When your 2019 Honda CR-V triggers the P0304 code, the engine control module has identified consistent misfires in cylinder 4. The 5th generation CR-V uses the 1.5L turbocharged four-cylinder engine.
1.5L Turbo Engine Layout
The 2019 CR-V's 1.5L turbocharged direct-injection engine produces 190 horsepower. Cylinder 4 is the rearmost cylinder, positioned closest to the firewall. This location can affect heat dissipation.
Common Causes
- Ignition Coil Failure: Age and heat exposure cause degradation
- Spark Plug Wear: May be approaching service interval
- Fuel Injector Issues: Direct injection deposits from use
- Carbon Buildup: Common at this age on 1.5L turbo
- Boost System Leaks: Gaskets and connections deteriorate
Diagnostic Approach
Use a Honda-compatible scanner for detailed diagnostics. At this age, systematic testing is important. Monitor misfire counts and boost data. Check for carbon buildup symptoms.
Repair Solutions
Replace ignition coils and spark plugs if not recently done. Carbon cleaning is often beneficial at this mileage. Repair any boost system leaks. Address fuel dilution if present.