Mass Air Flow Sensor - Toyota RAV4 Forums
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#1 (permalink) Old 03-07-2012, 06:11 PM
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Mass Air Flow Sensor

My 2006 RAV4 V6 is getting the check engine & VSC & 4WD lights to come on. I took it into Toyota and they said it was the mass air flow reading. They did not tell me the exact code. They recommended changing the K&N Typhoon back to stock. Well, I've had this K&N intake for years and have driven it tens of thousands of miles with no problems. So I don't believe it's the intake. The last few months, the lights would come on like once a month. I pulled the negative off the battery and reattached it after a few hours to clear the codes. Recently it's been happening more often, like once a week. The filter is clean and I have cleaned the sensor. Is it possible the mass air flow sensor itself is bad? Thanks for any feedback.-SB

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#2 (permalink) Old 03-07-2012, 06:17 PM
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I think you need the code from them to further investigate it but sure MAFS' can go bad.

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2008 Base V-6 front wheel drive
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#3 (permalink) Old 03-07-2012, 06:26 PM
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I'm waiting for Carbon to tell me to buy a code reader so I can ask him which type.

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#4 (permalink) Old 03-07-2012, 07:09 PM
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Quote:
Originally Posted by SeriousBlack View Post
I'm waiting for Carbon to tell me to buy a code reader so I can ask him which type.
You don't have a ScanGauge? It's a nice black one. Not the cheapest.

2009 V6 4wd Base
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#5 (permalink) Old 03-07-2012, 07:29 PM
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Quote:
Originally Posted by Carbon View Post
You don't have a ScanGauge? It's a nice black one. Not the cheapest.
No, I don't have one. Is there just a simple code reader? I'm trying to do some searches now. Maybe I'll just run down to a local mechanic for a scan. I want to verify what the Toyota dealer told me is really what is happening. Thanks

Wow, the MAF sensor is not cheap either. Maybe I'll try to clean it one more time.

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#6 (permalink) Old 03-07-2012, 08:08 PM
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From an old Popular Mechanics article:

Eventually, dirt and oily film bake onto the wire, insulating it from the cooler air--and when the engine management computer sees a value for air mass that's too far out of range, it sets an error code. Periodically, there's a cleaning cycle during which the wire is heated to a very high temperature right after engine shutdown. This burns off deposits.

When this cleaning cycle fails to remove all of the contaminants, you're supposed to replace the MAF sensor. According to almost every manufacturer, it's not recommended or even possible to clean the delicate wires. Of course, they're selling those sensors, so their motivation might be suspect. Next time, I'd try cleaning it first--what do you have to lose? I used to use aerosol carb cleaner, but CRC MAF Sensor Cleaner is new and less prone to dissolving other components in the MAF sensor. Do yourself a favor and remove the MAF sensor from the vehicle before attempting to clean it. Also, I'd make sure the air filter housing, air filter and all associated ducting are intact, clean inside and not leaking dirt. This will keep you from needing to clean or replace the MAF sensor anytime soon.

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#7 (permalink) Old 03-07-2012, 08:14 PM
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You want one that can do CAN (Controller Area Network). Code Scanner - Harbor Freight Tools

Cheapest is to go to your local auto parts store and ask to borrow one.

Universal U380 CAN-BUS OBD2 Engine Scanner/Code Reader | eBay , or one of the others via obd scanner | eBay , is probably worth a try.

Did you use this: http://www.autozone.com/autozone/acc...ier=36011_0_0_

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#8 (permalink) Old 03-07-2012, 08:29 PM
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In my neck of the woods our local Autozone store will scan your codes for free.

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#9 (permalink) Old 03-07-2012, 08:37 PM
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Good info guys! I appreciate it. Carbon, that is the exact spray cleaner I used, was it the correct stuff (I was concerned when I read the HP gain)? Actually, I got it at Autozone. Problem with where I live is nothing is really close by. I'll try to get to an Autozone again to do a reading when I get the chance.

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#10 (permalink) Old 03-07-2012, 09:45 PM
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You could try this method: Check Engine Light/VSC & 4WD lights explained


" title="Why Does My Car Lack Its Usual "Getup-and-Go"? - YouTube" target="_blank">Why Does My Car Lack Its Usual "Getup-and-Go"? - YouTube
Pat Goss saying that the MAF does not set a code normally. I don't know if that is true.

" title="CRC Mass Air Flow Sensor Cleaner - YouTube" target="_blank">CRC Mass Air Flow Sensor Cleaner - YouTube
is by CRC on cleaning the MAF sensor.

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