P0122 Lexus Code - Throttle / Pedal Position Sensor / Switch 'A' Circuit Low Input
Quick Answer
The P0122 diagnostic trouble code (DTC) for Lexus vehicles indicates an issue with the Throttle/Pedal Position Sensor/Switch 'A' Circuit, specifically a low input signal. Common causes include Faulty throttle position sensor, Damaged or corroded wiring/connectors in the sensor circuit, Issues with the ECM or related control modules. 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
- P0122 Lexus indicates Throttle / Pedal Position Sensor / Switch 'A' Circuit Low Input.
- Common causes
- Common causes include Faulty throttle position sensor, Damaged or corroded wiring/connectors in the sensor circuit, Issues with the ECM or related control modules.
- 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 P0122 Lexus Description
The P0122 diagnostic trouble code (DTC) for Lexus vehicles indicates an issue with the Throttle/Pedal Position Sensor/Switch 'A' Circuit, specifically a low input signal. This sensor is crucial for the proper functioning of the electronic throttle control system in modern vehicles. The throttle position sensor (TPS) is responsible for monitoring the position of the throttle pedal and sending this information to the engine control module (ECM). The ECM uses this data to adjust the air-fuel mixture and control the engine's performance.
Common Causes of P0122 Lexus
- Faulty throttle position sensor
- Damaged or corroded wiring/connectors in the sensor circuit
- Issues with the ECM or related control modules
- Vacuum leaks in the intake system
- Mechanical issues with the throttle body or pedal assembly
Symptoms of P0122 Lexus
- Poor acceleration or lack of power
- Rough idling or stalling
- Delayed response when pressing the gas pedal
- Check Engine Light illuminated on the dashboard
How to Fix P0122 Lexus
- Begin by using an OBD-II scanner to confirm the P0122 code and ensure it is not a false alarm.
- Inspect the throttle position sensor and its wiring for any visible damage or corrosion. Replace the sensor if necessary.
- Check the wiring harness and connectors for any signs of wear or poor connections. Repair or replace as needed.
- Test the throttle body and pedal assembly for proper operation and adjust or replace components if required.
- Clear the DTC and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P0122 Lexus
The cost of repairing a P0122 code on a Lexus vehicle can vary depending on the specific model and the extent of the issue. In general, replacing a throttle position sensor can cost between $100 and $200, including parts and labor. However, additional diagnostic time and labor costs may apply, so it is advisable to consult with a qualified mechanic or dealership for a more accurate estimate. Keep in mind that labor rates at auto repair shops can range from $80 to $150 per hour, so location and other factors can impact the final cost.
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