P0420 Buick - what reaction does this code causes?

Question

My 2001 Buick regal will eventually stop running if it stands in one place for a long period of time. It runs fine as long as it is moving and is not standing still for long. There are several codes stored in the computer. What could be causing this problem?

Answer 1

P0420 Catalsyt system efficiency below threshold (Bank 1)

P0442 Evaporative emission control system small leak detected

P1122 Throttle position sensor circuit intermittent low voltage

P1374 3X reference circuit

P0141 Heated 02 sensor circuit malfunction Bank 1 Sensor 2

For the vehicle to stall out after idling for quite some time the problem would be more likey the TPS sensor . It can hesistate the engine without setting a trouble code. As for P1374 this is more of a poor connection at the ignition control module, (ICM) usually when this code appear the engine does not even start. because it start this is more of a poor connection at the ICM