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Engine-Codes – Toyota – P0120 1999 Toyota Camry

P0120 1999 Toyota Camry Code - Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction

Quick Answer

The P0120 diagnostic trouble code (DTC) in a 1999 Toyota Camry indicates a malfunction in the throttle pedal position sensor/switch 'A' circuit. Common causes include Faulty throttle pedal position sensor, Damaged wiring or connectors in the sensor circuit, ECM software issues. 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 1999 Toyota Camry indicates Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction.
Common causes
Common causes include Faulty throttle pedal position sensor, Damaged wiring or connectors in the sensor circuit, ECM software issues.
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 Aug 30, 2024
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Code P0120 1999 Toyota Camry Description

The P0120 diagnostic trouble code (DTC) in a 1999 Toyota Camry indicates a malfunction in the throttle pedal position sensor/switch 'A' circuit. This sensor is responsible for monitoring the position of the throttle pedal and sending signals to the engine control module (ECM) to adjust the throttle opening accordingly. When this sensor fails or malfunctions, it can lead to incorrect throttle responses, affecting the vehicle's performance and drivability.

OBDII Code P0120 1999 Toyota Camry - Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction
P0120 1999 Toyota Camry Code - Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction

Common Causes of P0120 1999 Toyota Camry

  1. Faulty throttle pedal position sensor
  2. Damaged wiring or connectors in the sensor circuit
  3. ECM software issues
  4. Corrosion or contamination in the sensor connections
  5. Mechanical issues with the throttle pedal assembly

Symptoms of P0120 1999 Toyota Camry

  1. Rough idling or fluctuating engine speed
  2. Lack of power or hesitation during acceleration
  3. Engine stalling or difficulty starting
  4. Check Engine Light (CEL) illuminated
  5. Reduced fuel efficiency

How to Fix P0120 1999 Toyota Camry

  1. Perform a thorough inspection of the throttle pedal position sensor and its wiring harness for any visible damage or corrosion.
  2. Test the sensor's functionality using a multimeter to check for proper voltage and resistance readings.
  3. Replace the throttle pedal position sensor if it fails the diagnostic tests.
  4. Clear the DTC and reset the ECM to ensure the code does not reappear.
  5. Test drive the vehicle to confirm that the issue has been resolved and monitor for any recurrence of symptoms.

Cost to Fix P0120 1999 Toyota Camry

The cost of repairing a throttle pedal position sensor issue in a 1999 Toyota Camry can vary depending on the specific cause of the problem and the cost of parts and labor in your area. On average, you can expect to pay between $150 to $300 for parts and labor. Keep in mind that diagnostic time and labor rates at auto repair shops can vary, so it's best to obtain a personalized estimate from a trusted mechanic.

What does this mean?

Tech Notes for P0120 1999 Toyota Camry

Very common problem with Toyota models. Before replacing any parts, try cleaning the throttle body and reset the light. If the codes come back, then it will necessary to replaced the throttle position sensor (TPS).

When is the Code Detected?

Malfunction is detected when an excessively low or high voltage from the sensor is sent to ECM.

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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 P0120 1999 Toyota Camry Code

1. What are the common symptoms of OBDII code P0120 in a 1999 Toyota Camry?

The common symptoms of OBDII code P0120 in a 1999 Toyota Camry include issues with acceleration, reduced engine power, and possible stalling.

2. What does the OBDII code P0120 indicate in a 1999 Toyota Camry?

OBDII code P0120 indicates a Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction in a 1999 Toyota Camry.

3. What are the possible causes of OBDII code P0120 in a 1999 Toyota Camry?

Possible causes of OBDII code P0120 in a 1999 Toyota Camry include a faulty throttle position sensor, damaged wiring or connectors, or a problem with the throttle body.

4. How can I diagnose the OBDII code P0120 in my 1999 Toyota Camry?

To diagnose OBDII code P0120 in a 1999 Toyota Camry, you can use an OBDII scanner to read the code, check the throttle position sensor for proper operation, and inspect the wiring and connectors for any damage.

5. Can I continue driving my 1999 Toyota Camry with OBDII code P0120?

It is not recommended to continue driving your 1999 Toyota Camry with OBDII code P0120, as it can lead to further damage to the vehicle and potentially unsafe driving conditions.

6. How can I repair OBDII code P0120 in my 1999 Toyota Camry?

To repair OBDII code P0120 in a 1999 Toyota Camry, you may need to replace the throttle position sensor, repair any damaged wiring or connectors, or clean and inspect the throttle body.

7. Will resetting the OBDII code P0120 in my 1999 Toyota Camry make it go away permanently?

Resetting the OBDII code P0120 in a 1999 Toyota Camry may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear.

8. Can a DIY enthusiast fix OBDII code P0120 in a 1999 Toyota Camry?

A DIY enthusiast with automotive repair experience may be able to fix OBDII code P0120 in a 1999 Toyota Camry by following repair guides and using the necessary tools.

9. How much does it cost to repair OBDII code P0120 in a 1999 Toyota Camry at a repair shop?

The cost to repair OBDII code P0120 in a 1999 Toyota Camry at a repair shop can vary depending on the specific issue, parts needed, and labor costs involved. It's recommended to obtain a quote from a reputable repair shop.

10. Is it common for the throttle position sensor to fail in a 1999 Toyota Camry, leading to OBDII code P0120?

Yes, it is relatively common for the throttle position sensor to fail in a 1999 Toyota Camry, causing OBDII code P0120 due to wear and tear over time.

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