2006 Mitsubishi Galant Code p0421

2006 MITSUBISHI GALANT
97,000 MILES
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DIAZ764
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Car has check engine light on .. I changed the cat on the bottom of the car but still has light on.. I understand that it can be a o2 sensor but how would I know what banks each sensor belongs to ? And on my engine I have 4 sensors positioned
1 passenger side 2 drivers side (top of engine)
3 passenger side 4 drivers side (bottom of engine)
What sensors have gone bad ?
Jun 9, 2013 at 8:45 PM
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KHLOW2008
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The code is for catalytic converter or O2 sensor of cylinder # 1 and # 4. It could be the wiring circuit that is at fault rather than the sensors.

Jun 10, 2013 at 7:20 AM
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DIAZ764
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Which sensors would those be...

1 passenger side. 2 drivers side
3 passenger side bottom of engine 4 driver side bottom of engine
Jun 10, 2013 at 4:15 PM
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KHLOW2008
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Refer to diagram
Jun 11, 2013 at 11:46 AM
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DIAZ764
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Thanks so much great help .. Just one last question, cylinders 1& 4 would be what bank ? 1 or 2?
Jun 11, 2013 at 3:12 PM
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KHLOW2008
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Bank 1. Sorry for missing that out.
Jun 11, 2013 at 5:59 PM
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DIAZ764
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Thanks so much! Awesome help .
Jun 11, 2013 at 10:08 PM
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KHLOW2008
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You're welcome.

Have a nice day.
Jun 12, 2013 at 8:12 AM
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06GALANTNY
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I have the exact same car and error code. Bank 1 but would it be in the rear or front cat?

Thanks!!
Feb 17, 2014 at 5:30 PM
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KHLOW2008
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Bank 1 is the front.
Feb 27, 2014 at 11:35 AM