answersLogoWhite

0


Best Answer

When I had that problem on my 1997 Buick lesabre, I had to replace the catalyst converter and the 02 sensor on it. It resolved the issue with the code.

User Avatar

Wiki User

14y ago
This answer is:
User Avatar

Add your answer:

Earn +20 pts
Q: How do you fix a p0420catalysteffiencybelow thrsehholdbank1?
Write your answer...
Submit
Still have questions?
magnify glass
imp