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In the 1998 Intrepid ES, 1684 indicates a problem with the catalytic converter. It probably is the same for the 2000.
Trouble code p0731 means: A/T Additional Gear Ratio Error In First Gear
HO2Sensor
Trouble code P0846 means:Transmission fluid pressure sensor/switch "B" circuit range/performance
Trouble code P0700 means: Automatic Transmission Control System Malfunction You need to check the TCM for codes
Trouble code P0700 means: Automatic Transmission Control System Malfunction You need to check the TCM for codes
Trouble code P0320 means:Ignition/distibutor engine speed input circuit malfunction
MAP sensor circuit low.MAP sensor circuit low.
Check Engine code of P0404 (EGR)
evap system
Faulty fuel injector.......had to replace 2 on my 2000 Intrepid...Good Luck
P0731 Gear I Incorrect ratio