trouble code P 0420
Mopar Lover
Joined: Apr 2009
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From: Michigan: The First Line of Defense From The Canadians!
Read this before you start throwing parts at it.
http://www.aa1car.com/library/p0420_dtc.htm
http://www.aa1car.com/library/p0420_dtc.htm
New Member
Joined: Mar 2011
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Code P0420 means "Catalyst System Efficency Below Threshold (Bank 1)"P0420 is actually Catalyst System Efficiency Below ThresholdCatalyst System Efficiency Below Threshold.
This means that the secondary O2 sensor detects that the catalytic converter isn't working as efficiently as it should.
This engine code can be triggered by any one of the following:
1.) The catalyst in the catalytic converter is cracked, clogged, or otherwise damaged.
2.) The secondary O2 sensor is malfunctioning.
3.) There is an exhaust leak.
4.) The computer unit is faulty.
This means that the secondary O2 sensor detects that the catalytic converter isn't working as efficiently as it should.
This engine code can be triggered by any one of the following:
1.) The catalyst in the catalytic converter is cracked, clogged, or otherwise damaged.
2.) The secondary O2 sensor is malfunctioning.
3.) There is an exhaust leak.
4.) The computer unit is faulty.
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