P2431 Lexus Code - Secondary Air Injection System Air Flow/Pressure Sensor Circuit Range/Performance Bank 1
Quick Answer
The Secondary Air injection (AIR) system consists of an air pump, the Air Switching Valve (ASV), a pressure sensor, the Air Injection Control Driver (AID) and the Engine Control Module (ECM). Common causes include Faulty Pressure Sensor, Pressure Sensor harness is open or shorted, Pressure Sensor circuit 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
- P2431 Lexus indicates Secondary Air Injection System Air Flow/Pressure Sensor Circuit Range/Performance Bank 1.
- Common causes
- Common causes include Faulty Pressure Sensor, Pressure Sensor harness is open or shorted, Pressure Sensor circuit 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 P2431 Lexus Description
The AID drives the ASV and the air pump according to command signals transmitted by the ECM. The pressure sensor detects the pressure in the secondary air passage when the AIR system is ON and OFF, and transmits pressure signal to the ECM.
The AID is not only equipped to drive the pump and valve, but also with a diagnosis function to detect malfunctions in the AIR system circuit.
HINT: As a large current is required to drive the air pump and ASV, an AID has been added to the previous system.
What are the Possible Causes of the DTC P2431 Lexus?
- Faulty Pressure Sensor
- Pressure Sensor harness is open or shorted
- Pressure Sensor circuit poor electrical connection
How to Fix the DTC P2431 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 P2431 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.
Need more information about the P2431 Lexus code?
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Frequently Asked Questions about P2431 Lexus Code
1. What does the OBDII code P2431 mean on a Lexus?
P2431 indicates an issue with the Secondary Air Injection System Air Flow/Pressure Sensor Circuit Range/Performance on Bank 1, meaning the sensor is not providing readings within the expected range.
2. What are the common symptoms of a P2431 code on a Lexus?
Symptoms may include the Check Engine Light turning on, rough engine startup, reduced fuel efficiency, and potential failure of emissions tests.
3. What causes the P2431 code on a Lexus?
Common causes include a faulty air flow/pressure sensor, damaged or corroded wiring in the sensor circuit, a malfunctioning secondary air injection pump, or blockages in the air injection system.
4. Can I drive my Lexus with a P2431 code?
While the vehicle may still be drivable, it is not recommended, as the secondary air injection system helps control emissions. Driving with this code can increase emissions and may lead to further damage.
5. How do I diagnose the P2431 code on a Lexus?
Diagnosing the code involves checking the air flow/pressure sensor, inspecting wiring and connectors for damage, testing the secondary air injection pump, and using a scan tool to monitor sensor readings.
6. How do I fix the P2431 code on my Lexus?
Repairs may include replacing the faulty air flow/pressure sensor, repairing or replacing damaged wiring, cleaning blockages in the air injection system, or replacing the secondary air injection pump if it’s malfunctioning.
7. What tools are needed to fix a P2431 code on a Lexus?
You’ll need an OBDII scan tool, a multimeter to test electrical connections, and potentially basic hand tools to access and replace sensors or components.
8. What is the cost of repairing a Lexus with a P2431 code?
Repair costs vary but typically range from $100 to $500, depending on whether you need to replace the sensor, repair wiring, or address other related components.
9. Does the P2431 code affect emissions testing?
Yes, the P2431 code can cause your Lexus to fail an emissions test due to improper functioning of the secondary air injection system.
10. Is the P2431 code specific to Lexus vehicles?
No, while P2431 is not exclusive to Lexus, the specific causes and repairs can vary depending on the make and model of the vehicle. Always refer to Lexus-specific service manuals.
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