The P1259 code in your 2021 Honda CR-V indicates a problem with the VTEC oil pressure switch circuit. This Honda-specific code signals the ECU is receiving incorrect signals from the switch that monitors VTEC engagement.
VTEC Oil Pressure Switch Function
The oil pressure switch confirms the VTEC system has properly engaged by detecting the increased oil pressure required to operate the rocker arm assembly. P1259 indicates a problem with this confirmation circuit.
Common Causes of P1259
- Faulty oil pressure switch
- Low engine oil or oil pressure
- Wiring damage to switch
- Connector corrosion
- ECU input circuit failure
- Actual VTEC engagement issues
Symptoms of Switch Circuit Issues
- Check engine light on
- VTEC may not engage
- Reduced high-RPM power
- Poor acceleration feel
- Fuel economy decrease
- No VTEC engagement sensation
CR-V Engine Configuration
The CR-V's 1.5L turbo engine uses variable timing for efficiency across the RPM range. Proper VTEC function is important for both power delivery and fuel economy.