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Code 420 and service engine soon light is on. That's how I
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Gmc: 6.5l diesel 2001 ...i came..security light..light stays..restart
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GM Tech (Cam)

GM Tech (Cam)

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Chris (aka- Moose)

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Paul M ASE Master

Paul M ASE Master

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Anthony

Anthony

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Amedee

Amedee

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