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?