Trouble code P20EE Catalyst Efficiency Below Threshold

Discussion in 'Volvo Forum' started by Midnightrider909, Nov 7, 2019.

  1. Midnightrider909

    Midnightrider909 Road Train Member

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    3150651A-3798-46DF-B3A4-BA0F6781969A.jpeg I had this problem 12,000 miles ago and it was addressed/fixed at the Volvo dealer in Cheyenne Wyoming. Just picked up a load in Southern California and the code went on again so now I’m headed to the phoenix Volvo dealer. I can’t understand why I would have the same issue just 12,000 miles later. Any ideas?
     
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  3. Newto Trucking

    Newto Trucking Medium Load Member

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    What year is your truck and a mileage??
     
  4. Midnightrider909

    Midnightrider909 Road Train Member

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    Oct 26, 2016
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    2018 780 with 192,000 miles. Team truck not idled much. D13 with Ishift.
     
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