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Exhaust Manifold leak vs P0402 code HELP

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Old 01-02-2011, 09:36 PM   #1
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Exhaust Manifold leak vs P0402 code HELP

Can anyone tell me if a cracked exhaust manifold can trigger the P0402 code? the P0402 code is this.....
P0402 - system fault exhaust gas recirculation - too much flow on EGR
1) EGR valve stuck open
2) failed EGR pressure sensor, or valve or pressure sensor

.....or should i check the EGR valve and lines? if i need to check the valve or lines, what is the best do that? i know where they are located and ran seafoam through the motor. I am not positive the manifold is cracked but i can hear a "puffing" noise when driving and can not find a leak anywhere else so im assuming its a manifold leak but i do not smell any fumes or have other symptoms besides the "puffing". the manifold is covered by a heat shield and i cant remove the nuts of the shield because they are rusted on there pretty good. Or am i looking at two different problems?

thanks
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Old 02-09-2011, 08:42 PM   #2
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does your engine run rough at idle? if no then your egr is not stuck open... check the egr modulator
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Old 02-10-2011, 10:10 AM   #3
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no, my truck runs really well, i would never know anything is wrong if it wasnt for the CEL. where is the modulator?
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Old 02-10-2011, 08:09 PM   #4
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its this little plastic circular thing right next to or close to the egr valve
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