Code for po446 1999 lexus gs300

It's often a loose or defective gas cap causing the trouble with Evap systems but that usually brings in a P0449. There's a leak in the vacuum circuit between the intake manifold and the fuel tank that causes P0449. A little background on the system: This code deals with the "Evap" code group. Evaporative Emissions. The engine vacuum is used to place a vacuum on your fuel tank to prevent the harmful fumes from being released into the atmosphere. Instead the fumes are run through the engine, being burned and after going through the catalytic converter are considered much less harmful to the environment. Also part of the system includes a vent valve and solenoid. The vent valve is responsible for helping control the level of vacuum in the tank. The solenoid is electronically controlled and used to also control the level of vacuum in the tank. There is a sensor in the tank that provides feedback as to the vacuum level. Any of these items being defective will bring in your code. Rock Auto offers a replacement solenoid for around 30 dollars. If you wish to avoid taking it in and want to try throwing parts at it, that's the easiest to try. It's called and "evap solenoid" It will be on top of your intake manifold, seen after removing the cover and have 2 wires going to it. I often see the plug have a red wire retainer on it. It will be plugged into a black cylinder shaped piece with 2 vacuum connections, one in and one out. There is a white clip on the connection. Push on one side of that white clip to release the vacuum connections. Best of luck. It's often a loose or defective gas cap causing the trouble with Evap systems but that usually brings in a P0449. There's a leak in the vacuum circuit between the intake manifold and the fuel tank that causes P0449. A little background on the system: This code deals with the "Evap" code group. Evaporative Emissions. The engine vacuum is used to place a vacuum on your fuel tank to prevent the harmful fumes from being released into the atmosphere. Instead the fumes are run through the engine, being burned and after going through the catalytic converter are considered much less harmful to the environment. Also part of the system includes a vent valve and solenoid. The vent valve is responsible for helping control the level of vacuum in the tank. The solenoid is electronically controlled and used to also control the level of vacuum in the tank. There is a sensor in the tank that provides feedback as to the vacuum level. Any of these items being defective will bring in your code. Rock Auto offers a replacement solenoid for around 30 dollars. If you wish to avoid taking it in and want to try throwing parts at it, that's the easiest to try. It's called and "evap solenoid" It will be on top of your intake manifold, seen after removing the cover and have 2 wires going to it. I often see the plug have a red wire retainer on it. It will be plugged into a black cylinder shaped piece with 2 vacuum connections, one in and one out. There is a white clip on the connection. Push on one side of that white clip to release the vacuum connections. Best of luck.