How Do I Repair Error Codes
Reply #11 –
That just tells you it opens properly.
Me too.
Code 34 is basically the computer saying "I told the EGR valve to close, but the sensor is telling me it's still open". Either the sensor's rod is sticking (not likely), or the EGR isn't closing all the way due to a build-up of carbon on the pintle/seat or the shaft.