SG Smoke Test — Hero

Singapore • VICOM / STA • NEA

Singapore Smoke Test Prep — Checklist, Booking & Tips

Q: What causes smoke test failures in Singapore?

Common reasons include dirty air filters, leaky turbo hoses, worn injectors, malfunctioning DPF sensors or incomplete regeneration, and testing a cold engine. These conditions increase soot and visible smoke during opacity pulls.

Q: How should I prepare the truck before the test?

Warm the engine; ensure the air filter and charge-air hoses are good; clear fault codes; confirm AdBlue and DPF systems are functional; and follow a 48h/24h/day-of checklist.

Q: Is O3 Protégelo allowed and does it replace AdBlue/DPF?

O3 Protégelo is a fuel-side combustion catalyst (not an ECU tune). It does not replace AdBlue or a DPF and should be used alongside normal maintenance. Always verify results at your inspection.

Q: Will O3 Protégelo guarantee a smoke-test pass?

No product can guarantee a pass. Cleaner combustion may help reduce visible smoke, but the result depends on engine condition, after-treatment health, and the inspection procedure.

Q: How long before the test should I start preparation?

Start at least 48 hours prior to address intake/boost leaks, filters and fluids, plan a steady-load drive, and perform final checks on the day of inspection while keeping the engine warm.

Q: Where can I book a slot (VICOM/STA)?

Use the inspection centre websites to view availability and booking policies for heavy vehicles. Bring your appointment reference and required documents on the day.

Use this step‑by‑step guide to prepare your diesel truck for SG inspection. No pass guarantees — just clear prep, maintenance pointers, and logging templates.

Buy O3 Protégelo Kit DIY Install Guide

SG Smoke Test — Requirements

At a Glance

What You Need for SG Smoke Test

Bring valid documents, ensure the engine is healthy, and be on time for your booked slot.

Documents

Vehicle card, insurance, appointment confirmation, and driver ID.

Vehicle State

Warm engine, no visible leaks, clean air filter, proper tyre pressure, no warning lights.

On‑site Process

Identity check → visual check → opacity test sequence → results issued.

SG Smoke Test — Checklist

Checklist

48 Hours • 24 Hours • Day‑Of

Follow these steps to reduce visible smoke and avoid common fails.

48 Hours Before

Change/clean air filter if due; check turbo hoses for leaks.
Confirm AdBlue/DPF systems are functional; clear faults.
Add O3 Protégelo per dosage chart (optional) and start logging.
Inspect injectors for obvious dribble; check fuel quality.

24 Hours Before

Top up engine oil and coolant; fix minor exhaust leaks.
Plan a steady‑load drive to help burn off soot.
Ensure tyres are at correct pressure; remove excess load.
Prepare documents and booking confirmation.

Day of Test

Arrive early; keep engine warm (do not idle excessively).
Do quick rev checks; watch for abnormal smoke plumes.
Switch off AC and non‑essential power draws before test.
Follow inspector instructions precisely during opacity pulls.

SG Smoke Test — Fails & Fixes

Avoid These

Common Fail Reasons & Quick Fixes

Dirty Air or Leaky Hoses

Replace/clean air filter; tighten/replace cracked turbo hoses to stabilise air‑fuel mix.

Injector Issues

Look for dribble, poor atomisation; consider cleaning/service if rough idle or smoke spike.

DPF Not Functioning

Check for dashboard warnings; complete a proper regen; fix sensors before test.

Cold Engine at Test

Arrive with engine warm; avoid long idle in queue; keep revs stable during pulls.

SG Smoke Test — Booking & Centres

Booking

Book a Slot & Find a Centre

VICOM

Book online or by phone. Bring appointment reference and arrive early.

Visit VICOM

STA

Check test types and available times. Confirm heavy vehicle capacity.

Visit STA

SG Smoke Test — FAQ

FAQ

Singapore Smoke Test — Quick Answers

Short, useful responses for drivers and fleet managers. No guarantees — always verify at inspection.

QWhat causes smoke test failures in Singapore?

Excess soot from poor combustion or after‑treatment faults. Typical issues: dirty air filter, leaky turbo hoses, worn injectors, malfunctioning DPF sensors/regen, or a cold engine at test time.

QHow should I prepare the truck before the test?

Warm the engine, ensure air filter and hoses are good, clear any fault codes, and confirm AdBlue/DPF systems are functional. Follow the 48h • 24h • day‑of checklist.

QIs O3 Protégelo allowed and does it replace AdBlue/DPF?

O3 Protégelo is a fuel‑side combustion catalyst (not an ECU tune). It does not replace AdBlue or a DPF and should be used alongside normal maintenance. Always verify results at your inspection.

QWill O3 Protégelo guarantee a smoke‑test pass?

No product can guarantee a pass. Cleaner combustion can help reduce visible smoke, but inspection results depend on overall engine condition, after‑treatment health, and test procedure.

QHow long before the test should I start preparation?

Begin at least 48 hours prior: address air/boost leaks, check filters/fluids, and plan a steady‑load drive. Do final checks on the day of inspection while keeping the engine warm.

QWhere can I book a slot (VICOM/STA)?

Check the inspection centre websites for heavy‑vehicle availability and booking policies. Bring your appointment reference and valid documents. (Add your booking links here when ready.)

SG Smoke Test — Final CTA

Prep Done? Order the O3 Protégelo Kit

DIY setup with clear guidance. Use the checklist above and verify results with your own inspection.

Buy O3 Protégelo Kit DIY Install Guide