My GF’s Father has a 2001 Nissan Sentra 1.8L with real low miles and Service Engine Soon light came on and after a bit started flashing while vehicle was staggering at idle, low speeds and running rough at speed. Scanner at Auto Zone threw a code stating Cylinder 2 Misfire. With that we flipped the Ignition Coil from cylinder 2 to 1 and vehicle threw a Random Misfire Code which told us the Ignition Coil was bad. New Coil car starts and runs fine engine miss is gone so we cleared the code. Next Day, Service Engine Soon Light goes on but no significant performance issues. Scanner throws a P0430 Code “Catalyst Below Threshold; Bank 2” Guy tells me O2 Sensor Downstream from the Cat is bad. Or Catalytic Convertor is bad. I do not believe the Cat is Bad because at highway speed if you stab it it hits passing gear and accelerates steadily with zero hesitation, I am thinking Evaporators System Leak somewhere. Question: Am I on the right track? And would a Starter Fluid Test be appropriate before swapping O2’s and Cats? Additional information, car has 27,000 original miles on it and was previously owned from a 92 year old lady who couldn’t drive it much the last year and it sat quite a bit un-started, undriven. The day after we replaced the Ignition Coil I ran some Fuel Injector Cleaner by adding it to the tank and filling it up. I am thinking long term sitting without running engine winters/summer on east coast may have weekend vacuum lines, Air Filter Housing and the like and will perform in depth visual inspection prior to any of your recommendations. Please Help!
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