silvr Posted July 12, 2008 Share Posted July 12, 2008 I recently had a smog done on a 1998 ES300. 15MPH RPM 1784 %CO2 9.2 HC MAX51 Measured 647!! CO(%) MAX .48 Measured 8.84! NO Max 419 Measured 45 25MPH HC MAX 35 Measured 679!!! CO MAX .46 Measured 9.04!! NO MAX 706 Measured 39 Any ideas on what is causing the problem? Bad oxygen sensor maybe? Quote Link to comment Share on other sites More sharing options...
homemechanic Posted July 12, 2008 Share Posted July 12, 2008 could be anything, but a bad oxygen sensor shouldn't give you 10x the limits. could be the muffler/exhaust system, internal engine oil leak, coolant getting into the engine or oxygen sensor? did the technician give you any hints? sometimes they try to fix it for you and make $$ and hope you pass the test again Quote Link to comment Share on other sites More sharing options...
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