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NEED HELP:SES light cyl5 code with O2 codes

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Hey guys, I am getting SES light lately. The car's idle also is a tad rougher. Not that it isn't smooth, but if paying attention its got a slight pulse every ten seconds maybe. Here are the codes I'm getting:

2E1C(IGNITION CYLINDER 5)
2C7C(After cat o2 Sensor signal, Bank 1)
2C7B(After cat o2 Sensor signal, Bank 2).

Car has 54,000 miles. New plugs put in last week, and cyl.5 coil was changed maybe 10k miles ago. Car is FBO w/DP of course.

Haven't done the walnut blast yet (dunno if that applies to issue)
Injectors wouldn't cause any of this right....?

To be honest I've had these codes pop up here and there for a few months, and would just clear the SES since the car feels good and light would maybe come on once a month or so.

Only problem is that now the SES light gets triggered everyday.

I remember changing the o2's related to the codes about three months ago but no dice.

Any help is appreciated thx.

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