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Originally Posted by Dale_K
Thanks. As it turns out, I am also fighting the 1126, 1128 and 1130 codes and have cleaned my MAF sensor twice with genuine MAF sensor cleaner. I want to suggest to you that maybe the sensor is good and you might have a vacuum leak. I found one on my oil fill tube and I was sure that was going to fix my car but the codes came back after 300 miles. I took my car to a shop that had a smoke machine to slightly pressurize the intake system with smoke and they found another leak on the vacuum line to the brake booster where it leaves the engine compartment behind the driver. I just ordered the replacement parts a few minutes ago.
My plan is to fix the vacuum leaks first and use the Durametric to monitor the long term fuel trim and MAF sensor readings. Also the "running lean" codes since I'll be able to see them even if the CEL isn't lit. I ordered a cap for the fuel rail pressure test point since the manual says you can't reuse the old cap and if the CEL comes on again after the current round of leaks are fixed I'll test the fuel pressure because that would cause the codes if the pressure is low.
Then if the CEL still comes on I'll buy a MAF sensor but at least I'll have some baseline readings from the Durametric to see if the new sensor has higher airflow readings than the old one.
Let me know how your repair turns out.
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Cleaned my MAF last Saturday (never been cleaned before, I have 209,000 miles on the car... It was dirty) but my 1128 and 1130 alarm codes came back today... Darn it. Now I'm going to take your recommendation and look for a vacuum leak.
(A couple hours later... I edited this post) At another web site I read some information about the AOS. So I started my Boxster and with much effort removed the oil fill cap.... Whooooosh, it sounded like my shop vac and my 986 almost died. I put my hand over the oil fill hole and I thought I was going to get sucked-into the engine compartment!! I don't know what normal preasure is but I think I have an AOS problem.
Jager