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I disagree. You should go over to the prius forums to read up on the technical analysis going on with the egr system.
Waiting for a code to be thrown is definitely not what you want to do with these vehicles.
The general consensus for this engine is to proactively clean the egr system around 100K-120K miles and not more than that under any circumstances.
I did it recently, the egr cooler was clogged 99 percent
Without warning light.
Occ can installed and pcv replaced.
Inlet manifold an throttle body cleaned.
The result are, better performance and fuel
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