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P1120 Mazda Code - Throttle Position Sensor Out Of Range

Quick Answer

The P1120 diagnostic trouble code in Mazda vehicles indicates that the Throttle Position Sensor (TPS) is reading a voltage that is outside of the normal operating range. Common causes include Dirty or worn Throttle Position Sensor, Faulty wiring or connectors, Electrical interference. 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
P1120 Mazda indicates Throttle Position Sensor Out Of Range.
Common causes
Common causes include Dirty or worn Throttle Position Sensor, Faulty wiring or connectors, Electrical interference.
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 P1120 Mazda Description

The P1120 diagnostic trouble code in Mazda vehicles indicates that the Throttle Position Sensor (TPS) is reading a voltage that is outside of the normal operating range. The TPS is a crucial component of the engine management system, as it informs the engine control unit (ECU) about the position of the throttle valve. This information is used to determine the amount of air entering the engine, which in turn affects fuel delivery and ignition timing.

OBDII Code P1120 Mazda - Throttle Position Sensor Out Of Range
P1120 Mazda Code - Throttle Position Sensor Out Of Range

Common Causes of P1120 Mazda

  1. Dirty or worn Throttle Position Sensor
  2. Faulty wiring or connectors
  3. Electrical interference
  4. TPS misalignment
  5. ECU software issues

Symptoms of P1120 Mazda

  1. Rough idling or stalling
  2. Hesitation or lack of response when accelerating
  3. Decreased fuel efficiency
  4. Check Engine Light illuminated
  5. Engine going into limp mode

How to Fix P1120 Mazda

  1. Start by diagnosing the issue with a scan tool to confirm the P1120 code and verify the TPS readings.
  2. Inspect the TPS for any signs of dirt, wear, or misalignment. Clean or adjust as necessary.
  3. Check the wiring and connectors for any damage or corrosion. Repair or replace as needed.
  4. If the TPS is faulty, replace it with a new one following manufacturer's guidelines.
  5. Clear the code from the ECU memory and perform a test drive to ensure the issue is resolved.

Cost to Fix P1120 Mazda

The typical repair costs for addressing a P1120 code in a Mazda vehicle can vary depending on the specific model and year. In general, replacing a Throttle Position Sensor can range from $100 to $200, including parts and labor. Additional costs may apply if wiring repairs or other components need to be addressed. It's important to note that diagnostic time and labor rates can vary between auto repair shops, so it's advisable to check with local providers for a more accurate estimate.

When is the Code Detected?

Malfunction is detected when voltage from the sensor is sent to Engine Control Module (ECM) is out of range.

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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 P1120 Mazda Code

1. What does the OBDII code P1120 mean on a Mazda?

P1120 indicates that the Throttle Position Sensor (TPS) is detecting values that are out of the expected range, which may signal a malfunction in the sensor or its circuit.

2. What are the common symptoms of a P1120 code on a Mazda?

Symptoms may include poor acceleration, hesitation, reduced engine performance, erratic idling, or the Check Engine Light turning on.

3. What causes the P1120 code to appear in a Mazda?

The most common causes are a faulty Throttle Position Sensor, damaged wiring or connectors, or issues with the throttle body assembly.

4. Can a dirty throttle body cause a P1120 code?

Yes, a dirty or stuck throttle body can cause the TPS to send incorrect signals, resulting in the P1120 code.

5. How do I diagnose the P1120 code on my Mazda?

Start by inspecting the TPS and its wiring for damage, test the sensor's voltage output with a multimeter, and ensure the throttle body is clean and functioning properly.

6. Can I drive my Mazda with a P1120 code?

Driving with a P1120 code is not recommended as it can cause poor engine performance and potentially damage other components over time.

7. How do I fix the P1120 code on my Mazda?

Repairs may include cleaning the throttle body, replacing the Throttle Position Sensor, repairing damaged wiring, or recalibrating the TPS.

8. Does the P1120 code require reprogramming the ECU?

In most cases, ECU reprogramming is not required, but the TPS may need to be recalibrated after replacement.

9. What tools do I need to fix a P1120 code?

You’ll typically need a multimeter, OBDII scanner, and basic tools for removing and inspecting the TPS or throttle body.

10. How much does it cost to repair a P1120 code on a Mazda?

The cost varies depending on the issue. Replacing the TPS typically costs $100-$300, while cleaning the throttle body or repairing wiring may be less expensive.

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