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Q: Engine light is on. Went to Autozone & was told
code P0420 on 2000 Lincoln LS

This is catalyst efficiency low bank 1. This is the ability to store oxygen.Also states running condition.

Causes: i have been putting mid grade gas instead of premium would this be the reason.
Ps i changed the catalic convertor in 2011 due to the engine light
Thanks
greg
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NORMALLY THE AFTERMARKET CATTS COME WITH A 3 YR WARRANTY SO CK WITH INSTALLER. IF CAR HAS NO OTHER ISSUES CAUSING THIS FAILURE THEY MIGHT BE ABLE TO HELP
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