P2433 low

Secondary Air Injection System Air Flow/Pressure Sensor Circuit High - Bank 2

The P2433 code means the vehicle's onboard diagnostic system has detected: Secondary Air Injection System Air Flow/Pressure Sensor Circuit High - Bank 2. This is a low severity code.

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Keep driving?
Yes, but fix soon
DIY difficulty
moderate
Estimated cost
$100 - $400 (parts and labor)
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Common Symptoms

  • Check Engine Light illuminated
  • Failed emissions inspection
  • No effect on driving performance
  • Secondary air injection system fault warning
  • Cold start emissions slightly higher

Probable Causes (Ranked by Likelihood)

  • Open circuit in secondary air pressure sensor wiring Very High
  • Disconnected sensor connector High
  • Failed sensor with open internal circuit Moderate
  • Broken wire in engine harness to sensor Moderate

Step-by-Step Diagnostic Procedure

  1. Check if the sensor connector is plugged in securely

  2. Measure sensor signal voltage (should not be at reference voltage with pump running)

  3. Inspect wiring for open circuits between ECM and sensor

  4. Check for rodent damage to engine wiring

  5. Verify sensor continuity with an ohmmeter

Frequently Asked Questions

Can I drive with code P2433?

Yes, completely safe to drive. This code only affects the secondary air injection monitoring and has no impact on driving.

What causes P2433?

Usually a disconnected sensor connector or open wiring. Check the connector first for a free fix. Rodent damage to wiring is also common.

Is P2433 expensive to fix?

Typically $100 to $400. A disconnected connector costs nothing. Sensor replacement is affordable and straightforward.

Sources

This page is built from documented references. Verify against your own service info before repair work.

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