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Re: Toyota Camry Keeps giving code po420 every 6 days or so
Posted to Technical Discussion Forum on 9/5/2007 5 Replies

Hi Kirk,

I really don't understand how installing a more responsive post-cat O2 sensor is supposed to fix a P0420. I could see a sluggish pre-cat sensor being a possible cause but not a sluggish post-cat.

Care to explain? Login to read more.

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