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 1,000 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
  1. Home
  2. Questions
  3. Egr and evap codes 455 & 405

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: Evaporative Emission Control System Leak Detected (Gross leak, check fuel cap, piping etc): Code P0455

Hello, thank you for writing in. The vehicle is experiencing a leak either with the EVAP system, or pertaining to the fuel tank. A visual inspection of the fuel tank and filler neck can rule out any physical damage in...

Q: Wheel bearings fail & new part can not be found

Hello. I'm assuming you are talking about the front bearings. Greasing and adjusting the wheel bearings is sort of an art. If you don't get it right, you can have repeat failures. Search for a video of how to pack...

Q: What are these codes that appeared on my car?

These codes are related to the engine sensors for mass air flow, idle air control, and the throttle position sensor. It is quite likely, given your mileage, that their sensors have become dirty/clogged, or the sensors have failed. You don't...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.