2003 GMC Sonoma Q&A

2003 GMC Sonoma Question: po141

m.i.l. light is on. code scanned po141. Replaced o2 sens. cleared obc. came back on. same code. never ran the ethanol fuel in it. Could my cat.convert. be full o trash? I have to hit the key switch once, turn off, then turn it over to start. i put a fuel pump in it less than a year. engine idle surges @ start also. runs like a terd!?!? -
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the service eng. light comes on and stays.trouble code is po141 oxygen sensor ,bank 1 sensor 2.all oxygen sensors have been changed twice.