Acura tl 99 displayed P0420 in the obd scanner and the dealer said to replace the catalytic convertor. The engine light was reset and hasn't lighted up for a month so far. I changed gas station. I put about 25 miles a day. If the catalytic convertor was the problem, shouldn't the engine light come up after 100 miles when the odb computer was in ready state? Original spark plugs with 150K. Should these be replaced? Anything else? Thank you in advance for any help.
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