P1121 MINI Possible Causes

• Faulty pedal position sensor
• Pedal position sensor wiring harness is open or short-circuited
• Poor electrical connection in the pedal position sensor circuit

How to Fix P1121 MINI Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Engine light on (or engine service warning light soon)

P1121 MINI Meaning

Throttle Pedal Position Sensor 1 Range/Performance Problem is the generic description for the P1121 Mini code, but the manufacturer may have a different description for your specific vehicle model and year. Currently, we don’t have additional information about the P1121 Mini OBDII code.

P1121 NISSAN Possible Causes

• Faulty electronic throttle control actuator
• Electronic throttle control actuator harness is open or shorted
• Poor electrical connection in electronic throttle control actuator circuit

How to Fix P1121 NISSAN Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding cable harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

When is the Code Detected?

The electronic throttle control actuator is not functioning properly due to a malfunction of the return spring or the throttle valve is stuck open

Possible Symptoms

Engine light on (or service engine soon warning light)
No response from accelerator pedal

P1121 NISSAN Meaning

The electronic throttle control actuator consists of a throttle control motor, throttle position sensor (TPS), etc. The throttle control motor is operated by the engine control module (ECM) and it opens and closes the throttle valve.

The throttle position sensor detects the throttle valve position and the opening/closing speed of the throttle valve and transmits voltage signals to the ECM. The ECM evaluates the current throttle opening angle from these signals and the ECM controls the throttle control motor to properly adjust the throttle opening angle in response to driving conditions.

P1121 PONTIAC Possible Causes

• Faulty throttle position sensor
• Throttle position sensor harness is open or shorted
• Poor electrical connection in throttle position sensor circuit
• Throttle position sensor improperly adjusted

How to Fix P1121 PONTIAC Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

When is the Code Detected?

When the Powertrain Control Module (PCM) detects a signal voltage outside the normal operating range of the sensor, P1121 is set.

Symptoms

Possible

Illuminated engine light (or service engine soon warning light)

P1121 PONTIAC Meaning

The Throttle Position (TP) sensor is a potentiometer. The TP sensor provides a voltage signal that changes relative to the throttle blade angle. This signal voltage is one of the most important inputs used by the Powertrain Control Module (PCM). The TP sensor has a 5.0 volt reference, ground, and signal circuit.

TP sensor signal voltage should be approximately 0.6 volt at idle. The TP sensor voltage should increase to over 4.0 volts at wide open throttle (WOT).

P1121 SATURN Possible Causes

• Faulty throttle position sensor
• Throttle position sensor harness is open or shorted
• Poor electrical connection in throttle position sensor circuit
• Improperly adjusted throttle position sensor

How to Fix P1121 SATURN Code?

Begin 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 pins.

When is the Code Detected?

When the Powertrain Control Module (PCM) detects a signal voltage outside the normal operating range of the sensor, P1121 is set.

Possible Symptoms

Illuminated check engine light (or service engine soon warning light)

P1121 SATURN Meaning

The Throttle Position (TP) sensor is a potentiometer. The TP sensor provides a voltage signal that changes relative to throttle blade angle. This signal voltage is one of the most important inputs used by the Powertrain Control Module (PCM). The TP sensor has a 5.0 volt reference, ground, and signal circuit.
TP sensor signal voltage should be approximately 0.6 volt at idle. TP sensor voltage should increase to over 4.0 volts at wide open throttle (WOT).

P1121 SUBARU Possible Causes

• Faulty neutral position switch
• Neutral position switch harness is open or shorted
• Poor electrical connection in neutral position switch circuit

How to Fix P1121 SUBARU Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Check engine light on (or service engine soon warning light)

P1121 SUBARU Meaning

Neutral position switch circuit low input [MT Vehicles]
Neutral position switch circuit low input [AT Vehicles]

P1121 SUZUKI Possible Causes

• Faulty throttle position sensor
• Throttle position sensor harness is open or shorted
• Poor electrical connection in throttle position sensor circuit

How to Fix P1121 SUZUKI Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Check engine light on (or service engine soon warning light)

P1121 SUZUKI Meaning

Intermittent throttle position sensor high voltage is the generic description for Suzuki P1121 code, but the manufacturer may have a different description for your vehicle model and year. Currently, we don’t have more information about the Suzuki P1121 OBDII code.

Toyota Code P1121: Possible Causes

• Faulty Accelerator Pedal Position Sensor: An internal malfunction of the sensor can distort the data sent to the computer.

• Electrical Harness Problem: An open circuit, short circuit, or damaged wires in the harness connected to the sensor.

• Defective Electrical Connections: Oxidation, corroded, bent, or improperly engaged pins in the circuit connectors.

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Common Symptoms

• 🔥 Check Engine Light On (or pre-ignition in “limp home” mode).

• Unstable idle or delayed throttle response.

• Loss of power or reduced performance mode (engine speed limitation).

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Meaning of Code P1121
The Accelerator Pedal Position Sensor (APPS) is located on the throttle body and integrates two potentiometers to accurately measure the pedal opening angle. These sensors send variable signals (0-5 V) to the VPA and VPA2 terminals of the engine control module (ECM), allowing it to control the throttle opening based on accelerator pedal input.

In case of an anomaly (such as P1121), the ECM can:

1. Activate the check engine light and record the fault code.

2. Switch to a safe mode (throttle closed by return spring, reduced power).

3. If code P1120 is also present, cut power to the throttle motor and deactivate the magnetic clutch.

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Diagnostic and Repair Procedure

1. Visual Inspection

   • Check the sensor’s electrical harness: Look for cut, burned, or damaged insulation wires.

   • Inspect the connectors: Clean oxidized pins, ensure they are properly aligned and secured.

2. APPS Sensor Test

   • Using a multimeter, measure the voltage between the VPA/VPA2 terminals and ground. The voltage should gradually vary from 0.5 V to 4.5 V when the pedal is depressed.

   • Compare the values with those specified in the Toyota technical manual.

3. Reference and Ground Check

   • Ensure the sensor receives a stable 5 V power supply and that the circuit ground is intact.

4. Replacement or Repair

   • If the sensor is faulty, replace it with an OEM part.

   • Repair or replace the damaged harness using waterproof connectors to prevent future corrosion.

5. Code Clearing and Test

   • Use a diagnostic tool to clear the P1121 code.

   • Perform a road test to confirm the symptoms have disappeared.

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Important Tip
If the problem persists after these checks, consult a professional equipped with an advanced diagnostic tool. ECM malfunctions or throttle calibration errors may require specific expertise.

Note: Regular maintenance of electronic systems prevents the majority of faults related to sensors or connections.

P1121 TOYOTA PRIUS Possible Causes

• Coolant flow control valve (cooling system blocked or obstructed)
• Faulty coolant flow control valve position sensor
• Coolant flow control valve position sensor harness is open or short-circuited
• Poor electrical connection in the coolant flow control valve position sensor circuit
• Faulty engine control module (ECM)

How to Fix P1121 TOYOTA PRIUS Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding cable harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Check engine light on (or service engine soon warning light)

P1121 TOYOTA PRIUS Meaning

The engine control module (ECM) monitors the water valve position based on the valve position signal emitted by the water valve position sensor (potentiometer), which is coaxially coupled to the valve. The water valve performs three-stage control as shown above, and the ECM determines the valve position based on the voltage of the respective stage. To ensure proper monitoring of the water valve, the ECM checks for malfunctions by combining the potentiometer output and the coolant heat storage tank (CHS) outlet temperature sensor. If no change occurs in the valve position signal input to the ECM, or if the water valve response signal is very slow, even though the ECM commands the water valve motor to operate, the ECM determines that a malfunction has occurred in the water valve position sensor circuit and sets a diagnostic trouble code (DTC).

P1121 VOLKSWAGEN Possible Causes

• Faulty HO2 sensor, Bank 2 Sensor 2
• HO2 Sensor Bank 2 Sensor 2 harness is open or shorted
• HO2 Sensor, Bank 2, Sensor 2 circuit, poor electrical connection

How to Fix P1121 VOLKSWAGEN Code?

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

Possible Symptoms

Check Engine Light on (or Service Engine Soon Warning Light)

P1121 VOLKSWAGEN Meaning

HO2S Heater Circuit Short to Ground, Bank 2 Sensor 2 is the generic description for Volkswagen P1121 code, but the manufacturer may have a different description for your vehicle model and year. Currently, we don’t have more information about the Volkswagen P1121 OBDII code.

P1122 Possible Causes

• Faulty electronic throttle control actuator
• Electronic throttle control actuator wiring harness open or shorted
• Poor electrical connection in electronic throttle control actuator circuit

How to Fix Code P1122?

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

Possible Symptoms

Check engine light illuminated (or service engine soon warning light)

P1122 Meaning

The electronic throttle control actuator consists of a throttle control motor, throttle position sensor (TPS), etc. The throttle control motor is operated by the engine control module (ECM) and it opens and closes the throttle valve.

The throttle position sensor detects the throttle valve position and the opening/closing speed of the throttle valve and transmits voltage signals to the ECM. The ECM evaluates the current throttle opening angle from these signals and the ECM controls the throttle control motor to make the throttle opening angle properly respond to driving conditions.