P2431 — Secondary Air Injection System Air Flow/Pressure Sensor Circuit Range/Performance Bank 1

OBD2 code P2431 flags a problem with the sensor and actuator circuits (secondary air injection system air flow/pressure sensor circuit range/performance bank 1). The car is usually drivable while you plan the repair. Common culprits: open or shorted wiring in the circuit, corroded, loose or damaged connector, blown fuse feeding the circuit.

powertrain (engine/transmission)

Is it safe to drive?

Short-term driving is OK In most cases the car remains drivable, possibly with reduced performance or a disabled auxiliary system. If symptoms include stalling, no-start or brake/steering warnings, treat it as urgent.

How to diagnose with an OBD scanner

Read the code and freeze frame Connect an OBD2 scanner, confirm P2431 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the secondary air injection system air flow/pressure sensor circuit range/performance bank 1 for damage, corrosion, chafing or poor contact.
Subsystem check Measure reference voltage, ground and signal continuity at the component connector.
Subsystem check Wiggle-test the harness while watching the signal in live data — dropouts reveal broken wires.
Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P2431 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for P2431 (parts and labor, USD, independent shop rates): Repair wiring or connectors: $80–$250; Control module repair: $300–$1,000; Replace the faulty sensor or actuator: $150–$500. Overall, fixing P2431 usually costs between $80 and $1,000. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

Is it safe to drive with P2431?

In most cases the car remains drivable, possibly with reduced performance or a disabled auxiliary system. If symptoms include stalling, no-start or brake/steering warnings, treat it as urgent.

Will P2431 clear itself?

Sometimes P2431 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

What does OBD2 code P2431 mean?

What is the most common cause of P2431?

The most common causes are: open or shorted wiring in the circuit, corroded, loose or damaged connector, blown fuse feeding the circuit.

How do I diagnose P2431 myself?

Start with a scan: confirm P2431, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the sensor and actuator circuits, and verify the suspect component against live data before buying parts.

What does P2431 mean?

P2431 (Secondary Air Injection System Air Flow/Pressure Sensor Circuit Range/Performance Bank 1) is stored when self-diagnostics detect abnormal readings or behaviour of the sensor and actuator circuits. It belongs to the powertrain (engine/transmission) category.

“Bank 1” means the side of the engine that contains cylinder 1. Verify which side that is on your specific engine before testing or replacing parts.

This code does not appear from a single bad reading: the module must see the fault condition repeat under defined operating conditions before it turns on the warning light. The freeze frame captured with P2431 — engine load, rpm, temperature, speed — tells you exactly when the problem occurs, so reproduce those conditions when testing.

What causes P2431?

blown fuse feeding the circuit
poor ground connection
corroded, loose or damaged connector
faulty sensor or actuator of the affected circuit
open or shorted wiring in the circuit

Common symptoms of P2431

possible limp mode depending on the affected component
the affected system operates intermittently or not at all
increased fuel consumption in some cases
Check Engine Light on

How to diagnose P2431

Connect an OBD2 scanner, confirm P2431 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
Visually inspect the wiring harness and connectors related to the secondary air injection system air flow/pressure sensor circuit range/performance bank 1 for damage, corrosion, chafing or poor contact.
Measure reference voltage, ground and signal continuity at the component connector.
Wiggle-test the harness while watching the signal in live data — dropouts reveal broken wires.
Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P2431 does not return.

How to fix P2431

Start with the cheapest and most common causes before replacing expensive parts:

Repair wiring or connectors — $80–$250
Control module repair — $300–$1,000
Replace the faulty sensor or actuator — $150–$500

How much does it cost to fix P2431?

Repair cost depends on which component actually failed. Typical scenarios for P2431 (parts and labor, USD, independent shop rates):

Repair wiring or connectors: $80–$250
Control module repair: $300–$1,000
Replace the faulty sensor or actuator: $150–$500

Overall, fixing P2431 usually costs between $80 and $1,000. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Can you drive with P2431?