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Old 05-06-2025, 03:34 PM   #1
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Join Date: Apr 2025
Location: Virgina, USA
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Error code P1128, endless hole of error codes

So recently I had my 2002 986 in the shop for an AOS replacement and I immediately got the P1128 error code. I have previously had issues with P0410 and P1411 before this and had my air filter replaced before that. There have been a few other unrelated (I think) times it has been in the shop for maintenance and it's starting to burn a hole through the wallet. I need the car to not have any error codes In order to pass inspection, and I don't feel like paying the labor fee for letting someone else do it anymore. any idea on where I should go from here?

Let me know if there is any other Info/pictures you might need to diagnose this.

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Old 05-07-2025, 02:03 AM   #2
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Since it showed up after AOS replacement it could be that you have a vacuum leak in one of the intake lines to the AOS. Those get brittle with age.
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Old 05-07-2025, 06:06 AM   #3
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P1128 - Fuel air mix so rich the system cannot adjust
-Incorrect MAF signal
-Fuel pressure too high
-Leaking injector
-EVAP cannister purge valve stuck open

P0410 SAI signal implausible
-Wiring harness issues
-SAI pump
-Changeover valve
-Air supply lines

P1411 SAI below limit

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Last edited by JFP in PA; 05-07-2025 at 06:11 AM.
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