reseting the engine check light

[Where's my car?]

YEa i thought it was the Mass Airflow Sensor too!! but my mechanic insisted on the fact that i was o2 sensors. I ended up spending 600 fixing the first two o2 sensors, and the light is still on!!! do u think i should be the MAss Airflow Sensor??

[JAAY]

The whole job cost me 600 to do all 4 sensors and the mass air. I got the mass air from departstop.com and the sensor (buildable ones) from NAPA.

[steve00s]

I had codes P1128 and P1130. Replaced the mass air flow sensor and no more CEL. That was about a year ago.

[Bisimoto]

Where,
I have a PDT/PST at my facility, and can clear your codes. Feel free to visit the shop, since you live in the same city that I do. Let me know if you are interested.

[Where's my car?]

Yea! do u think u can recheck the light for me and see if there is any other problems. Cause i have changed the O2 sensors already THanks

[Where's my car?]

So here is the thing. I ended up spending another 250 dollars getting my car fully checked for the problem. The guy told me that of the two codes p1128 and p1130 there was a total of seven possible faults. He said after checking the faults which included the MAF, Oxygen Sensors, the Manifold, Oil Pressure ect.... He came to conclusion that my Custom Magnaflow Exhaust was causing some sort of back pressure that the car was not use to therefore causing the engine check light to turn on. CAn this really happen. I only swapped out the 3 inch in length piping after the 4 cats and the mufflers and the tips. NO change in between cats and headers. Can anyone give me some advice, or anything.

[Rodger]

Given the fact that numerous types of exhaust systems have been installed on Boxsters with no CELs, I'd say your mechanic is probably wrong.

The codes you pulled can be caused by a bad MAF or a simple vacuum leak. What did yuor mechanic do to rule out the MAF or a vacuum leak as the culprit? I would strongly suggest, before you spend any more money throwing parts at this thing, you put the top in the service position:

http://986forum.com/forums/showthread.php?t=11272

....and inspect the oil seperator connections, vacuum hoses, and the intake manifold plumbing. There's a bellows at the base of the oil seperator that often tears, causing codes similar to what you have.

The bellows:

If you don't find any defects, you should try replacing the MAF. Make sure you get the exact same part number you had before, otherwise you may require ECM reprogramming.

Lastly, you might take Bisi up on his offer.