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Old 01-24-2015, 12:30 AM   #1 (permalink)
Striker2237
EcoModding Apprentice
 
Join Date: Dec 2014
Location: Ohio
Posts: 174

Silver Magnum - '03 Dodge Ram 1500 Laramie
90 day: 11.43 mpg (US)
Thanks: 11
Thanked 11 Times in 10 Posts
Does a CEL being active matter for mpg?

So back track three months and I had a full exhaust system installed (long tube headers, custom fabricated mid pipe, dual pipes side flared) with a mid pipe that was hand build to fit my truck that included 3 high flow cats (one main, two pre-cats). Anyway once winter hit with colder air my engine has been intermittently throwing the P 0420 CEL code from time to time. Does this effect open/closed loop operation? Hurt MPG?

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