AutoCodes – Acura – P0121 Acura

P0121 Acura Code - Throttle Position Sensor 'A' Out of Range

Quick Answer

The electronic throttle control system controls the throttle valve opening. Common causes include Faulty Throttle Body, Throttle Body harness is open or shorted, Throttle Body circuit poor electrical connection. 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: P0121 Acura indicates Throttle Position Sensor 'A' Out of Range.
Common causes: Common causes include Faulty Throttle Body, Throttle Body harness is open or shorted, Throttle Body circuit poor electrical connection.
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.

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Code Popularity 381

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 02, 2023

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0121 Acura Description

The electronic throttle control system controls the throttle valve opening. The system includes the throttle actuator, the throttle valve, Throttle Position (TP) sensors 'A' and 'B', the Electronic Throttle Control System (ETCS) control relay, the Accelerator Pedal Position (APP) sensor, and the Powertrain Control Module (PCM). TP Sensor 'A' is a semiconductor type, and it is attached to the throttle body and shaft to determine the throttle valve position. The throttle valve position signal from TP Sensor 'A' is transmitted to the PCM for target position feedback control. If the signal from TP Sensor 'A' is a fixed value for a set time, the PCM detects a TP Sensor 'A' malfunction and stores a Diagnostic Trouble Code (DTC).

OBDII Code P0121 Acura - Throttle Position Sensor 'A' Out of Range - AutoCodes.com — P0121 Acura Code - Throttle Position Sensor 'A' Out of Range

What does this mean?

What are the Possible Causes of the DTC P0121 Acura?

Faulty Throttle Body
Throttle Body harness is open or shorted
Throttle Body circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P0121 Acura?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0121 Acura code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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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.

Frequently Asked Questions about P0121 Acura Code

1. What are the common symptoms of OBDII code P0121 in an Acura vehicle?

The common symptoms include rough idling, reduced engine power, stalling, poor acceleration, and the Check Engine light illuminating on the dashboard.

2. What does the OBDII code P0121 in an Acura indicate?

OBDII code P0121 signifies that the throttle position sensor 'A' is out of range, indicating a potential issue with the sensor's signal to the engine control module.

3. What are the possible causes of the throttle position sensor 'A' being out of range in an Acura?

Common causes include a faulty throttle position sensor, issues with the sensor wiring or connector, throttle body malfunctions, or problems with the engine control module.

4. How can I diagnose the throttle position sensor issue in my Acura when experiencing code P0121?

You can use a scan tool to read the OBDII code, visually inspect the sensor and its connections, perform a voltage test on the sensor, and check for any signs of wear or damage.

5. Is it safe to continue driving my Acura with OBDII code P0121 present?

It is not recommended to drive your vehicle with code P0121 as it can lead to poor engine performance, potential stalling, and further damage to engine components. It is best to address the issue promptly.

6. Can I repair the throttle position sensor issue causing code P0121 in my Acura myself?

If you have experience with automotive repairs and access to the necessary tools, you may be able to replace the throttle position sensor yourself. However, it is recommended to consult a professional mechanic for accurate diagnosis and repair.

7. Will resetting the Check Engine light make OBDII code P0121 disappear in my Acura?

Resetting the Check Engine light may temporarily turn off the warning indicator, but if the underlying issue causing code P0121 is not addressed, the light will likely reappear once the problem is detected again.

8. How much does it cost to repair OBDII code P0121 related to the throttle position sensor in an Acura?

The cost of repairing code P0121 can vary depending on the cause of the issue, the labor rates in your area, and whether you choose to replace the sensor yourself or have a professional mechanic handle the repair.

9. Are there any preventive measures to avoid OBDII code P0121 in my Acura?

Regular maintenance, such as cleaning the throttle body, inspecting sensor connections, and addressing any engine performance issues promptly, can help prevent the occurrence of code P0121 related to the throttle position sensor.

10. Can a faulty throttle position sensor causing code P0121 affect fuel efficiency in my Acura?

Yes, a faulty throttle position sensor can impact fuel efficiency by disrupting the air-fuel mixture ratio and engine performance, leading to decreased gas mileage. Addressing the issue promptly can help maintain optimal fuel economy.