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Old 01-23-2010, 12:17 PM   #1
Taz
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Cool P1128 p1130

Hi I have a 2001 boxster recently I got a check engine light on and got the codes p1128 p1130.I changed the maf it was org.when changing it I was looking at my engine and found oil on the top of the engine.cleaned it up thought I had a oil fill leak but can't see it leaking.A week went by and the same codes came up.has anyone had this problem

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Old 01-23-2010, 10:01 PM   #2
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replace the aos... part is cheap and a few hours of diy.... same two codes i got when my aos went out...
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Old 01-24-2010, 08:17 AM   #3
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Thanks for the help.I have one other thing that noticed it sounds like a major air leak but I spray carb cleaner every where but nothing would the aos cause this sound our is this normal.
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Old 01-24-2010, 01:11 PM   #4
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Have you tried removing the oil fill cap with the motor idling?
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Old 01-24-2010, 01:27 PM   #5
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I'm able to remove the oil cap with no problem
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Old 01-24-2010, 01:32 PM   #6
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I can see a little oil burning of my exhaust on the pass side.that seems to be the only place I can see that oil is leaking .I had a 87 924s great ride
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Old 01-24-2010, 02:52 PM   #7
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Aos is on right side and if it's going out you can have an air leak. Has two hoses and a bellow on the bottom.. Also if it's failing will have oil there.
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Old 01-24-2010, 03:22 PM   #8
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I looked at the aos the top is dry the bottom is covered in oil.I'm going to bring it into the shop on Friday.any idea on what kind of price to expect
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Old 01-24-2010, 04:02 PM   #9
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1 800 346 0182 Sunset Porsche. Part and top tube to intake was just over $100 and install took 2 hrs with just a jack, jack stand, 1/4in 10mm deep socket w/ extension, small channel locks, and small needle nose vise grips. Labor should be 1.5 hrs but a shop will probably charge 2.

Air/Oil Seperator write up?

Only things I did different was popped the bottom ball sockets to lift the top (my top ball sockets have pita retaining wires), and just used needle nose vise grips to compress the clamp on the bellows and reused the factory clamp. Also it is hard to get the small channel locks to pop the hoses off, i used my fingers and a real careful screwdriver to pry. Oh, and I did more from underneath than Brad did.

I also had 1128 and 1130 I am chasing. It's been a couple of weeks but only 100 miles or so, fingers are crossed hoping the aos was it.

BTW, thanks again to Brad for the great write up, it was super helpful.
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Old 01-24-2010, 04:39 PM   #10
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Thanks for the info I'll post the results
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Old 01-25-2010, 06:41 AM   #11
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i just had my AOS replaced and am still getting the 1128 and 1130 codes (mainly on cold days or when I get stopped at red light/stop sign for prolonged periods of time)

I don't think it's the AOS causing this, but most likely a vacuum or exhaust leak
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Old 01-27-2011, 02:11 PM   #12
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P1128 = Oxygen Sensing Adaptation, Idle Range, Bank 1 - Above Limit
P1130 = Oxygen Sensing Adaptation, Idle Range, Bank 2 - Above Limit

These errors can have many causes including:
  • Fouled MAF sensor
  • Exhaust Leaks
  • Intake Leaks
  • Low Fuel Pressure
  • Fouled Fuel Injectors

Because you're gettig them on both banks at the same time, deductive reasoning suggests we can eleminate those that would be more likely to create an error in only one bank, leaving us with:
  • Fouled MAF sensor
  • Intake Leaks
  • Low Fuel Pressure

You replaced the MAF, and a bad AOS could create an intake leak, so your are on the right track. If that doesn't solve it, a fuel pressure test would be in order.
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Old 06-13-2013, 07:40 AM   #13
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2 weeks ago I got a check engine light that came on. Plugged my OBD-II reader and it gave 2 codes:

P1128 = Oxygen Sensing Adaptation, Idle Range, Bank 1 - Above Limit
P1130 = Oxygen Sensing Adaptation, Idle Range, Bank 2 - Above Limit

Before I spent good money on a new MAF, I opened up my engine, replaced the air filter and found my MAF sensor, got a can of MAF cleaner, sprayed it in and out, put it back, reset my codes.
Has not come on since... fingers crossed but looks, runs very well!



Last edited by soucorp; 06-13-2013 at 07:45 AM.
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