P0303 Code: 2022 Acura MDX – What It Means & Cost to Fix

2022 Acura MDX P0303 Code: Cylinder 3 Misfire Diagnosis

A P0303 diagnostic code on your 2022 Acura MDX indicates the engine control module has detected repeated misfires in cylinder 3. The redesigned fourth-generation MDX uses Honda's proven 3.5L V6 with advanced features.

3.5L V6 Engine Configuration

The 2022 MDX uses the J35Y6 3.5L V6 with Variable Cylinder Management (VCM) and direct injection. Cylinder 3 is located on the driver's side (front) bank. The VCM system deactivates cylinders for efficiency, adding diagnostic complexity.

Common Causes

  • Ignition Coil Failure: Individual coil-on-plug units can fail
  • Spark Plug Wear: Honda recommends specific iridium plugs
  • VCM System Issues: Cylinder deactivation components can cause misfires
  • Fuel Injector Problems: Direct injection deposits or failures
  • Carbon Buildup: GDI technology leads to intake valve deposits

Diagnostic Approach

Use a Honda/Acura compatible scanner for detailed diagnostics. Monitor VCM operation and misfire correlation. Check fuel trim data and injector performance. Test ignition components systematically.

Repair Solutions

Replace failed ignition coils with Denso/NGK OEM parts. Install Honda-specified iridium spark plugs. Address VCM-related issues through dealer diagnosis. Consider carbon cleaning for higher mileage vehicles.

Parts & Tools for This Case

Based on our investigation, these parts may be needed for this repair.

As an affiliate, we may earn from qualifying purchases. This does not affect our recommendations. Learn more

Got Another Mystery?

"The game is afoot!" Let our AI detective investigate your next automotive case.

Open a New Case