mirzah Posted December 20, 2010 Report Share Posted December 20, 2010 i have a 2004 Lexus ES 300 and it keeps popping a code of P0420 and the check engine light is on for like ever. i have almost replaced all the things and still the check engine light is on please help Link to comment Share on other sites More sharing options...
maliilex Posted December 21, 2010 Report Share Posted December 21, 2010 Spend fraction of cost in proper COMPUTER FKING Diagnose instead of spending on guess work. Link to comment Share on other sites More sharing options...
LS430'06 Posted January 20, 2011 Report Share Posted January 20, 2011 Check your exhaust sensors. Mostly the Es have that problems. Update us on the problem. Link to comment Share on other sites More sharing options...
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