Non cat exhaust CEL? - Toyota Yaris Forums - Ultimate Yaris Enthusiast Site

01-26-2007, 11:38 AM

#11

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Break'em off some.

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Drives: 07 Yaris LB, 04 Cobra

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Quote:

Originally Posted by jouslee

Yea, looking at the diagram it seems like the front two are pre-cats, I'm not quite sure what they do in the yaris but on the 86-91 Rx-7's (They also had a 3 stage cat system) they would act like combustion chambers to burn the excess hydrocarbons that were thrown out by the engine.

The precats are for when the engine is cold.

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