The P0303 diagnostic trouble code on your 2022 Audi A6 indicates the engine control module has detected consistent misfires in cylinder 3. The luxury sedan offers both four-cylinder and V6 turbocharged powertrains.
2022 A6 Engine Options
The 2022 A6 offers the 2.0L TFSI turbocharged four-cylinder (A6 45) or 3.0L TFSI turbocharged V6 (A6 55). On the inline-4, cylinder 3 is third from the front. On the V6, cylinder 3 is located on one of the engine banks.
Common Causes
- Ignition Coil Failure: Both TFSI engines use coil-on-plug ignition
- Spark Plug Issues: Audi's turbos require specific spark plugs
- Boost System Leaks: Turbo systems sensitive to intake leaks
- Fuel Injector Problems: Direct injection deposits or failures
- PCV System Issues: Crankcase ventilation system failures
Diagnostic Approach
Use VCDS or OBDeleven for detailed Audi diagnostics. Monitor misfire counts and boost pressure. Test ignition components through swap testing. Check for known issues on your specific engine variant.
Repair Solutions
Replace failed ignition coils with OEM-quality parts. Install engine-appropriate spark plugs. Repair boost system leaks. Address PCV valve failures. Dealer service recommended for complex issues.