P0120 2001 Toyota Corolla Code - Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction 3ZZ-FE Engine
Quick Answer
The throttle position sensor (TPS) responds to the accelerator pedal movement. Common causes include Faulty Throttle Position Sensor, Throttle Position Sensor circuit is open or shorted, Throttle Position Sensor 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
- P0120 2001 Toyota Corolla indicates Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction 3ZZ-FE Engine.
- Common causes
- Common causes include Faulty Throttle Position Sensor, Throttle Position Sensor circuit is open or shorted, Throttle Position Sensor 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.
Code P0120 2001 Toyota Corolla Description
Idle position of the throttle valve is determined by the ECM receiving the signal from the throttle position sensor. This sensor controls engine operation such as fuel cut. On the other hand, the Wide open and closed throttle position switch, which is built into the throttle position sensor unit, is not used for engine control.
What are the Possible Causes of the DTC P0120 2001 Toyota Corolla?
- Faulty Throttle Position Sensor
- Throttle Position Sensor circuit is open or shorted
- Throttle Position Sensor poor electrical connection
How to Fix the DTC P0120 2001 Toyota Corolla?
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.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0120 2001 Toyota Corolla 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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Frequently Asked Questions about P0120 2001 Toyota Corolla Code
1. What are the common symptoms of OBDII code P0120 in a 2001 Toyota Corolla with a 3ZZ-FE engine?
The common symptoms of P0120 in a 2001 Toyota Corolla include issues with acceleration, unresponsive throttle pedal, engine stalling, and the vehicle going into "limp mode."
2. What are the possible causes of the Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction code in a 2001 Toyota Corolla?
The possible causes of P0120 in a 2001 Toyota Corolla with a 3ZZ-FE engine include a faulty throttle position sensor, damaged wiring or connectors in the sensor circuit, or a problem with the engine control module.
3. How can I diagnose the Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction in my 2001 Toyota Corolla?
To diagnose P0120, you can use an OBDII scanner to read the trouble codes, visually inspect the throttle position sensor and its wiring, perform a voltage check on the sensor, and conduct a continuity test on the sensor circuit.
4. Can I drive my 2001 Toyota Corolla with OBDII code P0120?
It is not recommended to drive your Corolla with code P0120 as it can lead to poor performance, stalling, and safety issues. It's best to address the problem promptly to avoid further damage.
5. How do I repair OBDII code P0120 in my 2001 Toyota Corolla?
The repair for P0120 may involve replacing the throttle position sensor, repairing damaged wiring or connectors, or reprogramming the engine control module. It's advisable to consult a qualified mechanic for accurate diagnosis and repair.
6. Is it safe to reset the OBDII code P0120 in my 2001 Toyota Corolla without fixing the underlying issue?
Resetting the code without addressing the root cause may temporarily turn off the Check Engine Light, but the issue will likely recur. It's crucial to fix the problem causing P0120 to ensure safe and reliable vehicle operation.
7. Will a faulty throttle position sensor cause poor fuel economy in a 2001 Toyota Corolla?
Yes, a faulty throttle position sensor contributing to P0120 can lead to poor fuel economy in your Corolla. It affects the engine's air-fuel ratio and performance, resulting in decreased mileage.
8. Can extreme weather conditions affect the throttle position sensor in a 2001 Toyota Corolla?
Extreme weather conditions, such as extreme heat or cold, can potentially impact the throttle position sensor's performance and lead to issues like P0120. It's essential to keep the sensor and its connections clean and well-maintained.
9. How much does it cost to replace a throttle position sensor in a 2001 Toyota Corolla?
The cost of replacing a throttle position sensor in a 2001 Toyota Corolla can vary depending on the brand, labor costs, and location. On average, you can expect to pay between $100 to $300 for the part and labor.
10. Can a DIY enthusiast replace the throttle position sensor in a 2001 Toyota Corolla?
Replacing the throttle position sensor in a 2001 Toyota Corolla can be a DIY project for those with mechanical skills and the right tools. However, if you're unsure, it's best to seek professional help to ensure proper installation and avoid further issues.
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