P0302 Toyota Highlander
Cylinder 2 Misfire Detected · Powertrain Code · High · Repair: Moderate
What is P0302?
Misfire detected in cylinder 2. Typically caused by a worn spark plug, bad ignition coil, faulty fuel injector, or low compression in that cylinder.
When the Toyota Highlander triggers code P0302 (cylinder 2 misfire detected), it typically points to an issue in the powertrain system. This is a high severity code, so address it promptly to avoid further damage or safety concerns. Below you'll find the most common causes, symptoms, and repair options specific to the Toyota Highlander.
This repair is rated moderate, meaning some experience and specialty tools required.
Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your Toyota Highlander.
Common Causes on Toyota Highlander
- Cylinder 2 misfire — worn or fouled Denso spark plug (SK20R11 or equivalent)
- Failed Denso ignition coil on cylinder 2
- Fuel injector clogged or electrically failed on cylinder 2
- Low compression on cylinder 2 from worn valve seals or piston rings
- Vacuum leak at intake manifold runner for cylinder 2
Symptoms
- Check Engine Light flashing (indicates active misfire — catalytic converter damage possible)
- Rough idle with noticeable vibration
- Loss of power and hesitation on acceleration
- Fuel smell from unburned fuel in exhaust
- Failed emissions test
Notes for Toyota Highlander
On 2GR-FE V6, cylinder 2 is on the rear bank and harder to access — you may need to remove the intake manifold for coil and plug access.