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P0411 over pressure?
Trying to get a handle on this as it fails first phase of test which tests for if system can produce enough pressure. I command it on and AIR pressure starts at 99kpa and climbs to 116/117kpa. Baro reports 100kpa. The AIR pressure sensor variance pid remains a... Login to read more. 
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| Engine | 4.6 L |
| Trans | 4-speed Automatic (Electronic) |
Vehicle Data
2009 Cadillac DTS 4.6L
| Engine | 4.6 L |
| Trans | 4-speed Automatic (Electronic) |
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