Alexander- Posted June 11, 2017 Share Posted June 11, 2017 Hello, My car keeps getting a P0420 CEL. I have no idea what the culprit might be since both O2 sensors were changed not so long ago. What could be the probable cause? If this might be of any help. When I drive at low speeds and lower RPMs. When I barely hold the gas pedal, there seems to be some kind of surging happening (RPMs go up and down sporadically) I don't know if this is related but this is also a problem I haven't managed to fix yet. Thank you, Alexander Link to comment Share on other sites More sharing options...
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