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Old 02-04-2009, 06:05 PM   #1
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Join Date: Feb 2009
Location: Daytona Beach
Posts: 350
Check Engine Light

Hey guys,

First timer here. I just bought my 2000 boxster s about a few months ago and I already got a check engine light (CEL). The guy I bought it from said this was normal since he hasn't replaced his O2 sensor for the one ahead of the catalytic converter for bank 1. He has this software where I hook it up to a laptop and it will allow me to reset the codes in the car. I saw that the 02 sensor was there but there was also a Idle Air Control System (IACS) error. It spits out a P0507 for it. I reset the codes and the CEL went away.

A few days later it was back on the dash. It was then that I decided to figure out what the error meant which I found to be either the throttle valve is sticking or an air intake leak. Yesterday, I removed the throttle valve with the sensor and cleaned off the inside. It didn't appear to be extremely dirty but there was some gunk so I got rid of it and put it back in the car. Upon doing this, the CEL was gone only to return again the next time I took it out.

I called up some dealerships and they were saying that the first thing they do is replace the throttle valve. It didn't seem to me like it was sticking and I cleaned it out pretty well so I'm not sure if thats my problem. Another dealership told me he thought it could be a mass air flow sensor or a bad air oil separator (AOS). He also explained how I could determine if my AOS is indeed working without having to get into the car engine.

He told me to remove the oil dipstick and to feel for suction. If there is a constant suction, then the AOS is bad. If there is suction and then air shooting out like in a cycle, then that is normal. So I heeded his advice and took out the dipstick and it did actually feel like a constant suction. If my AOS is bad, then that would definitely be why my CEL is on.

Does anyone know anything about that method or has tried it? What other way can I determine if I have a bad AOS for sure? Thanks in advance.

Last edited by Viper5; 02-04-2009 at 06:06 PM. Reason: forgot to write type of car
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