Chery P0300 Fix Cost Australia (2026)
Quick Answer:
60% of P0300 cases are caused by worn spark plugs, costing $150-$300 AUD to replace. If spark plugs are fine, the next most likely cause is a faulty ignition coil ($100-$200 each, 4 coils = $400-$800). Don't ignore P0300 — continued driving can damage the catalytic converter ($1,200-$2,500).
Step-by-Step Diagnosis
- 1
Confirm the Code
Use an OBD2 scanner to read the exact code. P0300 means random/multiple cylinder misfire. If you see P0301, P0302, etc., those indicate specific cylinders — helpful for diagnosis.
- 2
Check Spark Plugs (60% of cases)
Remove spark plugs and inspect. Worn electrodes, black soot, or oil fouling means replacement is needed. Spark plugs cost $15-$30 each (4 cylinders = $60-$120 for parts). Labour: 30-60 minutes.
- 3
Test Ignition Coils (25% of cases)
Swap ignition coils between cylinders. If the misfire moves to a different cylinder (e.g., P0301 becomes P0302), the coil is faulty. Replacement coils cost $100-$200 each. Full set of 4: $400-$800.
- 4
Check Fuel Injectors (10% of cases)
Dirty or clogged fuel injectors can cause misfires. Fuel injector cleaning service: $200-$400. If injectors are faulty, replacement costs $150-$300 each.
- 5
Clear Code and Test
Use OBD2 scanner to clear the code. Drive for 100km to confirm the code doesn't return. If it returns, the issue is not resolved — re-diagnose.
Cost Comparison Australia
| Repair Option | Parts Cost | Labour | Total AUD |
|---|---|---|---|
| Spark Plug Replacement | $60-$120 | $90-$180 | $150-$300 |
| Single Ignition Coil | $100-$200 | $90-$180 | $190-$380 |
| Full Ignition Coil Set (4) | $400-$800 | $180-$360 | $580-$1,160 |
| Fuel Injector Cleaning | $0 | $200-$400 | $200-$400 |
| Catalytic Converter (if damaged) | $1,000-$1,800 | $400-$900 | $1,400-$2,700 |
*Prices based on Australian market data (2026). Labour rates: Dealer $220/hr, Independent $120-$150/hr.
DIY vs Dealer vs Independent
DIY
- ✓ Save $100-$200 labour
- ✓ 30-60 minutes for spark plugs
- ✓ Easy difficulty
- ✗ Need basic tools (spark plug socket)
Independent Mechanic
- ✓ $120-$150/hour labour
- ✓ Same day service
- ✓ Can source aftermarket parts
- ✗ May not honor Chery warranty
Chery Dealer
- ✓ $220/hour labour
- ✓ OEM parts guaranteed
- ✓ Warranty work covered
- ✗ Most expensive option
Frequently Asked Questions
What does P0300 mean on Chery vehicles?
P0300 means "Random/Multiple Cylinder Misfire Detected". The engine computer detects that one or more cylinders aren't firing properly. On Chery Tiggo 4/7/8, the most common causes are worn spark plugs (60% of cases) or faulty ignition coils (25%).
How much does P0300 repair cost in Australia?
Spark plug replacement: $150-$300 AUD (parts + labour). Ignition coil replacement: $400-$800 AUD (4 coils). Fuel injector cleaning: $200-$400. In worst cases (engine damage from prolonged misfire), repairs can exceed $2,000.
Can I drive my Chery with P0300 code?
No — P0300 is a high severity code. Continued driving with a misfire can damage the catalytic converter ($1,200-$2,500) and cause engine damage. Stop driving and get it diagnosed within 1-2 days. If the check engine light is flashing, stop immediately.
How do I fix P0300 on Chery Tiggo 4?
Step 1: Use OBD2 scanner to confirm P0300 code. Step 2: Check for related codes (P0301-P0304 indicate specific cylinders). Step 3: Inspect spark plugs — replace if worn or fouled ($150-$300). Step 4: Test ignition coils — swap between cylinders to identify faulty coil ($100-$200 each). Step 5: Clear code and test drive.
What causes P0300 on Chery vehicles?
Top causes: (1) Worn spark plugs (60% of cases) — replace every 60,000km. (2) Faulty ignition coil (25%) — common on Tiggo 4 2019-2021. (3) Dirty fuel injectors (10%). (4) Vacuum leak or intake gasket failure (5%). Always start with spark plugs — cheapest and most common fix.
Where can I get P0300 fixed in Australia?
Options: (1) Chery dealer — warranty covered if under 7 years, $220/hour labour. (2) Independent mechanic — $120-$150/hour, can source aftermarket spark plugs and coils. (3) DIY — spark plug replacement is easy (30-60 minutes), saves $100-$200 in labour.
Is P0300 covered under Chery warranty?
Chery Australia offers 7-year warranty. P0300 caused by manufacturing defects (e.g., faulty ignition coil) is covered. However, worn spark plugs are considered normal wear and may not be covered after 60,000km. Check your warranty booklet or contact Chery Australia.
How long does P0300 repair take?
Spark plug replacement: 30-60 minutes DIY, 1 hour at dealer. Ignition coil replacement: 1-2 hours. Fuel injector cleaning: 2-3 hours. Most spark plug jobs are same-day service.