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Home >> Jeep >> 2017 >> Wrangler Sahara, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 105 (2.4L - DTCS B104D To P0335) >> DTC Troubleshooting >> P0121-Throttle Position Sensor 1 Performance >> Possible Causes

Possible Causes

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Possible Causes
EXCESSIVE RESISTANCE IN THE TPS 1 SIGNAL CIRCUIT
EXCESSIVE RESISTANCE IN THE 5-VOLT SUPPLY CIRCUIT
EXCESSIVE RESISTANCE IN THE TPS RETURN CIRCUIT
THROTTLE BODY
POWERTRAIN CONTROL MODULE (PCM)

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