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Hi, I have a 2017 Ford E350 RV with a v10 Engine.
It is showing a P0420 code. I also noticed a loss of vacuum when accelerating up a hill ‘ AC Vent closes then opens again when back to cruising speed.
A repair shop replaced the o2 sensors – no fix the code returned, Another shop replaced the plugs and coils as the truck has reached 90,000 miles – no fix code returns. What do you think I should do? As a RV most Ford dealers in my area will not work on RV’s even tho it is a Ford cab & chassis with a box on the back.
Regards
Bud in the Florida Keys
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