KonKet

The MAF doesn't need to be cleaned often as it's behind the air filter. I'll be worried if the car has cold air intake, the air filter was installed incorrectly or K&N filter was used. Last time I checked the MAF in a 7 y.o car and found it wasn't dirty at all and there was no apparent improvement after it was cleaned.

matts6887

I need to know for sure whether or not it is safe to use the crc brand maf cleaner because i went to o reilly auto parts earlier today to get some maf cleaner and the only brand they had was the crc maf cleaner but again it says NOT to use use it on Lexus vehicles. So in the end is it actually safe for me to use it or should I get some other brand?

artbuc

That warning applies only to Karman Vortex MAF sensors. You have a hot wire sensor. I have used CRC MAF sensor cleaner many times on L and T hot wire sensors. Works great.

matts6887

Thanks art. I went ahead and bought a can of that stuff and Im gonna dig into it tomorrow when i have a day "off" between doings so to speak.

MrVarela

Thanx for your DIY hypervish.. good job .. and every body else's support ..

GaborL

So, just a foreword, I've done this "eliminate the carbon filter" mod to my 3 most recent cars and I gotta say, I love it. I do notice a little low end torque increase that of course comes with a little V8 rumble. My only concern is, on my current car (LS460L) I just removed these carbon filters and added K&N drop-in filters and a couple days later the car threw up a CEL, Check VSC, and traction light. Went to a local AAP, read the code which was a P010F which is along the lines of "mass air / value" something, I can't remember.
I reset the light just now by pulling the battery while I performed some cleaning of the throttle body and MAF sensors, but it was the second time these lights came back.
I know these cars are sensitive AF, I'm just wondering if anyone ever ran into these issues/codes...

salimshah

GaborL:

Are you sure this belongs in RX-300 first gen? LS460L & V8

Salim

siddfynch

Hi All,

I just checked the MAF on my "new" RX300 in hopes it would help solve the mystery of the "P0172 Bank 1 too rich" code. I found the seller did indeed replace the MAF, with a Duralast dL-3000 unit. Does anyone have experience with this product and could it be the source of a P0172 code after just ~200 miles? It is definitely brand new.

Also, I noticed the diode is green (not red), and I could not find the "lines" refers to in step 6 of the OP (copy below). Can someone explain these lines a little better?

Lexmus

If the MAF is only 200 miles old, it does not need cleaning.

Most folks on this board recommend replacing RX sensors with either OE or Denso aftermarket. Many people have had issues with other brand sensors.

About 1600 miles ago I replaced my MAF with a Denso for a P0171 code (and high fuel trims on both banks at above idle RPM) and all has been good since then.

Lexmus

With regard to P0172, you need to check your fuel trims to determine if the MAF is a likely cause of your code. If the trim is strongly negative on bank 1 and normal (close to zero) on bank 2, it is not the MAF. The MAF will affect the trims on both banks similarly. If it is only bank1 you have an issue with based on the trims, the A/F sensor is the likely culprit, with the fuel injectors next.

salimshah

As a general rule, only install OEM sensors. Not worth the aggravation.

Salim

siddfynch

Thanks guys. I re-installed the MAF (did not bother cleaning -it looked pristine) and removed the 20a EFI fuse for 2 mins. Will turn my attention to fuel trims next and then potentially the B1S1. Lots of good info on this site.

Drove the car ~ 20 miles after playing with the MAF. The CEL was gone. Presumably due to fuse removal?

murphysf

Hello

In step 6 why clean the tow lines, isn't the main sensor the part that needs the cleaning?

And what are those lines? Resistors? Diodes?

ursnicu

My 2004 ls 430 was idling bad at cold start, at 1200-1400 rpm, cleaned with electric contact spray, worked like a charm.
steps I use
1.disconect the negative terminal
2.unplug maf
3.remove maf
4.sprayed a lot on to the sensor, about 3 repeates times, each time after 5 min of drying
5.insert maf back
I left the battery unplugged for about 1 hour
6.plug maf
7.conect negative terminal of battery

now idling at 700 rpm


hope this helps