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Codes P0050 and P0030 on my 2006 Cadillac CTS 3.6L

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I can switch bank 1 with bank 2 senor 1 and the trouble code will switch from p0030 to p0050 but when i put a brand new h02 sensor on either side with the code it still reads bad i have bought and tried 2 h02 sensors so far 1 came from dealer and one from advance auto it just seems like a new sensor wont register with the car

Vehicle: 2006 Cadillac CTS 3.6L

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