Gas Cap Woes The Unlikely Trigger for Check Engine Lights

“check gas cap” is simply the pcm telling you that the evap system won't hold the correct amount of vacuum for the specified time frame. Lear how to diagnose your "check gas cap light" or a check engine light that has EVAP codes. I also explain how the EVAP system works in ... Loose gas cap is just one possible cause of the evaporative system error codes that set the check engine light. The code said its loose gas cap ... Just disconnect the battery for a few minutes, CEL will reset. Otherwise it could take a hundred or so miles. Aftermarket gas caps and Tacomas ... ... Check Fuel Cap message, but it is immediately followed by the vehicle illuminating the Check Engine Light. This means our diagnosis is ... These fuel vapors may trigger errors in the emissions system, which would light up the check engine light. Dirt and Grime that gets into the fuel tank could ... You're probably fine, most likely the engine has the code “vacuum leak (small)” this is because your gascap has a rubber seal around it and ... The Smog Check failure must not be due solely: To an ignition timing adjustment, or. A failed gas cap function test, or. A tampered emissions control system ... Engine Light On? · Don't let a bad fuel cap gasket tank your smog check test. No matter whether your car is old or new you could be wasting money and polluting ... Other related issues that could set off a vehicle's engine warning light include leaks in your gas fill hose, a faulty gas pump seal or gas cap ...