can someone explain this?
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Posting Guru
Joined: Mar 2009
Posts: 1,845
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From: Montague, NJ
can someone explain this?
well, if i run low octane fuel, i get a CEL P0420 (catalyst system efficiency below threshold) every 10+ miles. if i run high octane, then i get no code. when i was towing the 6klb trailer, i got the code. im almost sure my cats are clogged because when towing the trailer uphill, you could smell burning cat.
so why do i get it the code on regular and when towing but not when im just driving on premium?
so why do i get it the code on regular and when towing but not when im just driving on premium?
