Replaced MAF, Check engine light ON
 

Replaced the Mass Air Flow sensor and air filter on my 2000 986 Boxster S. Check engine light was out for two days. It is back on?? What next? Code scanner had bad MAF sensor code listed.

What code?

Dont remember code #
 

It said MAF. I will have to read again to see what was the code # was. I will read again and write down code.

Just reread codes. Now it is not saying MAF. Now reads codes P1128 and P1130 which say OXY sensing?

Those are common codes.

Use the search function on this forum to see what others have discovered after following the diagnostic flow chart included in the repair manuals. Mostly not the MAF itself but something affecting the fuel air mix like a leak.

be absolutely sure that you replaced the MAF with the proper part number. In the 2000 cars, many of the dme or replaced which required a different MAF. What I would do is make sure that the replacement MAF is exactly the same part number as the MAF that you removed.

Those two codes could mean vacuum leaks since they are reporting both banks. Lean conditions. Highly unlikely that 2 O2 sensors could go out. I would reinvestigate the Maf, maybe clean and be absolute its fastened well.

Replaced MAF with Bosch OEM part
 

I ordered Bosche OEM MAF from Amazon part #OPEL 1882019, PORSCHE 98660612500, PORSCHE 98660612501. I also installed a new BMC air filter.
I checked around and I am pretty sure this is the latest replacement part(latest version)
My first time attempt to get to the engine compartment was difficulty....had a hard time with removing the ball socketed cables. I had ordered a set of tamper proof torx bit sockets. The set had two T8s and the T20 was missing. I had to quit and go around and find a T20. Very frustrating.

I have watched several videos on replacing the oxygen sensors. The car is 18 years old and the code says oxygen sensors. How long do oxygen sensors last?

I had one code p1128 which turned out to be just one bank replaced @69K. I did replace both at the time. Still think if you are having both P1128/1130 that it may not be O2 sensor. Check after Maf for unmetered air. Those rubber couplers for resonance tube and Throttle body T.
Is the Maf sensor new? Used ones can be a crapshoot.

If the MAF that you replaced is the updated version of the MAF that you pulled out (different part number than the original MAF) then my understanding is that you have to have the dme updated with the Porsche diagnostic tool.

Why did you have a tough time with the ball sockets? All they do is hold down the water barrier. Remove only the end at the top. They pop of very easily. You didn’t try to remove the red ones did you!? They are the ones connected to the actuator for the top itself. No need to remove if you did.

1st time cable ball removal
 

The cables are short so you can't raise the water barrier high enough to see them. I had never seen the little pin that holds the ball in the socket. Finally realized that you unclick pin from bottom of ball, rotate and remove pin. Ball was kinda hard to remove from socket after I removed pin. I had to put the pins back in by feel but I got them in.
The next time it will be a lot easier.....newbe problems 1st time.

update DME
 

The MAF I installed was the latest updated version. Who can update the DME? Dealer or Porsche shop??

High milage
 

My Boxster has 163,400 miles on it.....still runs like a beast.:) Do Oxy Sensors last that long?

I am not so sure, specially now that you may have jinxed yourself ..LOL

Either a Porsche dealer or an Indie (or private party) that has the Porsche diagnostic tool.

For a discussion of the MAF version-dme update issue see:
https://www.pelicanparts.com/techarticles/Boxster_Tech/27-FUEL-Mass_Air_Flow_Sensor/27-FUEL-Mass_Air_Flow_Sensor.htm