Help P0420 Code

Phillipsm

Member
Hello,

I have recently purchased a 99 Protege with 190Km. The Check engine light recently came on and we took it to the shop and they replaced the 2nd O2 sensor after the cat. About a week has passed and the light has come back on, and now we notice an ocassional loss of power when trying to accelerate. What can cause this?? Could it be the cat?? If so about how much does a cat cost to replace?

Thanks

Any help would help
 
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