2003 Cadillac CTS Oxygen sensors

2003 CADILLAC CTS
75,000 MILES • 6 CYL • 2WD • AUTOMATIC
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LILJOE1219
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My check engine light came on in my vehicle and I took it to a shop and he told me that i needed to replace 3 oxygen sensors. What would cause 3 sensors to die simultaneously and how do i know which sensors to purchase to replace them because each site has about 15 different options and they say they will all work for my car. Any help would be greatly appreciated.
Apr 8, 2010 at 8:13 AM
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BLUELIGHTNIN6
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probably just one oxygen sensor failed, but your vehicle has 3 oxygen sensors in total and they should be replaced as regular maintenance anyway. so replacing all at once is best and as long as the part number matches up then the oxygen sensor will work.
Apr 22, 2010 at 10:11 PM