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?