The 2022 Audi A6 delivers executive sedan performance with choice of powerful TFSI engines. When your A6 displays a P0304 code indicating a cylinder 4 misfire, understanding your engine configuration helps target accurate diagnosis.
Understanding P0304 in the A6
The 2022 A6 offers the 2.0L turbocharged four-cylinder (A6 45) or 3.0L turbocharged V6 (A6 55). For the four-cylinder, cylinder 4 is at the rear of the engine. For the V6, cylinder 4 is on the rear of the left bank. Both use individual coil-on-plug ignition.
TFSI Engine Considerations
Both A6 engines use TFSI direct injection technology that can develop carbon buildup on intake valves. The turbocharged environment accelerates spark plug wear. The V6 includes mild hybrid technology that adds slight complexity to diagnosis.
Diagnostic Approach
Identify your engine and access cylinder 4 accordingly. Inspect spark plug condition. Check for boost leaks. On higher-mileage vehicles, intake valve carbon inspection may be warranted.
Resolution Process
Replace spark plugs with Audi specifications. Test ignition coil output. If carbon buildup is suspected, cleaning may be necessary. Address any boost system issues.