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Code 42
I have this truck in the bay it failed smog check because after extended idle the MIL would illuminate, comes up with a code 42, I went by the flow chart and it tells me to replace pcm, I have done that and still get the same condition. Kind of confused on wha... Login to read more. 
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| Engine | 5.7 L |
| Trans | 4-speed Automatic (Electronic) |
Vehicle Data
1995 Chevrolet Tahoe LS 5.7L
| Engine | 5.7 L |
| Trans | 4-speed Automatic (Electronic) |
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