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Home >> Fiat >> 2017 >> 500 Lounge, Standard Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 37 (1.4L Turbo - DTCS P1043-00 To P2115-00 - 500) >> DTC Troubleshooting >> P1128-00 Closed Loop Fueling Not Achieved Bank 1 Upstream >> Possible Causes

Possible Causes

WARNING: This page is about a different variant/trim than selected.
Possible Causes
O2 SENSOR 1/1 WIRING OPEN OR SHORTED
RESTRICTED FUEL SUPPLY LINE
FUEL PUMP INLET STRAINER PLUGGED
FUEL FILTER/PRESSURE REGULATOR
FUEL PUMP MODULE
MAP SENSOR OPERATION
ECT SENSOR OPERATION
O2 SENSOR
FUEL FILTER/PRESSURE REGULATOR
POWERTRAIN CONTROL MODULE (PCM)

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. Refer to  PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE  .