Skip the auto shop - Our mechanics make house calls

Q: I have a code reader and it show P0446 mod$10 1 of 1 evap emission control system

asked by on

Hi, I will like to know more information of parts & labor, and what would happen if the quote you give on here will be different of his quote for labor and parts? The quote in the internet don't give you much detail about the parts; or what happen if is something else that he find is the prblem, how this work? Do I have to go back in the internet and book another appointment?

My car has 172000 miles.
My car has an automatic transmission.

Hi. Diagnostic Trouble Codes do not identify the parts that are faulty. Codes merely set as a consequence of the Engine Computer receiving out of range data. If a wire is corroded in a multiplexed "system" with ten sensors the computer will receive "out of range" data for all ten even though not a single sensor is faulty and the entire problem is a loose wire. Codes are even set as a consequence of almost completely unrelated systems failing. What you need is a Diagnosis and that merely starts with the Code as a clue to where to look and what to look at. The Code P0446 could be set as a consequence of a broken wire or, in the worst case, be a consequence of a faulty PCM. The faulty wire will cost you nothing to fix if that is the problem and you find it. No matter how handy you are, the PCM will cost about $300 or more plus programming. No one can give you an estimate of the cost to repair unless a Diagnosis is performed preferably by somebody who is highly experienced. I encourage you to contact YourMechanic, get it diagnosed properly, and make sure that diagnosis is explained to you well enough that you are confident in the diagnosis. Regardless of who repairs it, do NOT replace any parts unless there is specific test data (preferably shown to you) that clearly condemns the part. Working on a car is just like working on a body...no parts are replaced unless you are sure! Hope this helps.

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
  • Home
  • Questions
  • I have a code reader and it show P0446 mod$10 1 of 1 evap emission control system

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: Creeking sound from the front side of my vehicle on rough roads

Hello. Your issue is likely related to the suspension or an issue with the wheel. There are a lot of components related to these systems, and you will need to perform several tests in order to pinpoint the location of...

Q: Leaking brake fluid

It is possible that the brakes have worn to a point that the caliper piston has moved past where the seal is located on the piston and is allowing fluid to escape. If it is leaking on a drum brake,...

Q: Ac not cold

Quite often, issues with maintaining cold air flow with an air conditioner are due to a commonly overlooked issue - charging AC refrigerant. Although most vehicles (like your Toyota 4-Runner) have a closed-loop AC, when a leak occurs and...

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...
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...
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.