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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 >> P0171 Fuel System 1/1 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
HIGH ETHANOL CONTENT (NON E85 VEHICLE)
ENGINE MECHANICAL - VACUUM LEAK
LEAK IN THE PURGE FLOW SYSTEM
EXHAUST SYSTEM LEAK
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  .