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Peter (not verified)    October 20, 2023 - 1:02AM

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Almost too good to be true but got me through smog!!!!!

2005 Prius Gen. 2. 225k miles.

If you try this a few things seem to affect it.

A good run on the freeway really working the engine made the 420 code go away for a while.

Cool engine brought the code back.

I had to time my trip to the smog station just right.

Totally worth it in California where a new cat costs more than the car cost me!!!

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