P1128 check engine light code
 

Hi fellas, my car's been getting a check engine light on and off now for a P1128 bank 1 system too lean but only 1 code. Usually it would go with a P1130 but not this time. I took out the MAF and cleaned it with MAF cleaner spray, put it back, reset the computer and all was good for a month. Yesterday, it came back on, same P1128. I'm looking for a new MAF sensor but notice there seems to be 2 types for this 2001 986.

MAF with or without electronic throttle? How can I find out which type my car uses? Should I change the oxygen sensors too while I'm at it? How many O2 sensors are there in a 2001 2.7 engine (2 or 4)? I didn't see any air leaks when I was in there.

thanks,

Mike

Hi,

If you have a 2001 then you have the e-gas and not the wire throttle.

There are several revisions of the MAF for e-gas, and if you had a 2000 there would be a chance that you had the earlier one. For 2001, you have the most recent revision. This article from Pelican Parts 101 Projects for your Boxster has a breakdown and also a link to order the correct one.

Pelican Technical Article: Troubleshooting and Replacing the Boxster Mass Air Flow Sensor (MAF) - 986 / 987

If you determine that you need to replace your MAF, then this article will help you to figure out the correct one.

Steve

Thank you Steve, just the info I was looking for. My car just hit 36k miles, so I will get a new MAF sensor and see what happens. Maybe change the O2 sensors later as these are all fairly easy to do myself.

Best
-Mike

How can I tell which MAF sensor I have? I have a 2000 so it could be either...

Remove the mass air flow sensor. If it is original, the Porsche part number is printed on it.

Is there a DIY guide? I am not very mechanically inclined...

The link Steve provided in Post #2 also has instructions. Very easy to do but you do require the T-20 tamperproof bit