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04 Sonata Code P0421

 
 
 

Customer Question

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2004 sonata 4cyl keep geting po421 change oxygen senser before the cat , work for a week now its back.

Submitted: 867 days and 19 hours ago.
Category: Car
Status: CLOSED
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Optional Information

Year: 2004
Make: Hyundai
Make (other): sonata
Engine: 4cyl

Already Tried:
change oxygen senser change spark plugs and wiers

 
 
 
 
 
 

Accepted Answer

What you have going on here is that is the wrong 0/2 sensor/ The one that you need to look at is the one behind the cat. converter/ The down stream 0/2 sensor, Also keep in mind that that the converter may be bad and not the 0/2 sensor. I will send you some information.Thanks Let me know if you have any more issues!graphic

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Expert: Mastertech1
Pos. Feedback: 97.1 %
Accepts: 339

ASE Master Technician

30 years of all phases automotive diagnostics and repair

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Posted by Mastertech1 867 days and 19 hours ago.

Response From Expert

graphic

 
 
 
 
 
 

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