Acura OBD-II Error Code P1131

Acura OBD-II Major Ignition System / Misfire

Model: OBD-II | Code: P1131

Applicable Systems
ILX TLX RDX MDX NSX

Symptoms

The ECM has detected a manufacturer-specific ignition system or misfire fault. The check engine light may flash during misfire. DTC P1131 is stored in the Acura engine control module.

Possible Causes

  • Spark plug worn or fouled
  • Ignition coil failure
  • Spark plug gap incorrect
  • Ignition control circuit fault

Troubleshooting Steps

  1. Step 1: Connect an OBD-II scanner and read DTCs to confirm P1131
    DTC P1131 present with freeze frame data
  2. Step 2: Inspect wiring and connectors in the affected circuit for damage, corrosion, or loose pins
    Wiring intact, connectors clean and seated
  3. Step 3: Perform component-level testing per manufacturer service manual
    Component values within spec or component confirmed faulty
  4. 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 Acura dealership)

Frequently Asked Questions

  • Q: What does P1131 mean?

    This manufacturer-specific DTC indicates a ignition system / misfire system fault. Refer to the vehicle's service manual for the exact diagnostic procedure.

  • Q: Can I drive with P1131?

    Limited driving is possible, but the affected system may not operate correctly. Have the vehicle diagnosed promptly to prevent potential damage.

Related Acura Fault Codes

Comments (0)

Share your experience to help others facing the same problem.

No comments yet. Be the first to share your experience!

Leave a Comment

Source: SAE J2012 Acura Manufacturer-Specific DTC

Category: OBD-II