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Here is the diagnostic chart for code P1188
SYMPTOM P1188 TIP SENSOR PERFORMANCETEST NOTE This symptom is diagnosed using the test P0234-OVERBOOST PERFORMANCE.WHEN MONITORED During the engine turbocharger boost and non-boost modesSET CONDITION Non-boost Mode: PCM detects a significant difference between TIP Sensor signal and BARO Pressure signal.Boost Mode: The TIP Sensor is unable to read correct boost level.POSSIBLE CAUSES