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International Automotive Technicians Network
Re: Toyota Sienna PO420
Posted to Technical Discussion Forum on 9/8/2005

I've looked at the monitor set criterion and from what you've described the car in question seems normal. Is it possible that the engine temp. is not reaching 176 F. quickly enough because of a bad t-stat? or possibly an IAT sensor reading that's way off? thus... Login to read more.