Buy a OBDII scan tool, it might be 02 sensors. but might not be a ton of different things can make the check engine light come on. Besides there are 4 O2 sensors in the car. 1 before the cat 1 after the cat in each pipe it might be O2 but would suck if you rerplace them and its not. besides you still need the scan tool to turn the light off. www.bavauto.com scan tool for 125.00
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