Infiniti P1146: Infiniti OBD-II Error Code P1146

Symptoms

The ECM has detected a manufacturer-specific auxiliary emission control fault. The check engine light is on. DTC P1146 is stored in the Infiniti engine control module.

Possible Causes

EVAP system leak detected
Purge valve stuck open or closed
EGR valve position fault
Secondary air injection system fault

Troubleshooting Steps

Step 1: Connect an OBD-II scanner and read DTCs to confirm P1146
DTC P1146 present with freeze frame data
Step 2: Inspect wiring and connectors in the affected circuit for damage, corrosion, or loose pins
Wiring intact, connectors clean and seated
Step 3: Perform component-level testing per manufacturer service manual
Component values within spec or component confirmed faulty
Step 4: Repair or replace the faulty component, clear DTC, and verify no return
DTC cleared and does not return after a road test

How to Reset

Clear the DTC after repair using a diagnostic scanner. The code clears automatically if the fault is not detected for 3 consecutive drive cycles.

Common Replacement Parts

varies: Diagnose and replace the confirmed faulty component (Confirm part number via VIN at a Infiniti dealership)

Frequently Asked Questions

Q: What does P1146 mean?
This manufacturer-specific DTC indicates a auxiliary emission controls system fault. Refer to the vehicle's service manual for the exact diagnostic procedure.
Q: Can I drive with P1146?
Limited driving is possible, but the affected system may not operate correctly. Have the vehicle diagnosed promptly to prevent potential damage.

Infiniti OBD-II Error Code P1146