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Home >> Jeep >> 2023 >> Grand Cherokee Altitude, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 61 (5.7L - DTCS P0133 To P0175) >> DTC Troubleshooting >> P0174 Fuel System 2/1 Lean >> Possible Causes

Possible Causes

WARNING: This page is about a different variant/trim than selected.
Possible Causes
LOW FUEL PRESSURE OR VOLUME/RESTRICTED FUEL INJECTOR
ENGINE MECHANICAL - VACUUM LEAK
EXHAUST SYSTEM LEAK
LEAK IN THE PURGE FLOW SYSTEM
HIGH ETHANOL CONTENT (NON E85 VEHICLE)
FAULTY MAP SENSOR READING
O2 SENSOR WIRING ISSUE
OXYGEN (O2) SENSOR
POWERTRAIN CONTROL MODULE (PCM)

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