Possible Causes
WARNING: This page is about a different car, the 2003 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.
These DTCs use two-trip detection logic. DTC is set when misfiring of random cylinders is detected during any particular 200 or 1000 revolutions. Possible causes are:
- Open or short in engine wiring harness.
- Defective connections at ECM or component.
- Disconnected, restricted or damaged vacuum hose(s).
- Defective vacuum hoses or connections.
- Ignition system malfunction.
- Defective fuel injector(s).
- Improper fuel pressure.
- Defective Mass Airflow (MAF) meter.
- Defective Engine Coolant Temperature (ECT) sensor.
- Improper engine compression.
- Improper valve clearance.
- Improper valve timing.
- Defective ECM.
If misfire cannot be reproduced, reason may be because of driving with lack of fuel, improper fuel, fouled spark plug, etc.