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Home >> Jeep >> 2019 >> Renegade High Altitude, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1297 (2.4L - DTCS P0645 To P1300) >> DTC Troubleshooting >> P1128-Closed Loop Fueling Not Achieved - Bank 1 Upstream >> Possible Causes

Possible Causes

WARNING: This page is about a different car, the 2020 Jeep Renegade. However, it is still accessible from the selected car via links, so may be relevant.
Possible Causes
FUEL DELIVERY SYSTEM
ECT SENSOR, WIRING, OR CONNECTORS
MAP SENSOR, WIRING, OR CONNECTORS
O2 SENSOR, WIRING, OR CONNECTORS
ENGINE MECHANICAL SYSTEM
POWERTRAIN CONTROL MODULE (PCM)

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