Hi i own a Dodge Magnum2005 2.7L and a get a chech engin light , i have scanned the code and its P1400 (EGR evap sensor low voltage) i have replaced the Egr sensor with a new and reset the code ,but only after driving or 5 min its on again ,i have no vakum leaks, so a took the cables of and mesure the 2 cables and a have good ground and 12v+ on the other cable ,but if a plug it in the egr sensor the voltage disapers when a mesure it ,i have ground but no voltage ,,if a plugg it out a have 12v+ on the cable ???
Should it bee like that ?
What voltage should it have and were does it come from

Please ?????

 

did you change the EGR solenoid on the cylinder head or the EVAP sensor on the firewall?

 

hi i changed the evap sensor

 

a lot of time the evap code is from a loose or bad gas cap. also check to two vacuum lines from the evap sensor and make sure there are no leaks

 

Hi i tried a new gas cap but the code came back in 1 mile , when a suck in the hose that goes to the gastank a cant suck vacum is that right?? i have checked the 2 wires that goes to the evap sensor and the 2 cabels goes to the pcm ,and the cables is good!
Whats the problem???????????

 

And when a try to blow in the hose that goes to the gastank a can blow forever and it sounds like some air is coming out some were under the car ,is that right???

 

i would check the lines vent lines that run along the floor boards back to the tanks. i believe there is also a purge valve by the charcole canister. i will have to look at the complete evap system to see what else could go wrong.