has anybody had this code? it's on a 2000 nissan Sentra it says catalyst system efficiency below thresh hold(bank1) what does this mean? thanks Randy
code Po420 Nissan Sentra?
Aug 25, 2005
2 Replies
Shep is correct. From my OBD-II manual:
P0420 Catalyst System Efficiency Below Threshold (Bank 1)
It is PROBABLY a bad catalytic converter. A cheap fix from an exhaust shop, if you use a universal replacement.
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