Check engine light came on and has the code P0446 for a 1999 Lexus RX300. What should I do first?

5

Asked by Sep 05, 2013 at 03:08 PM about the 1999 Lexus RX 300 AWD

Question type: Maintenance & Repair

I just bought a 1999 Lexus rx300
2 days ago and I took my sister for a
ride in it the night I bought itand I drove over a speed
bump going very slow and next thing
I know the check engine light is on. I took it to an auto part store and they said the code is a P0446 and they dont carry the part so I need to go to the Lexus dealership. I was hoping there was something I could do first to see if I can fix it. Someone said it may be the wrong size gas cap? I dont have a warranty and am hoping this will not be an expensive fix!

7 Answers

P0446 Evaporative Emission Control System Vent Control Circuit Malfunction There will be no obvious symptoms to driver, other than Malfunction Indicator Lamp (MIL) illumination. Causes A code P0446 could mean one or more of the following has happened: Faulty vent valve Open, short or excessive resistance on Vent valve control circuit Blockage of vent valve Bad PCM Possible Solutions With a P0446 OBD-II trouble code, here are some things to try: Replace Vent valve Repair open, short, or resistance problem in control circuit Repair open, or short, or resistance problem in power circuit Replace PCM

5 of 5 people found this helpful.

Doesn't look like a DIY Nagle. But not a MAJOR expense

4 of 4 people found this helpful.

From another site: It very well could be your gas cap. Missing Fuel cap - Incorrect fuel filler cap used - Fuel filler cap remains open or fails to close - Foreign matter caught in fuel filler cap - Vent control valve harness is open or shorted - Vent control valve circuit poor electrical connection - Faulty vent control valve

8 of 8 people found this helpful.
104,405

The same thing happened to my RX300 had to replace the gas cap.

9 of 9 people found this helpful.
70

Happened to me on my RX300. Vacuum hose on the back of the air filter box was not replaced after the air filter was replaced. I have it on again so hopefully an easy fix. Also, the check engine and vsc lights don't come on until about 100 miles after the hose was disconnected. Very common.

7 of 7 people found this helpful.
30

Just had the little engine light come on, checked gas cap it wasn't tight at all, manual says drive 3 times to make it go away, if not get checked at Midas or something.

3 of 3 people found this helpful.
10

Engine light came on 1999 RX 300 with 103K miles. First I was losing two spark plug distibutors as engine was missing. Purchased 6 online for $99.00. Changed those out, very simple and quick. Also after changing them out the overdrive would not wok. Read up and was informed that all sorts of things could be wrong. I fixed the problem. Her is how! First: Cleaned air mass sensor located at the top back of the Air cleaner box. (Ten minutes). As the engine was running smotthly like new) but overdrive was still not working I disconnected the battery. This re sets the computer. I recoonected the battery after 30 minutes and the problem was solved. Toyota or lexus would likely charge you $500 for the two condensors and could also tell you all sorts of other things need fixing. Try these fixes first before taking the car in. David

1 of 1 people found this helpful.

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