Q: I fixed what was wrong but check engine light wont turn off

asked by on

I need to pass a echeck to renew my plates but my check engine light is on i went and failed to see what was wrong and got it fixed. But the light is still on after i drove it all week . error code po443 The evap purge solenoid

My car has 170000 miles.
My car has an automatic transmission.

It sounds like you may have an evaporative emissions system leak. Your car has a small purge valve with a purge solenoid in the Evaporative Emissions system that controls the venting of fumes from the fuel tank as these fumes build up inside, particularly when you are refueling the car with gas. The EVAP system prevents fuel vapors from the fuel tank from escaping into the atmosphere. The EVAP system collects and temporarily stores the fuel vapors in the charcoal canister. The charcoal canister is filled with activated carbon pellets that can absorb the fuel vapors. When the engine is running, the fuel vapors are purged from the canister and burned in the engine. The vent control valve (solenoid) controls the flow of outside air in and out of the charcoal canister. The vent valve is controlled by the engine computer (PCM). Normally the vent valve is open. It closes when the engine computer tests the EVAP system for leaks. If a leak in the EVAP system is detected, the Check Engine light will illuminate on the dash and the trouble code related to the problem will be stored in the engine computer. When an air leak is present in the EVAP system, the MAP sensor will not be able to determine the air density, and the MAF sensor will not be able to determine the volume of air, entering the engine correctly. This will lead to an over fueling situation or an under fueling situation depending on the size of the air leak and engine operating speeds and load. This may eventually lead to catalytic converter problems as well as misfiring problems. I would recommend having an expert from Your Mechanic come to your location to diagnose and inspect your vehicle.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. I fixed what was wrong but check engine light wont turn off

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Is there a wire in my car that is only on when the car is off?

Hi there. Check the fuse box for any live circuits with a test light and the ignition switch turned to the off position. Then hook up your exterior lighting system to that port with a fusible link and a toggle...

Q: Car feels like it's spinning tires when I accelerate from a stop

This is caused by the 1 to 2 clutch sealing rings inside the transmission. The transmission should be checked to verify - but this is the most common problem. The transmission will need to be removed and overhauled to be...

Q: My car feels like the brakes are engaging on their own when I am driving

This is normally due to brake calipers sticking. I would recommend having a brake inspection performed to determine the exact cause of this issue. Consider YourMechanic as this can be done at your home or office.

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...