P1401 Lexus Code - Sub-Throttle Position Sensor Range/Performance Problem
Quick Answer
P1401 Lexus indicates Sub-Throttle Position Sensor Range/Performance Problem. Common causes include Faulty Sub-Throttle Position Sensor, Sub-Throttle Position Sensor harness is open or shorted, Sub-Throttle Position Sensor circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
- What it means
- P1401 Lexus indicates Sub-Throttle Position Sensor Range/Performance Problem.
- Common causes
- Common causes include Faulty Sub-Throttle Position Sensor, Sub-Throttle Position Sensor harness is open or shorted, Sub-Throttle Position Sensor circuit poor electrical connection.
- Severity
- Moderate - service should be scheduled soon.
- Can I drive?
- The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
Code P1401 Lexus Description
What are the Possible Causes of the DTC P1401 Lexus?
- Faulty Sub-Throttle Position Sensor
- Sub-Throttle Position Sensor harness is open or shorted
- Sub-Throttle Position Sensor circuit poor electrical connection
How to Fix the DTC P1401 Lexus?
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.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1401 Lexus 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 P1401 Lexus Code
1. What does the OBDII code P1401 mean on a Lexus?
P1401 indicates a "Sub-Throttle Position Sensor Range/Performance Problem," meaning the sensor is not operating within the expected range or is sending incorrect signals to the engine control module (ECM).
2. What are the common symptoms of code P1401 in a Lexus?
Symptoms may include poor engine performance, reduced acceleration, rough idling, an illuminated check engine light, and, in some cases, the vehicle entering limp mode.
3. What causes the P1401 code to appear on a Lexus?
Common causes include a faulty sub-throttle position sensor, damaged wiring or connectors, a misaligned throttle body, or issues with the ECM.
4. Can I drive my Lexus with the P1401 code?
It is possible to drive the vehicle short-term, but it is not recommended as it may lead to poor performance, reduced fuel efficiency, or damage to the engine or other components.
5. How is the P1401 code diagnosed on a Lexus?
A mechanic will use a scan tool to confirm the code, inspect the sub-throttle position sensor and its wiring, and use a multimeter to test the sensor's voltage and resistance for abnormalities.
6. How do I fix the P1401 code on my Lexus?
Repairs may include replacing the sub-throttle position sensor, repairing damaged wiring or connectors, cleaning or realigning the throttle body, or reprogramming the ECM if necessary.
7. How much does it cost to fix the P1401 code on a Lexus?
The repair cost varies, but replacing the sub-throttle position sensor typically costs $150–$300, including parts and labor. Additional wiring or throttle body repairs could increase the cost.
8. Can a dirty throttle body cause the P1401 code in a Lexus?
Yes, a dirty or misaligned throttle body can disrupt the sub-throttle position sensor's function, potentially triggering the P1401 code.
9. Does the P1401 code always mean the sensor is faulty?
No, the code could also be caused by wiring issues, ECM problems, or throttle body misalignment, so proper diagnosis is essential.
10. Will clearing the P1401 code fix the problem on my Lexus?
Clearing the code may temporarily turn off the check engine light, but the underlying issue must be fixed to prevent the code from returning.
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