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· Registered
3 Posts
Discussion Starter · #1 ·
My car has the Engine Lite On for the last couple of months. The power of the Car is a little less. Whenever I stop on a light or a stop Sign, i really have to push hard on the Gas to move.

These are the below Codes I get when I checked at Autozone

P0422 Main Catalyst below Threshold bank 1
P0304 Cylinder 4 Mis fire Detected

However whenever I use the top line Gas and reset the Code, the code does not come back. The code comes back whenever I use the middle or the Lowest level Gas

Can somebody recommend what I should be doing

· Premium Member
2015 Buick Verano "Leather Group", 2015 Kia Optima Hybrid
6,196 Posts
thats weird that it only comes on with regular gas. Id say replace the plug wires. see what effect happens. That should rid you of the misfire. betting a plug wire is on verge of its end. The other code has to do with an oxygen sensor i believe.

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