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I have a 2006 Cayenne Turbo. Over the weekend, my check engine light came on. I ran the codes, P0338, P0346, P2a00, P2a03, P0021, P0335, P0606, P0344. I cleared the codes turned off the Ignition, then turned it back on and the starter would not turn, after taking the key out and reinserting itmultiple times, it finally engaged and started normally. I let it idle and almost immediately the check engine light came back on. The car is idling fine, I reved the engine and it reved smoothly no miss no hesitation nothing. I checked the codes again and this time they were P0338, & P0346. I again cleared the codes. Turned the ignition off, then back on and again the starter would not engage. I turned the ignition back off and back on and still nothing. I wiggled the key then the starter engaged and started right up. I decided to take it for a drive and see what happened. I ran down the highway no issue with acceleration, no missing no nothing. As I was returning home, I made a left hand turn and the message, "PSM Failure" came up and at this point the car would not accelerate. I pulled into a gas station and as soon as I stopped, the accelerator came back. I drove back home and checked the codes again, this time they were P0606, P0338, P0346, P2A00, P2A03, P2251, p1550, P1266, P0335. I'm thinking this is an issue with the ignition switch. What are your thoughts?

 

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