P1257
VTEC System Malfunction
Severity
⚠️ MediumCan you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–89 (est.)
Symptoms
- Reduced engine power
- Increased fuel consumption
- Check Engine Light Is On
- Unstable engine idling
- Engine does not go into high power mode
Causes
- Low or poor quality engine oil
- VTEC solenoid malfunction
- Clogged oil filter
- VTEC control circuit problems
- Mechanical damage to VTEC components
How to Fix
- Check the level and condition of the engine oil
- Change oil and oil filter if necessary
- Check the operation of the VTEC solenoid
- Check electrical circuit and connections
- Diagnose mechanical components of the VTEC system