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Re: nox and wierd egr problem
Posted to Emissions Forum on 10/21/2013

Switch time is good. I did notice the Coolant Temp sensor seems to be scewed. Shows 140F on scan tool most of the time. This may explain the weird turning of the EGR on and of at erratic times. Toyota info says EGR is shut off 140F and below. CTS circuit tests... Login to read more.