code 155 came up diagnostic

2000 CADILLAC DEVILLE DTS
150,000 MILES
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KENTHILL
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changed sensor check engine light still coming on changed spark plugs car runs good what could be the problem
Feb 3, 2012 at 10:52 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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