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Check fuel cap sign comes up even replace fuel cap first Canadian tire than original from Pontiac dealer,after reset it sign comes back again and again
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I'm guessing you don't have a lot of mechanical knowledge so I'll try to explain simply. What the mechanic did was he pressed on the schrader valve (it's the valve on the fuel rail for your car on the engine and it looks like a valve stem on your tire- it might even have a black cap on it like your tires). What he was doing was checking for fuel. The car probably started by luck. If you're still having the problem you probably have what's called a dead spot in your starter's solenoid. You should probably replace the starter and have your battery tested at Autozone or somewhere for free
A lot of times, an evap code can be set by running the vehicle with the gas cap off. Also, if the gas cap is faulty, it can set the code as well. You may want to check the cap first (at least it's fairly inexpensive) and make sure it's sealing correctly. You can have the code reset at Auto Zone or Advance Auto Parts. If the code comes back, you may want to consider changing the cap, but make sure you replace it with the correct one. Not all gas caps will do the trick, resulting in the code just coming back. I would recommend purchasing it from the dealer.
open hood and check pcm wiring harness its located in the left back end of the engine compartment looking at it from the front of the vehicle. the wiring tends to become very loose
You should clear the computer by disconnecting the battery for 15 minutes. If the signal comes on again and you have an owners manual-check to see if the car does this for service intervals. Sometimes every 7500 miles or Nissans oil interval (?) the car does this as a reminder. The oil change people are suppose to reset this. If it shows the gas cap again, take it back.
Don't go to the dealer, unless you just have too much money. Call around to tire shops in your area and see if anyone has a "Bar-Tech" tool or a similar device that will reset your sensors for you and HUGE savings.
Your problem is in the evaporative emission system which is designed to prevent the escape of fuel vapors from the fuel system. Leaks in the system, even small ones, can allow fuel vapors to escape into the atmosphere. The light coming on can be caused by one of the following:
1. Defective or loose fuel cap 2. EVAP canister or hose cracked- not connected 3. Purge or vent solenoid defective 4. Vacuum leak at engine
Government regulations require on-board testing to make sure that the evaporative (EVAP) system is functioning properly. The leak detection system tests for EVAP system leaks and blockage. It also performs self-diagnostics. You have tried the easy fix, the gas cap. Finding the leak now will require special equipment and testing procedures, might be better left to a professional.
Please let me know if this information is helpful. Positive feedback is appreciated. Thank You!
look under the back end of the car where the smaller lines come off the fuel filler neck look for any broken, dissconnected,or rusted lines, or sensors follow these lines back to the fuel tank and up to the front of the car and under the hood repair as needed good luck and please rate -jeff
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