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I HAVE A PROBLEM EMISSIONS!!!!! PO420. ADVISE PLEASE.....

cominatcha Jan 7, 2012

  1. cominatcha

    cominatcha gonna getcha

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    I HAVE A AUDI A4 AVANT 190 BEX 04 PLATE.............LAST YEAR HAD LIGHT ON PULLED THE CODE,PO420. TOLD TO REPLACE LAMBA REAR. DID THAT STILL ON AFTER 100 MILES. TOLD TO REPLACE CAT DID THAT AGAIN ON AFTER 100 MILES. TOLD TO CHANGE FRONT LAMBA DID THAT ON AGAIN AFTER 100 MILES. PUT IN FULL TANK OF SUPER DROVE 400 MILES ALL OK THEN LIGHT BACK ON. PUT LIGHT OUT PUT THROUGH MOT ALL OK. TWELVE MONTHS ON LIGHT HAS COME ON ABOUT THREE TIMES. OK PUT THE IN FOR A MOT GUESS WHAT FAILED ON HIGH EMISSIONS OF A CODE PULLED PO420..............I HAVE LOOKED FOR AIR AND VAC LEAKS AT THIS TIME NONE..................ANY ONE HAD THIS OR ANY ONE SHED ANY LIGHT ON THIS... THANKS NEIL
     
  2. Pabs

    Pabs Active Member

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  3. quattrojames

    quattrojames Moderator Staff Member Moderator Audi A6 Audi Avant Owner Group

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  4. cominatcha

    cominatcha gonna getcha

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    today i noticed black soot around the rear lamba sensor as mechanic left it held in by only two complete turns...... i have cleaned and fitted tight. would this give a poor emission? thanks for my replys neil
     
    Last edited: Jan 8, 2012

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