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2016 Cadillac Escalade ESV Platinum 6.2L Excessive Emissions, Poor Idle Quality, MIL Lamp on
Posted to GM Driveability on 9/21/2026 7 Replies

**Repeat P0420 and persistent negative Bank 1 fuel trims after AFM delete** Greetings, This is a 2016 Cadillac Escalade with a 6.2L L86 engine and approximately 158,000 miles. The customer first brought it to us for a pre-purchase inspection. It ha...

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car Vehicle Data

2016 Cadillac Escalade ESV Platinum

VIN 1GYS4KKJ9G
Engine6.2 L / 8 cyl / FLEX
Trans8-speed Automatic (Electronic)
DeliveryFuel Injection / DI Returnless on demand
EmissionsOBD-II Compliant
SymptomsExcessive Emissions, Poor Idle Quality, MIL Lamp On
OccursAlways
Misc.New Cam/Lifters Afm Delete

Trouble Codes

P0420Catalyst Efficiency Below Threshold (Bank 1)
Open Help Request

car Vehicle Data

2016 Cadillac Escalade ESV Platinum

VIN 1GYS4KKJ9G
Engine6.2 L / 8 cyl / FLEX
Trans8-speed Automatic (Electronic)
DeliveryFuel Injection / DI Returnless on demand
EmissionsOBD-II Compliant
SymptomsExcessive Emissions, Poor Idle Quality, MIL Lamp On
OccursAlways
Misc.New Cam/Lifters Afm Delete

Trouble Codes

P0420Catalyst Efficiency Below Threshold (Bank 1)