheel.

Answer 1

p1126 replace the thermostat.

p1491 vacuum cut valve bypass valve

Possible Cause-

Vacuum cut valve bypass valve

Vacuum cut valve

Bypass hoses for clogging

EVAP control system pressure sensor and circuit

EVAP canister vent control valve

Hose between fuel tank and vacuum cut valve clogged

Hose between vacuum cut valve and EVAP canister clogged

EVAP canister

EVAP purge port of fuel tank for clogging

p1490 vacuum cut valve bypass valve circuit (replace the valve if its not working)

 

P0325 will go away once the other problems are fixed