Ford Mustang Forum - View Single Post - Check Engine Light ON
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post #1 of (permalink) Old 01-12-2006 Thread Starter
rtrejo77's Avatar
Joined: Mar 2005
Posts: 8
Angry Check Engine Light ON

The codes are P401 & P402 on the OBD reading and they say insufficient flow. I already changed the EGR valve. What else can I do? Please help if you can. Its a 96

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