SOURCE: egr problem
Check the passages under the airhorn. When carbon builds up the diagnostic blames the EGR for not opening and throws a code. Actually there is no flow to the EGR because the port is clogged and the diagnostic measures the flow after the EGR.
They really needed to have a sensor before and after the EGR. Also remember to disconnect the battery for 10 minutes to remove old info.
SOURCE: where is the egr valve located on a 1997 mercury
follow the air filter vent up to the throttle body then look in back of aluminum housing
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