Emissions System Problem Honda

I love Hondas because they are dependable; as a mechanic, I have had fewer Hondas in for repairs than cars from other brands.

However, I have recently had a few Honda Civics come in for repairs that were emissions related, and most had the same issue ” Emissions System problem” message displayed on the driver’s instrument cluster.

In this article, I will go through what it means when your Civic Displays “Emissions system problem,” the leading causes, and how to fix the issue. Let’s jump to it.

What Does Honda Civic’s “Emission System Problem” Mean?

Two components make up your car’s emissions system: the catalytic converter and the Exhaust.

The catalytic converter is responsible for reducing harmful exhaust gases into less toxic byproducts; it uses platinum and palladium as catalysts that speed up chemical reactions in the engine.

The Exhaust releases these less toxic byproducts from the catalytic converter into the atmosphere.

When your Honda Civic Displays “Emission System Problem,” it means the Emissions sensors detected an issue with the emission system, which various factors, including things unrelated to the catalytic converter or the Exhaust, can cause. Let’s look at the common causes.

Emissions System Problem on a Honda Civic Main Causes

Since many things can cause this fault, I decided to list them based on the most common cause in my experience.

Faulty Oxygen Sensors:

The most common cause I found is lousy O2 sensors. The oxygen sensor sits on the exhaust manifold and sends a signal to the ECU, telling it how much oxygen is in the exhaust gas that comes from your car’s engine.

This allows your Honda Civic to adjust its fuel delivery according to what’s needed at any given time.

If there’s too much or too little oxygen in the Exhaust, then this will throw off the whole system and cause an emissions fault code.

Fortunately, this is a simple fix, and the oxygen sensor only costs a few dollars. If you need help replacing this part, I recommend heading over to YouTube and watching some videos on how to do it.

It’s not too difficult but requires special tools like a ratchet and socket set or an impact driver that can reach tight places.

If you are not too handy, taking your Civic to the nearest dealer should do the job.

Clogged/Dirty Catalytic Converter:

The catalytic converter is a device that converts harmful emissions from your car’s engine into less harmful ones.

It does this by sensing when an abnormal amount of exhaust gases are coming through and then burns off the excess so only air and carbon dioxide is left.

Honda Civic catalytic converters get dirty and clogged over time, which can cause a few emissions and power issues; you can use a reputable catalytic Converter cleaner or have the Honda dealership do it for you, which is what I recommend.

Dirty Fuel Injectors:

The fuel injectors in your Civic supply an even amount of fuel to the engine.

They do this by spraying a fine mist of gas into the combustion chambers so that it mixes with air and ignites.

If your fuel injectors are clogged or dirty, they won’t be able to mix the right amount of fuel with air, which can cause a few problems, including emissions in your Civic.

Fuel injectors are crucial for the engine to operate efficiently. The best way to tell if fuel injectors cause this issue is if your Honda is experiencing other issues like misfiring, idling vibrations, and the Rpm gauge moving up and down.

Harmful/Open Gas Cap:

This is not a typo; a lousy gas cap can cause an emissions problem on your Civic; in fact, it is so familiar with civics that the gas cap goes wrong, and when it does, it can cause a variety of issues, including poor fuel economy, rough idle, and emissions.

Check your gas cap to see if it is still in good condition and closed as it should be. If your gas cap is wrong, I advise replacing it with one from an OEM Honda part store because they are made to fit perfectly and are made better than aftermarket ones.

Can You Drive with Emissions System Problem?

The answer is yes, but as an experienced mechanic, I recommend doing that too low since the emissions problem is caused by many things that don’t affect the engine.

Some causes directly do, like the injectors; driving with faulty injectors too long can damage the engine.

I recommend taking your Civic to the nearest Honda Dealer for diagnostics and repairs.