Emissions System Problem Honda Pilot [Important Guide]

Emissions system problem Honda pilot: You may be concerned when your Honda Pilot dashboard reads “Emissions System Problem” and the engine light glows.

On Honda Pilot vehicles, an Emissions System Problem notice on the dashboard is a common issue that can usually be resolved by replacing the fuel injectors. Around 40,000–60,000 miles, and occasionally much sooner, the warning notice appears. While Honda has yet to issue a recall to fix the problem, dealerships are aware of the situation.

What does Emissions System Problem on a Honda Pilot indicate?

The ECU normally sets one of the following error codes, P0430 or P0420, when the automobile is connected to an OBD-II scanner.

Those error codes usually signal an issue with the catalytic converter; however, if the fuel injectors are changed as soon as the dashboard warning message appears, the converter may not fail.

The P0430 error code indicates a defective oxygen sensor beneath the catalytic converter, but what occurs next is as follows.

Emissions system problem Honda pilot
Emissions system problem Honda pilot

At either end of the converter, there are two oxygen sensors that are powered by the same voltage. The catalytic converter should clean the exhaust while the engine is operating, keeping the voltage between the two sensors constant.

The ECU should be able to determine the amount of fuel given based on the front oxygen sensor if all injectors are spraying the same amount of fuel. The ECU may overfuel to compensate for the shortage of fuel if the gasoline injectors are not spraying the same quantity of fuel.

As a result, the catalytic converter becomes over-saturated with gasoline, causing the P0430 error code to appear.

Related: Catalytic Converter Theft | Which Cars are most likely to have a catalytic converter stolen?

What is the best way to fix a Honda Pilot’s Emissions System?

While some mechanics may try to remedy the problem by resetting the ECU, the problem frequently returns after a few days.

As previously said, some specialists will immediately conclude that your automobile need a catalytic converter repair after reviewing the trouble codes. However, this will not totally resolve the problem. The notice will show again after a few thousand miles.

Further analysis will reveal that the fuel injectors are the source of the problem. Despite the fact that Honda has not issued a recall to remedy this problem, dealerships are aware of it.

The initial step should be to inspect the air filter in the cleaning system.  Dirt, dust, and other foreign particles are removed from the engine’s air stream with the help of this paper element. The filter should be replaced if it becomes clogged or after a year of usage. Dust and grime from the air filter housing should be removed using a clean shop cloth.

Next step, look at the PCV system (Positive Crankcase Ventilation). As a countermeasure to minimize air pollution and sludge formation in the engine, this device feeds blowby gases from the crankcase into the intake manifold. On the PCV valve, look for any clogged, damaged, or missing hoses.

As a third stage, consider using an EVAP (Evaporative Emissions Control) system. The EVAP prevents potentially dangerous fuel vapour from entering the environment. For the most part, this system requires little maintenance, but you should check the hoses, connectors, and canister for any damage.

4th step: Take a closer look at the EGR system (Exhaust Gas Recirculation). The technique reduces NOx emissions produced during the combustion process when extremely high temperatures are present. EGR permits exhaust gases to enter the intake system, which lowers combustion temperature. Check for damage to the vacuum hoses, the operation of the valves, and any clogged pipes or channels.

• Check to see whether your vehicle has a fifth-stage Air Injection System. To help in the consumption of unburned or partially burnt fuel, fresh air is injected into the exhaust ports or catalytic converter, decreasing HC and CO levels. Check for damage to the hoses, lines, check valves, and belt tension.  In certain air injection systems, a pump inlet filter is employed, and it must be updated as needed.

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How to re-set the emission system on a Honda Pilot.

The check engine light on a Honda signifies that the vehicle needs to be serviced. Unfortunately, even when an honda emissions system problem has been totally resolved, the check engine light will not turn off on its own. The light on your 2019 Honda Pilot should turn off after roughly 20-40 miles in most circumstances. If the light remains on after driving over that distance, you can either take the car to a mechanic to have the light code double-checked and reset.

You may also do it on your own. To reset your Honda’s electronic control unit on your own, you’ll need a diagnostic reset tool from Honda. Pulling down on the fuse panel will open it. Before pressing down on the panel cover on some Hondas, the lock knob must be turned counterclockwise.

The fuse cover on some Hondas has retainers on both sides that must be completed before the lid can be removed. Connect the diagnostic reset tool’s pinned connector to the fuse panel input. The reset tool plug can only be inserted into one input slot.

Steps to reset the honda pilot emission system light

Steps to reset emission system light Honda pilot
Steps to reset emission system light Honda pilot

Naturally, before resetting your emission system problem light, you should check for any issues. Your vehicle’s inspection The engine light is crucial for recognizing issues before they become serious or harmful.

• Turn off the ignition when the engine has cooled.

• Wearing safety glasses and gloves, locate the negative connection on your automobile battery. A black cap and a negative sign are the most typical traits. The positive cap will be crimson and emblazoned with a plus sign.

• To loosen the nut on the negative terminal, use a wrench. Disconnect the negative terminal of the battery. Set it to the side for 30–60 seconds.

• After attaching the negative cable, tighten it with your wrench.

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What are the symptoms of a malfunctioning fuel injector?

hond pilot engine

Here are some of the most typical indicators that your fuel injectors are failing, so you can be sure they’re the source of your problem.

The vehicle has a irregular idle.

You could feel the car tremble and splutter while stuck in traffic or at a stoplight. The engine may shake because the fuel injectors aren’t supplying the correct amount of fuel.

Fuel economy is poor.

Your MPG may decrease as a result of defective injectors, since the ECU requests more fuel but does not get it. The less gasoline that reaches the combustion chamber, the lower your MPG. Check out my essay on what DTE stands for if you want to learn more about MPG.

Check Engine Light is Warnings

Your Check Engine warning light will illuminate when the injector stops spraying the correct quantity of gasoline, indicating a problem with the engine. You’ll probably notice the Check Engine light is on as soon as you get the Emissions System Problem message.

Misfire in the engine.

When you press the gas pedal, you may notice a delay or misfires. The mixture of fuel and air in your combustion chamber will become imbalanced as a result of the fuel injectors’ inability to supply enough fuel, causing your engine to misfire.

Starting the automobile is difficult.

You may have trouble starting the automobile if the fuel injectors are unable to supply enough gasoline to the engine.

Related: Symptoms of Bad Fuel Injectors – Instant Fix & Caution

What is the problem with the emission system on the 2017 Honda Pilot?

Emissions system problem Honda pilot 2017
Emissions system problem Honda pilot 2017

With essence, an EGR valve failure or a loose gas cap are the most common causes of emissions system issues or problems in the 2017 Honda Pilot. The check engine light is turned on by the engine control unit, which regulates the engine (CEL). When the control unit in your engine detects a problem, it sends a signal to the dashboard, which flashes the symbol.

The CEL may glow for a variety of reasons, despite its specific signals that tell you exactly what’s wrong with your car, such as the coolant temperature light that indicates overheating. As a consequence, you’ll need to take your car to a technician to have the problem diagnosed by an expert.

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Is it possible to clean my fuel injectors?

Cleaning your fuel injectors will only make the warning notice disappear for a few weeks at most, as it will not solve the fundamental problem. I strongly advise you to have your injectors changed right soon.

Is it possible that an issue with the exhaust system is causing excessive fuel consumption?

If one of these sensors fails, your car may begin to use excessive amounts of gasoline, perhaps increasing pollution. This is because your catalytic converter cleans the emissions from the air, and increasing emissions are hard on the converter, causing it to wear out more quickly.

If your dashboard displays a check engine or emissions light, use an OBD II scan tool to figure out which component detected a problem. Various pollution control systems integrated into your automobile engine aid in reducing the amount of dangerous gases released into the atmosphere.

What is the duration of Honda’s emissions warranty?

Honda issued a Technical Service Bulletin (TBS) in November 2020, informing dealers of the problem, providing instructions on how to identify and rectify it, and extending the warranty to ten years or 150,000 miles, whichever comes first.

Is driving with an Emissions System Problem notice on the dashboard safe?

This question does not have a straightforward yes or no response. It depends on when the notice first appeared on your dashboard. If you just received the notification and haven’t seen any changes while driving the car, you could keep driving it for a few more days until you can get it to a repair.

However, unless you really need the automobile, I don’t advocate it. Driving while this warning message is shown may result in further damage to the catalytic converter, as previously described.

If you’ve been driving the car with the warning light on for a time, I recommend not driving it any further until you take it to a dealership.

How much does it cost to correct a problem with an emissions system?

If you see this notification on your Honda Pilot, I recommend taking it to a dealer to get it addressed, since the warranty may cover the cost of the repair. Honda, as previously said, is aware of this prevalent problem and has extended the warranty on the Honda Pilot model.

If your automobile has traveled more than 150,000 miles and the dealer refuses to cover the repair costs, you may be forced to pay out of pocket.

In average, replacing the fuel injectors on a Honda Pilot costs $300 in components and $300 to $400 in labor. You might save money on labor by replacing the fuel injectors yourself if you are adept at following instructions.

Can you stop the Emissions System Problem notification from appearing?

While some mechanics advise using premium gasoline because of the higher octane, there is no way to avoid this issue on a Honda Pilot. Engines that operate on higher octane gasoline are more efficient and create less emissions.

Using premium fuel will just delay the problem, which will become a problem if your car’s warranty expires.


If you see the dreaded Emissions System Problem notification, take your car to a dealer and get it inspected straight immediately. Delaying this will just exacerbate the problem and risk severe damage to the catalytic converter.


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