Engine-Codes - Ford - P1121 1999 FORD F150

P1121 1999 FORD F150 Code - Throttle Position Sensor Inconsistent with Mass Air Flow Sensor

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What is this?
Table of contents

|P1121 1999 FORD F150 code possible causes

  • Air leak between Mass Air Flow sensor and throttle body
  • Faulty Throttle Position Sensor
  • Throttle Position Sensor harness is open or shorted
  • Throttle Position Sensor circuit poor electrical connection
  • Damaged Mass Air Flow sensor

|How is the P1121 1999 FORD F150 code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|What is the cost to diagnose the P1121 1999 FORD F150 code

Labor: 1.0

The cost to diagnose the P1121 1999 FORD F150 code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|When is the P1121 1999 FORD F150 code detected?

Sensor signal output not consistent with engine load measurement

|What are P1121 1999 FORD F150 code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

|What is P1121 1999 FORD F150 code meaning?

The Powertrain Control Module (PCM) monitors a vehicle operation rationality check by comparing sensed throttle position to mass air flow readings. If during key ON engine running self-test the comparison of the TP sensor and MAF sensor readings are not consistent with calibrated load values, the test fails and a diagnostic trouble code is stored in continuous memory.

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