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1998 Honda Accord "check engine light" on

Tiny
WHE
  • MEMBER
  • 1998 HONDA ACCORD
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 78,668 MILES
I just had this "check engine light" on in my car. The troubleshooting code is P0420 and the computer gives out a diagnosis of "Catalyst Efficiency low-Bank 1". But since my car only has run less than 80,000 miles so far, it is more like due to other problems than catalyst defficiency. What should I look at to determine the potential problem(s)?
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Thursday, May 29th, 2008 AT 9:37 AM

1 Reply

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Hi,

Basically it should either be the catalyst or the sensor that is not accurate. Wiring connections might be another cause and worse case scenario, the ECU is malfuntioning.
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Thursday, May 29th, 2008 AT 9:49 AM

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