CEL is on because of malfunctioning O2 sensor

[98FWDSM]

O2 sensor heater circuit malfunction (bank 1 sensor 1) code #P0135 and #P0420 catalyst efficiency below threshold (bank 1)... this is why my check engine light keeps coming on just about every day. the P0420 code has been coming on ever since i had the cat beaten out. but the P0135 is a new one. is it possible that i have been running so rich that i melted the O2 sensor? or is it possible that i need to replace mine? also, i dont know if it is just me imagining it but i feel like i have a slight loss of power.

thanks

 

[98FWDSM]

bump

 

[AWDPetmitsu]

Chances are your O2 sensor (the one at the exhaust manifold) is malfuctioning. The only sure way to tell is to monitor its activity through a datalogger. How many miles do you have on the O2 sensor? What makes you say you are running rich? Prolonged rich mixtures will foul an O2 sensor.

 

[EclipseTrbo420A]

Just take out the second 02 sensor and rap it in tip foil. ziptie it somewhere inder your car and block off the hole for it. Thaty will work