I've not seen a thread about the different MAF sensors available for our cars and the internet sales arenas have many different ideas about what is the correct sensor for your x100. I've seen ebay listings for Subaru MAFs that "fit your car", 2003-2008 XKR MAFs, MAFs that "fit the XK8 and XKR", and much more. I would like to consolidate here a single thread that lists the appropriate part number for each X100 engine and also shed a little light on what is happening inside the MAF itself. I have been troubleshooting P0174, P0171, P0172 and P0175 trouble codes. After resolving all other possible culprits my MAF sensor was the culprit. The brand new, from a reputable online parts warehouse, shiny part was reading the incorrect values for my 4.2 SC XKR.

If you know beyond the shadow of a doubt the correct part number(s) for your engine, please post here and I will try and edit this first post with the correct information:

4.0 n/a:

4.0 SC:

4.2 n/a:

4.2 SC: My local dealer stated LNE1620 Denso is the correct part number. I found C2C7636 to be more correct.

For fun, I took one of the MAF sensors that didn't work and cut it open. When you spray that MAF cleaner in it, this is what you are trying to clean:



The big one on the left above is the IAT sensor and the two little wires are the MAF sensors. They are a very crude design in that they measure air flow by heating the wires up and measuring the voltage needed to maintain that temperature as the air flow tries to cool them. As you can imagine, if they are dirty, shrouded, corroded or otherwise non-sterile, they will not cool the same way and will thus read incorrect air flow measurements. In my opinion, these wires are robust enough to survive a cleaning with a Q-tip, however they are stacked on top of each other. If the bottom wire is soiled, you will not be able to manually clean it.

These three different MAFs all have the same LNE1620 part number, and only the third one below works for my 4.2 XKR:

Note this first one is the only one that has the "correct" part number written on it, and even says "S/C"



This last one (which works in my car) has a strange opening on top that the others do not. If anyone understands why it has this, I would like to know.


Please share your MAF knowledge here.

 

I’ve discovered that the correct MAF for the 4.0 supercharged application (XKR) is a rare and expensive part. It’s only used on the 4.0 XKR’s and 4.0 XJR’s.

Not used on Toyota’s or any other cars that I could discover. It’s over $200 from SN Barratt or the Jaguar dealerships. The MAF for the 4.0 XK8’s is more commonplace and a lot cheaper.

i found one Amazon seller that advertised a new MAF for the 4.0 XKR’s and even had a photo of it with the correct part number cast into the top. So I ordered one. When it came it turned out to be a generic MAF with the top completely blank, no stamping like their photo showed .

so I returned it. 100% False advertising

Unlike the 4.0 model, the MAF for the 4:2’s. Is the same for the XKR and the XK8 ( I’m going from memory here, so someone please correct me if I have it wrong).

Z

PS:
here is the factory original (correct) MAF on my 2002 4.0 XKR :

 

Also fighting the P0171/P0174 codes and decided to replace the MAF. Got the aftermarket one from SNG Barratt; worked for 2.5 weeks and then completely failed. Was able to replace it with the original one and able to drive, just have CEL on all the time and get Restricted Performance quite often.
The MAF is the same as ZRAY received from Amazon, completely blank on the top. SNG Barratt has told me that a replacement has been ordered from UK; has been 2.5 weeks and nothing has shown-up.
SNG Barratt part number is C2C7636*. Strongly suggest not getting this one.

 

For my wife's 2006 XK8, the correct MAF sensor is a genuine Denso 197-6030. I installed one in February 2017 and it has performed flawlessly. Back then I paid $68 for it. Expect them to be much more expensive now....

I remove it and clean it with CRC Mass Air Flow Sensor Cleaner Spray every time I do an oil & filter change....

 

Hey @Jon89, have a favor to ask of you. Could I send you the original MAF I removed from wife's 2006 XK8, have you install it in your wife's XK8 and then let me know what happens?
Here is some background:
Have had the lean codes P0171/P0174, plus occasional P1316 and multiple misfires. After replacing all the O rings on the breather lines and such I replaced the MAF with one from SNG Barratt. That stopped all the codes for about 2.5 weeks and then the engine stalled, would not re-start. I put the original MAF in, engine started, and the codes returned.
(Here is the interesting part)
I have been seeing the DSC Fault at startup for several years, have charged the battery several times which stops the fault at startup.
I put the battery charger on once again, removed when charger showed fully charged. Also cleared codes.
Started engine (with original MAF installed), started good, couple of misfires felt, but much less than it has had.
Took out for a drive just to see if the lean codes would return. Ended-up driving about 60 miles, with no CEL or Restricted Performance. Engine ran GREAT!
Looked-up when I had replaced the battery last......11 years ago!.....oh my!!
Purchased a new battery, put it on my charger as I always do with new batteries. Charged for about four hours, still not showing 100%, but installed it. Checked for codes, had lean both banks and multiple misfires.
Replaced MAF with a cheap one from RockAuto, cleared codes, went for a drive, only seven/eight miles. Stopped, engine off, no CEL, checked for codes, had none!

Just does not make sense that I had no CEL during that 60 mile drive with the old (charged) battery, but did set all of those pending codes.
Trying to decide if it was the old battery or the MAF or was it the combination?
I am not able to re-install the original MAF and see what happens as the XK8 is gone now. Wife had enough of it's issues.

So back to my original favor; could I send the orignal MAF to you to try out? Just want to know if it is defective or not.
Let me know.

Thanks,
LannyL81

 

Lanny,

I am not willing to install a potentially defective part in my wife's car that may throw OBDII codes and create issues that I will then have to deal with. These cars are finicky enough even with good parts. Sorry....

 

No problem.