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

asked by on September 24, 2016

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?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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

Car is vibrating and clanking on start up.

If the car is moved when the engine is cold before it completes its warm-up cycle, then there will be moisture that is drawn into the engine causing the engine to shake and vibrate with a clanking noise. The issue...

Does mass air flow sensor need replacing if unplugged and car shuts off?

Just because the car shuts off when you unplug the MAF, it doesn't mean that it is bad. But it also doesn't mean that it is good. Your car has the ability to adapt to missing signals so unplugging a...

What’s the correct procedure for driving?

Whether you’re an old hand at driving or this is your first vehicle, it pays to know the specifics regarding getting your car out on the road. While it’s not terribly complicated, there are a few things that should be...

Related articles

2012 Toyota Tundra vs. 2012 Chevrolet Silverado: Which One Should I Buy?
Large work trucks are meant for one thing: work! These vehicles are rough and ready, and can handle nearly anything you throw at them, with the exception of a car pool. While they offer two or four door options, you...
A Buyer’s Guide to the 2012 Toyota Prius Plug-In
Toyota Toyota definitely isn’t sitting on its laurels where hybrid cars are concerned. To compete with other electric cars like the Chevrolet Volt and the Ford Focus Electric, the 2012 Toyota Prius Plug-In gives car buyers a higher-mileage vehicle with...
The Best Used Cars to Buy If You're a Farmer
If If you're a farmer, you know that what you need isn’t a used car – it’s a used pickup truck. How else are you going to haul around hay, implements, garden produce, fertilizer, and all the other things you...