Failed sensors can lead to premature failure of various components, especially catalytic converters: http://ricksfreeautorepairadvice.com/causes-catalytic-conve

Failed sensors can lead to premature failure of various components, especially catalytic converters: http://ricksfreeautorepairadvice.com/causes-catalytic-converter-go-bad/ http://ricksfreeautorepairadvice.com/causes-catalytic-conver... Don't put off a $150 job and cost yourself a $2k job. Most sensor replacements don't require removing the cylinder heads.