this car is driving me nutz... its an 06 g6 with the 2.4 auto... i am now on my 2nd o2 sensor and again the check engine light (the dash light with the photo of the engine) is on again. the last o2 sensor i put in was the one after the cat and its part number is 15543 (bosch brand) the prob in the exhaust pipe is smaller than the stock one... now i am thinking its not the correct one. any one got this problem or have the right part number for the first and second o2 sensor? and who had this problem but now its fixed?
