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Message: [QUOTE="DieselDog, post: 1444088, member: 26353"] Catalyst is heated from fuel dosing during exhaust stroke. This is done by using left bank engine fuel injectors unless you've had the recent ford software update then it uses both cylinder heads rear 2 injectors on both banks to do the job now like the 6.4L strategy did. The Fuel will cause a reaction resulting in catalyst converter to heat to around 1500 degrees which then heats the exhaust filter performing exhaust regeneration. There is no separate injector dedicated just for exhaust cleaning. As for temperature drop could have a bad EGT sensor causing temperature drop readings. Do you know which sensor is droping temperature during cleaning ? Or as stated by 6.0 tech above you could attempt parameter reset see if that corrects concern. Sent from my SAMSUNG-SM-G930A using Tapatalk [/QUOTE]

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