Skip the auto shop - Our mechanics make house calls

Q: Egr and evap codes 455 & 405

asked by on

Car hesitates on acceleration sometimes and surges on highway sometimes not all the time. I replaced egr valve cleared codes and two days late there back. I came to a stop once and the car stalled. I even replaced the fuel cap. How do I pin point the problem without spending a fortune replacing parts? Could it be purge valve or vent solenoid?

My car has 103000 miles.
My car has an automatic transmission.

The trouble code P0405 is for the EGR sensor. This code indicates that the sensor is not giving correct voltage readings. You’ll need to replace the sensor and the sensor hoses. The hoses can clog or burn through which causes EGR malfunction.

Trouble code P0455 is for a leak in the purge vapor system and is for a major leak. This is caused by a leaking gas cap or a leaking purge valve in the engine compartment. Test the system using a smoke machine or run the engine and see if the purge valve leaks vacuum during idle. You can check this by disconnecting the vapor line that goes to the valve from the tank to see if it leaks. Afterwards, replace these components and clear the codes.

If you need some help with this, consider YourMechanic, as a certified technician can help diagnose your trouble codes firsthand and help you get your car running normally again.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: check enginelight is on and the gas range fluctuates often even after i changed the gas cap and had a smoke test done

Codes can't be the "basis" for replacing ANY part on a car. Codes ONLY provide clues to mechanics as to the origin of a fault and the ONLY use of these clues is they permit identification of the parts and...

Q: How do I turn autolock on or off?

The autolock feature automatically locks your doors when your vehicle begins moving. This feature can be turned on or turned off by following these steps: 1. Press the Up/Down buttons on the steering wheel until Settings is displayed on the...

Q: wont go faster 35mph

If the Check Engine Light is on this would be helpful as the codes that would be triggered by this would generate useful information relating to the problem. Without the benefit of hooking the car up to a scanner and...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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 to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...