P0343
Ignition System / Misfire — Code P0343
high
i Description
Diagnostic trouble code P0343 relates to the ignition system / misfire. The vehicle's control module has detected a fault condition in this circuit or system. Consult a manufacturer-specific service manual for detailed information about this code for your particular vehicle.
? Common Causes
- Worn spark plugs
- Faulty ignition coil
- Fuel delivery issue
- Compression loss
! Symptoms
- Check engine light (flashing)
- Engine vibration
- Loss of power
- Rough idle
# Diagnostic Steps
- Check spark plugs and leads
- Test ignition coils
- Perform compression test
- Inspect fuel injectors
⚙ Typical Fix
Diagnose and repair the ignition system / misfire fault. Inspect wiring, connectors, and the related component. Replace as necessary.
Parts Needed
Refer to manufacturer service manual for specific parts
Estimated Cost
$100-$400
↔ Related Codes
Q Frequently Asked Questions
Code P0343 indicates a potentially serious issue with the ignition system / misfire. Have it diagnosed as soon as possible to avoid further damage or safety concerns.
Repair costs vary depending on the specific cause. For ignition system / misfire issues, expect to pay $100-$400 in Australia, including parts and labour. Get a proper diagnosis before committing to repairs.
☞ Learn More
- What is OBD-II? — Complete guide to your car's diagnostic system
- How to Read DTC Codes — Step-by-step with a Bluetooth scanner
- OBD-II Scanner Buying Guide — Find the best scanner for your car