The 2020 Dodge Durango delivers three-row SUV capability with a choice of powerful engine options. When your Durango displays a P0304 code indicating a cylinder 4 misfire, understanding your engine configuration helps target accurate diagnosis.
Understanding P0304 in the Durango
Cylinder 4 location depends on your engine. In the 3.6L Pentastar V6, cylinder 4 is on the rear of the left bank. In the 5.7L HEMI V8, cylinder 4 is on the right (passenger) bank. Both engines use individual coil-on-plug ignition for precise misfire detection.
HEMI MDS Considerations
The 5.7L HEMI in R/T models includes Multi-Displacement System for fuel economy. MDS lifter issues are a documented concern that can cause misfires during cylinder deactivation. The SRT Durango's 6.4L HEMI doesn't use MDS.
Diagnostic Approach
Identify your engine and locate cylinder 4 accordingly. Access the ignition coil and inspect condition. Remove the spark plug and check electrode wear. On 5.7L models, note whether misfires correlate with MDS operation during highway driving.
Repair Strategy
Replace spark plugs with Mopar specifications. Test ignition coil output. On HEMI models with MDS concerns, lifter inspection may be necessary. Ensure correct oil specification for MDS operation.