10 TIPS THAT WILL HELP PASS THE EMISSIONS TEST -

In most countries, there is a car emissions test, also known as a smog test.

Lots of drivers have worries about this. In most countries, if the car doesn’t pass, it is declared not roadworthy, and you can’t participate in traffic.

Well, to avoid this, here are a couple of things you can do before the emissions test that will certainly help to pass it.

Most of these you can do on your own.

Besides this website, you can also watch videos on our YouTube channel, where we have many car-related videos that may help with maintenance, driving, etc.

TIPS THAT WILL HELP YOU PASS AN EMISSIONS TEST

1. CHECK OR CHANGE THE ENGINE OIL

The first thing you can do is to check the engine oil level. If there isn’t enough, be sure to add some.

If the engine oil and filter are due for a change, do it before the emissions test, especially if the engine burns some oil.

Worn-out or low-quality engine oil will directly affect how the engine works and thus the emission gases.

2. CHECK OR CHANGE THE AIR FILTER

Next, and this is super important: check or change the air filter. A dirty or worn-out air filter will cause a disturbance in the air flow, affect the combustion, and the exhaust gases.

So, if the air filter is even near its replacement interval, change it; it will make a big difference.

3. CHECK THE COOLANT LEVEL

Make sure to check the coolant level also.

First of all, a low coolant level can be a heads-up of a bigger problem, like a leak, for instance, so you can solve this problem before the test.

Second, it can cause higher engine temperature than normal, which affects the exhaust gases.

4. FUEL QUALITY WILL AFFECT THE EMISSIONS TEST

Bad fuel will affect the engine’s combustion.

If you suspect the quality of the fuel you use, try to find a gas station that you know has better-quality fuel.

It would be good to pour at least half a gas tank. After that, drive the car with that better fuel for a couple of dozen miles or kilometers, so it can flow through the whole fuel system.

5. INSPECT THE CHECK ENGINE LIGHT PROBLEM

If you have a check engine light warning on the dashboard, inspect it before the emissions test.

A lit-up check engine light will seriously reduce your chances of passing, since, oftentimes, it’s lit up because of problems with the exhaust system on the car.

A bad O2 sensor problem is a good example of this.

On this part, if you can, best use an OBD tool, get an error code, and try this way to pinpoint and solve the problem.

6. CHECK THE GAS TANK CAP

The next tip is often overlooked but can cause, for instance, the mentioned check engine light.

That is a loose or faulty gas cap. If it’s bad, it will let excess air into the system and disturb the air-fuel mixture and thus combustion.

If you notice this problem, immediately buy a new gas cap.

7. WARM UP THE ENGINE BEFORE THE EMISSIONS TEST

Another good thing to do just before the emissions test is to warm up the engine, especially if it’s colder weather outside.

A cold engine has worse exhaust emissions than a warm one. So, if you can, drive the car at least until the temperature gauge needle starts climbing.

8. CHECK THE SPARK PLUGS

If you drive a petrol engine, see when you last changed or checked the spark plugs.

If they are due for replacement or even near, just like with the oil and air filter, best to replace them before the test.

Worn-out, dirty, or even worse, faulty spark plugs will affect the combustion and seriously reduce the possibility of passing.

9. CHECK THE FUEL SYSTEM

A useful thing to do is to check the fuel system. This is a tip that is optional since it would require checking the fuel pressure and fuel injectors.

This demands specific tools or visiting a mechanic, which is a bit complicated and often not necessary.

What you can do is to check when the fuel filter was last replaced and if it’s due, replace it before the test.

10. BE AWARE OF DPF FILTERS, EGR VALVES, AND CATALYTIC CONVERTERS

On almost all cars, you’ll find a DPF filter, a catalytic converter, and an EGR valve.

Know that all of these dramatically affect the emissions, and if they are faulty or clogged, you will not pass the emissions test for sure.

This goes double for diesel cars.

A big issue in solving this problem is the replacement cost if they are faulty. Every one of them is more or less expensive.

But it’s common practice to try and clean them first (except for the catalytic converter).

This is done in specialized shops, and in most cases, cleaning gives good results.

CONCLUSION

In the end, the key to being prepared for an emissions test and to pass it without any problems is to do regular maintenance on your car and do it on time.

By doing this, there will be no fuss, no sudden extra costs, and no worries about whether you will have an available car tomorrow.

Just sit in the car, take the test, and you’ll see, in most cases, there will be no problems.