Smoke on startup
Brief puff of smoke on startup; can be valve seals, turbo, PCV, or condensation.
MEDIUM RISK
Common symptoms
- See page for quick checks
Cost expectations
Typical costs vary by car and region. Use this as a ballpark.
- DIY / parts: £20–£80
- Garage / labour: £80–£250
Most likely causes (ranked)
Start at the top. Rule out the common, cheap causes before expensive ones.
- Condensation (white steam)
- Valve stem seals (blue puff)
- PCV system pulling oil
- Turbo oil seals
- Overfueling on cold start
Quick checks (fast, low-cost)
Fast checks you can do with basic tools before buying parts.
- Identify smoke colour and duration.
- Check oil consumption trend.
- Inspect PCV and breather hoses.
- Scan cold-start fueling trims.
- If coolant loss exists, test for head gasket.
Recommended tools
These tools make diagnosis faster and stop you buying random parts.
Related fixes
If your symptoms don’t match perfectly, check these next.
What to do next
- If it’s only condensation, it disappears when warm.
- Blue smoke + oil use: investigate PCV/valve seals/turbo.