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mass air flow sensor

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Stock mass airflow sensor went bad,i asked my porsche only repair shop to install the up grade sensor.This is for a 2000 s.The up grade sensor requires a flash.When the sensor was installed and flashed, the car ran unbelieveable,I drove the car about 70 and stopped for gas {sunoco ultra} I drove the car another 30 miles and it started running like junk.When I got home I called the owner of the shop,I asked him about the gas,thinking there was water in it.After my conversation with him I disconnected the wiring to the sensor leaving the sensor in.We replaced the sensor again with the same upgraded part,numbers on the bosch box matched.Same thing happend,ran great then junk by the time I reached home.After the owner and I did alot of research,we both recieved the same info.According to bosch the part numbers for the stock part and the upgrade part are one in the same??????? Bosch also told us that 99% of the parts companies out there dont know about this and they think they are selling the upgrade part according to their reference sheets from bosch,bosch also told us both that there is a upgrade part and the numbers are 1 number different and this part is only avaliable from a porsche dealership only and no where else.Does any one out there know of a way around this, besides paying 500 and change and the dealerships hourly rate.It seems to me that bosch and porsche are trying to keep the part in house and in house installation.Again help is there any one out there that knows of another company that sells a upgrade sensor and can someone also explain to me why bosch would sell wholesale/retail parts dealers a false part.I consider my self a smart person like most of the people on this site and still dont or should I say want to understand why bosch would do such a thing to their parts distributors and customers.Also if i would to by a flash kit from evo or softronics will there be a problem or any other performance parts,plenum,throttle body,cold air box exaust system etc

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Make sure it is the right part - it should be a Porsche 986 606 125 00 or equal.

When they programmed the car did they choose the correct program (Boxster S OBD II (LEV, manual transmission)?

After programming they should also do an throttle adaption - (turn ignition on for 1 minute do not touch the accelerator pedal - turn off then start normally).

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  • 2 weeks later...

I'll assume you had a -124 in the car originally. You should be able to tell from the VIN number or by looking at the old part. Then you thought they put in a -125-0 or -125-1. The ECU programs itself after a short period of running time and begins then using the learned paramaters rather than a set of baseline paramaters. If the MAF is then giving it different values from the ones it expects because the MAF is not the type it is expecting, the ECU can get all confused. Which explains the first 50-70 miles good as it is running on a basic program, not trying to use the learned paramaters because it is still learning. Once it thinks it has learned, chaos.

As Loren inplied above, a ECU flash mismatch with the MAF is a suspect.

http://sites.google.com/site/mikefocke2/checkenginelightcausedbymassairflowsensor has a table of the Bosch part numbers and the Porsche part numbers which should allow you to remove the MAF you have now and see what you have. Once you know that, then you can determine the revision of the ECU flash you will need to have.

If you find out anything different than is in the table at the end of the web page cited above, please send me a PM and let me know.

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