Match the symptom to the likely cause
The key question: does it crank or is there silence-
An engine that won't start is one of the most stressful situations for any driver. But here's the crucial distinction:
It cranks but won't start → £100-£900
Fuel, spark, or compression issue. Usually fixable.
It doesn't crank → £60-£400
Starter motor or battery issue. Usually fixable.
It won't turn at all → £1,500-£8,000+
Engine seized. This is the nightmare scenario.
In our 24,650 quote dataset, 70% of no-start cases were battery, starter, or alternator issues - not catastrophic engine failure. However, 10% were seized engines, and these are the cases that require replacement.
The key diagnostic question: When you turn the key, does the engine crank (turn over) or is there silence-
No-start issues by make and model
| Vehicle | Common Engine Code | Typical No-Start Issue | Cost Range |
|---|---|---|---|
| BMW 3-Series (E90) | N47 2.0d | Starter motor failure | £250-£450 |
| BMW 5-Series (F10) | N57 3.0d | Battery drain (comfort access) | £150-£600 |
| VW Golf / Audi A3 | EA189 2.0 TDI | Fuel pump/injector failure | £300-£900 |
| Ford Focus / Mondeo | 1.6/2.0 TDCi | Fuel pressure sensor | £150-£400 |
| Ford Fiesta | 1.0 EcoBoost | Wet belt failure - engine seized | £1,500-£3,500 |
| Vauxhall Astra | 1.6/2.0 CDTi | Starter motor | £150-£350 |
| Mercedes C-Class | OM651 2.1d | Diesel fuel system issues | £300-£1,200 |
| Audi A4 / A6 | EA288 2.0 TDI | ECU/immobiliser issues | £200-£600 |
The expensive mistake is assuming it's just the battery
Follow this decision tree to identify the cause
If you suspect a seized engine, stop attempting to start immediately.
Use the symptom pattern to understand the repair range
| Symptom Pattern | What It Means | Typical Repair | Cost Range |
|---|---|---|---|
| Clicking noise, no crank | Dead battery | Battery replacement | £60-£200 |
| Clicking noise, lights dim | Dead battery | Battery replacement | £60-£200 |
| No crank, no click | Starter motor failure | Starter replacement | £100-£400 |
| Cranks slowly, won't start | Weak battery or starter | Battery/starter replacement | £60-£400 |
| Cranks normally, won't start | Fuel/spark/compression | Fuel pump, sensor, injector | £100-£2,000+ |
| Cranks, starts then dies | Immobiliser or fuel issue | ECU, key, fuel pressure | £100-£600 |
| Engine doesn't turn at all | Seized engine | Engine replacement | £1,500-£8,000+ |
| Cranks but no fire (petrol) | Ignition system failure | Coil pack, plugs, sensor | £80-£400 |
⚠️ Seized engine warning - stop attempting to start
If you turn the key and absolutely nothing happens - the engine may be seized. Seized engines cannot be repaired - only replaced.
Signs of a seized engine:
- Silence when you turn the key (no crank, no click)
- Starter motor engages but engine doesn't turn
- Engine locked solid - won't turn with a breaker bar
- Previous symptoms - overheating, oil light, knocking before failure
Do not keep trying to start a seized engine. You'll damage the starter motor and flywheel.
✅ DO:
Stop attempting to start · Arrange recovery to a garage · Get a diagnostic to confirm
❌ DON'T:
Keep trying · Jump start · Push start (will damage transmission)
The cost escalates quickly
| Symptom | Progression | Cost Impact |
|---|---|---|
| Slow crank (battery) | Battery fails completely | £60-£200 |
| Starter clicks | Starter motor burns out | £100-£400 |
| Cranks but won't start | Fuel pump fails | £150-£900 |
| Seized engine | Engine must be replaced | £1,500-£8,000+ |
The cost trap: Attempting to start a seized engine can damage the starter motor and flywheel - adding £200-£600 to the replacement cost.
Don't panic - listen carefully
- Step 1: Don't panic - listen carefully
Turn the key and listen: Clicking → Battery issue. No sound → Starter or seized engine. Cranking sound → Fuel/spark/compression issue. - Step 2: Check the battery
Do lights come on- Are they dim- Try jump starting (if safe). If jump starting works → battery is the issue. - Step 3: Call a professional (£50-£150)
A technician will test battery voltage and condition, check starter motor function, check fuel pressure and spark, test compression if required, and confirm if engine is seized.
Use vehicle value to avoid overspending
“If the engine is seized, replacement is the only option. If the car is worth under £2,000-£4,000, strongly consider scrapping rather than replacing.”
| Vehicle Value | Recommended Action |
|---|---|
| Under £2,000 | Scrap or sell for parts |
| £2,000-£4,000 | Consider used engine (£1,500-£3,000 fitted) |
| £4,000-£10,000 | Consider used or remanufactured engine |
| £10,000+ | Replace with remanufactured engine |
Data confidence and source notes
| Data point | Confidence | Source |
|---|---|---|
| Battery replacement costs | High | 24,650 quote requests (2025) |
| Starter motor costs | High | 24,650 quote requests (2025) |
| Fuel pump replacement costs | High | 24,650 quote requests (2025) |
| Seized engine replacement costs | High | 24,650 quote requests (2025) |
| Seized engine prevalence | Medium-High | 100+ specialist interviews |
| Vehicle-specific issues | Medium | Industry consensus + third-party |
Cost Disclaimer: Pricing is for UK independent specialists (2025-2026). Main dealers may charge 30-50% more. Regional variations apply. Costs exclude VAT unless stated.
Choose your next step
Get the no-start diagnosed first, then compare repair and replacement options before committing to expensive work.
Engine won't start FAQs
What does it mean if my engine won't turn over-
If the engine doesn't crank when you turn the key, it's either a dead battery, failed starter motor, or a seized engine. The most expensive is a seized engine.
Can a seized engine be fixed-
No. Seized engines cannot be repaired - only replaced. The internal damage is too extensive.
How much does a starter motor replacement cost in the UK-
Starter motor replacement costs £100-£400 depending on the vehicle. Labour accounts for most of the cost.
How much does an engine replacement cost in the UK-
Engine replacement costs £1,500-£8,000+ depending on the vehicle and whether you choose used, rebuilt, or new.