Re: P0420 Set In Open Loop

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Posted to Technical Discussion Forum on 2/21/2016

As John pointed out, the ECM can command OL during the test. Here is an example from a 06 G6 with the 2.4:

[2006 Pontiac G6, Emissions Scan Data]

You can see engine is going back into OL while the monitor is running. Login to read more.

Files Referenced:

Vehicle Data

2006 Pontiac G6 2.4L

Engine	2.4 L
Trans	4-speed Automatic (Electronic)

Vehicle Data

2006 Pontiac G6 2.4L

Engine	2.4 L
Trans	4-speed Automatic (Electronic)