The P0303 diagnostic trouble code on your 2022 Lexus NX indicates the engine control module has detected consistent misfires in cylinder 3. The completely redesigned 2022 NX introduced new powertrains requiring updated diagnostic approaches.
2022 NX Powertrain Options
The 2022 NX offers the 2.4L turbocharged four-cylinder (NX 350), 2.5L hybrid (NX 350h), or 2.5L plug-in hybrid (NX 450h+). On all inline-4 engines, cylinder 3 is the third cylinder from the front.
Common Causes
- Ignition Coil Failure: Turbo models stress ignition components
- Spark Plug Issues: Turbocharged applications have specific requirements
- Boost System Leaks: NX 350 turbo is sensitive to intake leaks
- Fuel Injector Problems: Direct injection deposits or failures
- Carbon Buildup: GDI technology can cause valve deposits
Diagnostic Approach
Identify your powertrain type first. Use Lexus diagnostic equipment for detailed access. On the turbo NX 350, monitor boost pressure. Test ignition components systematically. Check for TSBs on the new platform.
Repair Solutions
Replace failed ignition coils with Denso OEM parts. Install Lexus-specified spark plugs. Repair boost leaks on turbo models. Address carbon buildup through professional intake cleaning.