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Old 03-16-2009, 11:52 AM   #1
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Default Trouble code

I got the service engine code 0402 after I put in a new mass airflow sensor an reset it. I drove it today for a half an hour and the service engine light poped back on I pulled out my scanner and got that code.What does that code usually mean?
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Old 03-16-2009, 12:08 PM   #2
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See if this thread doesn't help you https://www.gmforum.com/t279443/
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Old 03-16-2009, 12:09 PM   #3
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DTC P0402 Exhaust Gas Recirculation Flow Excessive Detected
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Old 03-16-2009, 02:54 PM   #4
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EGR flow is detected by the MAP sensor. However if it'* stuck open ...which it should also complain about that.

Excessive flow might be a vacuum leak as well.
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Old 03-18-2009, 01:04 PM   #5
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i made a mistake the code was p0420
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