hi guys,
i need your help. just recently a service engine soon light came on in my 2000 sentra xe. i went to autozone and they found a P1941 code, however they didn't know what it was. so i went to pepboys and they diagnosed it with the same code and told me it was a secondary switch solenoid circuit malfuncion. then i went to nissan dealership and they told me that the code indicates vacuum bypass valve.
can anybody help me out here. is the secondary switch solenoid part of the vacuum bypass valve. or does pepboys have no idea what they are taking about.
i would appreciate any input before i go see a mechanic.
could this code p1491 by any chance indicate a leaking gas cap?
i found good threads explaining how to read codes on 2003 and up sentras by depressing the accelerator the right way. is there a possibility of reading codes on older sentras such as 2000 without using a obd II scanner?
Slightly off topic but oh well. Has anyone had their check engine light burn out? What is the life span of the check engine light? Of course, just out of curiosity.
well, i dont think that this one has a problem with the gas cap, more than likely pep boys have a generic code reader unlike the consult that nissan techs use. this code is specifically for the vacuum cut valve bypass valve in the evap system. either the valve is not working, is clogged up or a hose is cut. regardless, the sensor monitoring the system does not notice a pressure change when the valve is supposed to be doing its thing, so the code is set. for what its worth, the performance or reliabilty of the car will not be compromised if its not fixed, but if you are in an emission strict state you will have to get it fixed or fined, so id take it to nissan.....unless you are close to lexington kentucky, then i could fix it for you.
I have a friend who is a mechanic.......could you give me suggestions on how to correct this problem (p1941) to let him know. I live in NY and have to get this straighened out!
well, first of all you will need a rack or be able to get underneath your car. then find the evap system, itll look like a few solenoids and a bunch of small hoses towards the back, either right behind your fuel tank or close to it somewhere. then youll have to look at anything faulty, like mud on a vent valve, a cut or pinched hose, something like that. if you see nothing then you may have to take it to a new york certified repair technician. he should be able to diagnose it for you.
faulty Vacuum cut off bypass valves are quite common on 1.8L sentras. I had a 1441 code come up and thats what it was(I think).
bigern45 I haven't replaced it yet. I've been told that it is common to for the screws for th valve to slit on the canister? Also, what is your opinion on using a used valve.(wreckers)
Service Engine Soon: code (P1491)
Linear Mode
