obdII code??? please help

[tony2fingers]

Just changed out the maf sensor (got a used one from 99 bosxter w/22k miles)and reset the CL light with my obdII scanner. it runs for about a day the CL goes back on. ObdII says :

Power train diagnostic:

MIL is ON Stored Trouble Codes Present
Misfire Monitoring Complete
Fuel Sys. Monitoring Complete
Component Monitoring Complete
Catalyst Monitoring Incomplete
Evaporative System Monitoring Complete
Sec. Air System Monitoring Complete
O2 Sensor Monitoring Incomplete
O2 Sensor Heater Monitoring Complete
Fuel Sys1-Closed Loop Mode
Fuel Sys2-Closed Loop Mode

Cmd Sec. Air Status ---- 4
# of O2 Sensors -------- 4

Trouble codes data:

ECU #=17
MIL is ON
Vehicle Reports 3 Stored Trouble Code(s)
TC1 -P1123
Trouble code definition not found
Pending Code 1 -PSSSS--Trouble code definition not found
Pending Code 2 -PSSSS--Trouble code definition not found
Pending Code 3 -PSSSS--Trouble code definition not found
A code of 0000 means no code


does any one know what the tc1-p1123 is?
Thanks in advance..

[MNBoxster]

Hi,

Hate to tell you, but you still have a MAF issue. This code - p1123 indicates that the ECU (DME in Porsche Parlance) has reached it's Lean Fuel Limit in response to a Rich A/F Mixture signal from the MAF but could not Lean it enough to achieve the proper mixture. You will most likely also get a second code - p1125 which indicates the same thing. The reason you didn't get it right away is that it had not completed one Drive Cycle. Once it did, and the condition persisted, it registered the fault and threw the CEL.

The MAF is a pretty sensitive instrument, it has to be. Personally, I would never go used, mileage in service means nothing. In this case, the used MAF isn't operating within Spec. Even if you don't throw a CEL, the DME can be running Fuel Maps which are less than ideal, but still within limits. This will cause less than optimal performance and MPG.

You could try cleaning it, a very delicate procedure, but I think you'd just be spinning your proverbial wheels. If you choose to try and salvage the used one, try the Mass Air Flow Sensor Cleaner from CRC Industries. Do not use any other type Solvents as they will permanently damage the MAF. The CRC Cleaner is about $6, see it at: www.crcindustries.com. If this doesn't work, stop wasting your time and replace with a new unit. Hope this helps...

Happy Motoring!... Jim'99

[tony2fingers]

jim, thanks for the input. Thats what i thought i was going to have to do, i allready tried to clean the maf once, not with maf cleaner but with a q tip and rubbing alcohol. Guess its pretty much to the dealer for me to get a new one huh.

[Tool Pants]

Where in California are you?