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2006 Mitsubishi Galant Code P0421

Tiny
DIAZ764
  • MEMBER
  • 2006 MITSUBISHI GALANT
  • 97,000 MILES
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?
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Sunday, June 9th, 2013 AT 8:45 PM

9 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
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.
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Monday, June 10th, 2013 AT 7:20 AM
Tiny
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
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Monday, June 10th, 2013 AT 4:15 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Refer to diagram
Image (Click to make bigger)
Thumb
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Tuesday, June 11th, 2013 AT 11:46 AM
Tiny
DIAZ764
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  • 4 POSTS
Thanks so much great help. Just one last question, cylinders 1& 4 would be what bank? 1 or 2?
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Tuesday, June 11th, 2013 AT 3:12 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Bank 1. Sorry for missing that out.
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Tuesday, June 11th, 2013 AT 5:59 PM
Tiny
DIAZ764
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Thanks so much! Awesome help.
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Tuesday, June 11th, 2013 AT 10:08 PM
Tiny
KHLOW2008
  • MECHANIC
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You're welcome.

Have a nice day.
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Wednesday, June 12th, 2013 AT 8:12 AM
Tiny
06GALANTNY
  • MEMBER
  • 1 POST
I have the exact same car and error code. Bank 1 but would it be in the rear or front cat?

Thanks!
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Monday, February 17th, 2014 AT 5:30 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Bank 1 is the front.
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Thursday, February 27th, 2014 AT 11:35 AM

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