It snaps in. But before you snap it out, take the nut out that holds the pipe to the exhaust manifold.
31manifold and/or airflow meter sensor signal circuit--airflow meter/circuit--manifold pressure sensor/circuit--ecu
on the side of the intake manifold. opposite side of the throttle body
Intake manifold tuning control circuit low (bank 1)
According to a source, it is a code that indicates a fault within the intake manifold runner control circuit.
Ignition/Distributor Engine Speed Input Circuit Malfunction
electronic spark timing is your distributor.
current may pass to the earth in case of short circuit without any harm.
Distribuator
You need to replace the manifold pressure sensor in most cases. The run from $20 to $100 and are fairly easy to replace.
1990 GEO PRIZM code 12 = RPM Signal Distributor, distributor circuit,starter signal circuit, igniter circuit igniter, ECM 1990 GEO PRIZM code 71 = EGR EGR system including hoses,gas temperature sensor circuit, gas temperature sensor, vacuum switching valve for the EGR circuit, ECM
intake manifold tune valve control circuit B1
Manifold ait temperature sensor circuit. Year and model?