P1349
VVT System Malfunction (Bank 1)
Moderate· Fix soonIntermediatePowertrainManufacturer: Toyota / Lexus
What it means
On older Toyota and Lexus engines the variable valve timing system on bank 1 is not working as commanded.
Is it safe to drive?
Drivable, but idle and power may suffer. Check the oil.
Symptoms
- Check engine light on
- Rough idle
- Poor power
Probable causes
Most likely first
- 1Low or sludged oil
- 2Clogged oil control valve screen
- 3Failed oil control valve
- 4Timing chain issue
How to diagnose it
Work through these in order before buying parts
- 1Check oil level and condition.
- 2Inspect the oil control valve and its filter.
- 3Check for technical service bulletins (TSBs) or software updates for your make and model; some codes have known factory fixes.
Common fixes
- Oil change
- Replace the oil control valve or its filter
This information is general guidance for the listed makes. Exact causes, specifications and procedures vary by vehicle, so confirm with your service manual or a qualified mechanic before replacing parts.