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.

A: Hi. Diagnostic Trouble Codes do not identif...

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 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

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・Save up to 30%

Get a quote

What others are asking

Q: I had a catalytic converter installed in my vehicle in 2013, now I'm being told I need a new one. How long is it suppose to last?

Hello. Most vehicles do not have to have the catalytic converter replaced unless it becomes damaged due to road debris or it overheating severely. With that said, it is possible your car may be running a bit too rich (too...

Q: Tail lights

This sounds like a wiring problem. I think you may have a connection problem under you dash where you moved the wires around. You will need to check to see if something came undone. You could also have installed the...

Q: Fuel pump issues

Hello. There are a couple possibilities including the fuel issue you have mentioned. If you spray additional starting fluid in the intake and it runs longer, then that's a clue that fuel starvation is the problem. See if you can...

Related articles

How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
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 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...