OBD code p0327 and manifold gasket replacement

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Posted by Wait Griswold ( on 17:44:15 06/09/12

I took my 1999 454 K2500 Suburban to a local shop for some work and within two miles of leaving a check engine light came on. My code reader found two identical codes:
P0327; sensor 1 circuit low input (bank 1 or single sensor).

The following work was done:
replace intake manifold gasket
replace a front freeze plug
replace valve cover gaskets
reseal some leaks in transfer case
oil change and lube
replace oil cooler lines
replace heater bypass hose and thermostat

I don't know anything about the knock sensor system but found a TSB on the internet which leads me to believe a component is under the intake manifold.

Is it possible/likely that something happened during this repair to cause this code?

Thanks for your help.

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