Q: Check Engine Light is on - code P0455

asked by on

My car had check engine light on and it was code P0455. I had the fuel pressure regulator and the purge valve replaced. I also replaced the fuel cap three times. Two days after the repairs the engine light came back. Now that it has been nearly a month after the repairs, the engine light turned off by itself as I was driving in the highway. My question is does it take time for the car computer to detect the new replaced parts? Is the problem still there even if the light is off or was there no problem with my car after all? I checked under the car many times, there is no fuel smell, no damaged hoses or fuel line, the canister is in great condition. By the way, one day as I was in a red light, the car RPM went down and the car turned off, but restarted with no problem. Does this has anything to do with code P0455.

My car has 82212 miles.
My car has an automatic transmission.

Hello. P0455 is the trouble code for a large leak detected by the evaporative emissions control system. The computer will set off this code if it detects a large leak in the evaporative emissions (EVAP) system. The EVAP emissions system is an emission system found on most modern vehicles. It’s purpose is to reduce the vehicle’s fuel vapor emissions by collecting them for ingestion by the engine. The system uses a serious of sensors and valves to monitor, collect, and purge the fuel vapors, reducing overall emissions levels.

In regards to time having to pass for the computer to detect repairs, yes, in some cases the vehicle will have to be driven for a few cycles before the computer detects that the issue is gone. If the repairs were made and the light has turned off on it’s own, then it is likely that the issues are resolved. If they were not, the light would not turn off or would come on again. In regards to your stalling issue, in most cases an EVAP code will not cause stalling. Usually, stalling is caused by a fuel or engine management issue.

If the stalling persists, I would have a professional technician, such as one from YourMechanic, come to your location to determine why the car is stalling and make any repairs necessary to get your car back in working order.

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. Check Engine Light is on - code P0455

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: Where is the TCC Solenoid location on a 97 cavalier?

The TCC solenoid location is in the front of the transmission on the top of the valve body (brain of the transmission) in the side pan. If you need further assistance with your TCC solenoid location or replacement, then seek...

Q: Broken power window

A power window that does not function correctly can be the result of lack of battery voltage. This could be due to such things as a blown fuse or a failed window switch. It is also possible that the window...

Q: Car shuts off when the weather is hot

Hello. A bad cam position sensor will cause a Check Engine Light to come on and possibly cause a stall or no start condition for your 2000 Mercury Mystique. Cam position sensors usually develop their problems when hot, so this is likely...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...
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...