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P1121 Acura Code - Throttle Position Lower Than Expected

Quick Answer

The P1121 code for Acura vehicles indicates that the throttle position is lower than what is expected by the Engine Control Module (ECM). Common causes include Faulty throttle position sensor (TPS), Wiring issues in the TPS circuit, Vacuum leak. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1121 Acura indicates Throttle Position Lower Than Expected.
Common causes
Common causes include Faulty throttle position sensor (TPS), Wiring issues in the TPS circuit, Vacuum leak.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P1121 Acura Description

The P1121 code for Acura vehicles indicates that the throttle position is lower than what is expected by the Engine Control Module (ECM). The throttle position sensor (TPS) is responsible for monitoring the position of the throttle valve and sending this information to the ECM, which uses it to adjust the air-fuel mixture for optimal engine performance. When the TPS reports a lower than expected throttle position, it can lead to various issues with the vehicle's performance.

OBDII Code P1121 Acura - Throttle Position Lower Than Expected
P1121 Acura Code - Throttle Position Lower Than Expected

Common Causes of P1121 Acura

  1. Faulty throttle position sensor (TPS)
  2. Wiring issues in the TPS circuit
  3. Vacuum leak
  4. Throttle body issues

Symptoms of P1121 Acura

  1. Rough idling
  2. Hesitation during acceleration
  3. Poor fuel efficiency
  4. Lack of power
  5. Check Engine Light illuminated

How to Fix P1121 Acura

  1. Begin by connecting a diagnostic scanner to the vehicle's OBD-II port to retrieve the specific trouble code.
  2. Inspect the throttle position sensor and its wiring for any signs of damage or wear. Replace the sensor if necessary.
  3. Check for vacuum leaks in the intake system and repair as needed.
  4. Clean the throttle body and perform a throttle body relearn procedure to ensure proper calibration.
  5. Clear the trouble code from the ECM's memory and test drive the vehicle to verify that the issue has been resolved.

Cost to Fix P1121 Acura

The cost of repairing a P1121 code on an Acura vehicle can vary depending on the specific cause of the issue. Typically, the cost of a new throttle position sensor ranges from $50 to $150, plus labor costs which can range from $100 to $200. Overall, the total repair cost for this issue could be anywhere from $150 to $350. However, it's important to note that labor rates at auto repair shops can vary, so it's recommended to check with local shops for more accurate pricing information.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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