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P0400 Diagnostic Trouble Code Discussion for December 2005

Exhaust Gas Recirculation System Flow Malfunction

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Trouble Ticket Help Requests for DTC P0400
Help Request Posted
1997 Geo Tracker 1.6L readiness monitors VIN: 2CNBJ1364V
P0400: EGR System Performance. ... 1.6 - came in with mil light on code P0135 - O2 heater circuit - and P0400 -EGR flow - We replaced rear O2 sensor, cleared codes and drove. The mil light stayed out and the O2 code is gone. The readiness monitors - catalyst,EGR,EVAP - did not close. We gav...
December 09, 2005