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'02 Lexus IS 300 Mass Air Flow (MAF) Sensor

11/08/2011 9:47 AM

This car has the check engine light on all the time and occasionally the traction control light comes on. The only running problem is slight hesitation off idle occasionally. According to the mechanic the traction control light comes on as an additional light if the first one has been on for a long time or if additional codes/problems arise. The car has an aftermarket intake filter and pipe. The codes that come up are as follows. The first time we had it checked it was - PO771 fuel system to lem book 1 and PO177 fuel system to lem book 2. The dealer service department told us the values with the aftermarket intake were out of range of the sensor and the engine was running slightly lean. The next time it was checked these were the codes - PO440* Evap system fault and PO101 Maf/vat circuit ranger performance. We were told these were caused by the same problem as earlier. The question is where do I obtain a sensor that will work with the intake and what will need to be done for calibration or is there an available retuning program that will compensate?

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#1

Re: '02 Lexus IS 300 Mass Air Flow (MAF) Sensor

11/08/2011 10:14 AM

Try this:

Buy an inexpensive OBDII code reader. Many can be found on the internet under $100 or find an auto parts store that will let you use theirs for free (although I like having my own).

Re-install the factory intake temporarily.

Clear all error codes with you newly acquired OBDII reader.

Test drive the car and if the idiot light does not come back on, you have verified the problem.

Reconnect the aftermarket intake and test drive the car. If the idiot light comes on, you have verified proof positive that the after market intake is the problem.

Next step will be to call the after market intake manufacturer regarding what sensor to use with their product to make it OBDII compliant on your vehicle.

If you are told that nothing is available to remedy the problem by the sales staff, ask to talk to someone in engineering. If no engineering department, ask to talk to someone in Research & Development.

If you hit a dead end on resolving the issue on your present after market intake, try finding another manufacturer who's after market intake is or can be modified via proper sensor installation to be OBDII compliant.

Another option, Google your error codes one at a time and try to find a "Diagnostic and Repair Flow Chart" . I can't guarantee it but you may find something useful.

Lastly, try a Google search of "02 Lexus IS 300 XXXXXX intake problem". "XXXXX" being the aftermarket intake manufacturer name and model number.

Good Luck

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#2
In reply to #1

Re: '02 Lexus IS 300 Mass Air Flow (MAF) Sensor

11/08/2011 11:47 AM

This sounds like a good procedure if only I hadn't purchased the car with the aftermarket intake installed. I will try to determine the manufacturer first and call them as you suggested as they may know of the problem and have a suggestion or cure.

Thanks

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#3
In reply to #2

Re: '02 Lexus IS 300 Mass Air Flow (MAF) Sensor

11/08/2011 12:20 PM

Ah, very good point.

Come back if you don't resolve it, we will take another whack at it.

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#4

Re: '02 Lexus IS 300 Mass Air Flow (MAF) Sensor

11/08/2011 4:02 PM

A GA to Kevin.

You could use an old electricians trick if the car isn't running too badly.

That's a piece of black electricians tape placed over the warning light.

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#5
In reply to #4

Re: '02 Lexus IS 300 Mass Air Flow (MAF) Sensor

11/08/2011 5:21 PM

Hey thanks and I forgot that one about the black tape.

Very inexpensive, instant fix

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#6

Re: '02 Lexus IS 300 Mass Air Flow (MAF) Sensor

11/08/2011 6:05 PM

I would do that but my daughter already drove it with the traction light on once till the tranny was toast over a little problem. That was a quick $2,300 bucks!

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#7
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Re: '02 Lexus IS 300 Mass Air Flow (MAF) Sensor

11/08/2011 8:33 PM

The black electricians tape is a long standing joke here....honest

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#8
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Re: '02 Lexus IS 300 Mass Air Flow (MAF) Sensor

11/08/2011 8:43 PM

Joke?????

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#9

Re: '02 Lexus IS 300 Mass Air Flow (MAF) Sensor

11/09/2011 8:33 AM

No joke here - a few air conditioning service men have proven you can reduce callbacks by gluing the thermometer needle to the temperature the customer wanted it to be! Of course if it gets bad enough the thermometer will be assumed to be broken. What we don't know won't hurt us some have said. Oh , and by the way due to the quantity needed duct tape works better for a straight jacket or gag!

Just due to the circumstances I am looking for an actual fix...

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#10
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Re: '02 Lexus IS 300 Mass Air Flow (MAF) Sensor

11/09/2011 8:09 PM

I heard of a customer who was continually taking his car back because the temperature gauge was not indicating the theoretical temperature he thought it should. Eventually the repair shop dismantled the temperature gauge and bent the needle ..... the owner was none the wiser but now happy!

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#11

Re: '02 Lexus IS 300 Mass Air Flow (MAF) Sensor

11/14/2011 3:30 PM

The Air intake turned out to be a 69 Series Typhoon by K & N. K & N suggested cleaning the sensor with electrical contact cleaner, then checking for vacumm leaks. I cleaned the sensor 4 days ago and so far the check engine light has not come back on. The air filter was over oiled when we bought the car so that is the likely source of contamination. No more hesitation either.

Thanks for the hints.

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#12
In reply to #11

Re: '02 Lexus IS 300 Mass Air Flow (MAF) Sensor

11/15/2011 4:39 PM

Glad to hear it worked out and was an inexpensive repair to boot

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#13
In reply to #11

Re: '02 Lexus IS 300 Mass Air Flow (MAF) Sensor

11/17/2011 1:00 PM

K&N is probably better staffed to diagnose problems like this than many of the smaller companies selling aftermarket automotive items. Glad they were able to help you.

BTW, way back when alternaters were first being used, my boss had a customer with a new T-bird that thought the amp meter should have been further to the right of the center point. The problem was made worse by the fact that the amp meter was to the left of the driver's line of view. After enough BS, the needle was "readjusted" to show better results. And they all lived happily ever after.

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