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E/Test Failure X2
I do not do E-Testing, thought that needs to be first. I have a customer that failed C0, Nox was O.K. I did a much needed tune-up. I am unable to scan this vehicle, tried 3 different scanners. It is the HD version, flatbed C3500. It failed worse now. C0 and NO... Login to read more. 
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30 Replies Received
| Engine | 7.4 L |
| Trans | 4-speed Automatic (Electronic) |
Vehicle Data
1991 GMC C3500 Sierra 7.4L
| Engine | 7.4 L |
| Trans | 4-speed Automatic (Electronic) |
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