P0300 – Random or multiple cylinder misfire
- System
- Engine - ignition
- Dashboard light
- Check engine light (MIL)
- Check-engine blink code
- —
- Applies to
- 1SZ-FE (by platform)
- Description
- Random or multiple cylinder misfire
- Possible causes
- Trouble area: 1.Spark plugs 2.Ignition coils or wiring 3.Injectors 4.Low fuel pressure 5.Compression or valve fault 6.Air leak
- What to check
- Checking points: 1.Check spark plugs 2.Swap coils between cylinders to see if the misfire moves 3.Check injectors and fuel pressure 4.Check compression
- Confidence
- medium (Toyota Echo 1999–2002 factory diagnostics, same XP10 platform; not confirmed on JDM 1SZ-FE)
From the factory service material. Clear the code and test-drive to confirm it returns. Search all fault codes · Common problems · Warning lights