I've got an 04 Deville, and it's not passing the emission test, not sure if the O2 senors needs replacing or what's cause it to fail the inspect. Has anyone ran into this issue?

I've got an 04 Deville, and it's not passing the emission test, not sure if the O2 senors needs replacing or what's cause it to fail the inspect. Has anyone ran into this issue?


you need to post the results of the test.


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