The EGR system meters a little exhaust gas into the intake which lowers the combustion temperature which lessens the amount of NOx in the exhaust. The engine will run better without it but will produce more smog. Over a long period of time the higher combustion temperature can cause valve damage. indy4192 April 6, 2010, 9:00pm 7. The car will ONLY relearn if the learned values have been reset and this procedure must be done with the engine at idle and with zero throttle input. If during the relearn process there is any throttle input, you will get the 'Engine malfunction' message on the dash. Click to expand
Causes of EGR not Ready. Many issues can be responsible for code P0401 to display. But, the five common causes of a malfunctioning EGR monitor or valve are: Recent Battery replacement. ECU Memory resetting. Emissions control system problem. Software Updates. Component Replacement or Repair.
Low idle & vibration at idle. I have a 2010 Transit Connect with 89000 miles. The engine when fully warmed up will vibrate at idle in gear. The vibration will still be there in park but not nearly as bad. I have cleaned the throttle body, mass air flow sensor , fuel injectors and replaced one of the engine mounts. Common symptoms of this phenomenon include lumpy running when at idle, power loss and difficulty when faced with hills, as well as sometimes giving fluctuating readings of the temperature gauge. These issues can often by misdiagnosed as a blocked air intake, turbo fault or EGR valve malfunction, when in fact it’s a faulty thermostat.

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ford transit custom egr valve problems