What Is 7E8 Engine Code: How To Diagnose And Fix!

When you use an OBD scanner to check errors from the engine, there are many possible cases. You will probably face one or more issues that you can find in the code.

However, when the screen appears, codes like 7E8 can make you confused and not know what to do because it is so strange!

Do not worry! All the most important information and how to handle it will be revealed right in the next sections!

What Is 7E8 Engine Code? 

What does 7E8 engine code mean? Code 7E8 shows up when there is something wrong with the emission system, particularly the loss of air pressure in the evaporative emission control system.

What Does Code 7E8 Mean?

This 7E8 engine code is a general code, implying that your car is enduring an issue related to air or fuel intake. You will see the Check Engine light turning on as a result. 

Furthermore, the Check Engine light may illuminate due to a temporary misreading of a machine sensor. It could indicate something else when it appears alongside the error code 7EA.

However, you can check the issue yourself at home with an OBD-II scanner. Some tools will even suggest repairs you can do in your own garage.

And certainly, you need to learn how to use an OBD-II scanner to utilize this one.

Common Symptoms

There aren’t many symptoms of this code, and the Check Engine Light is the most visible.

Because it can bear a different code meaning, you can misunderstand this signal and about detecting engine problems.

As a result, you need to scan the code to determine the problem’s severity and the urgency for the fix to save the machine. An OBD-II scan tool should display the code 7E8 engine in this situation.

Low mpg (mileage per gallon) or reduced performance are also symptoms of this issue. You will notice a decrease in the power because the car is under load and the tachometer begins to climb.

This is due to an incorrect air-fuel ratio (AFR) for combustion. It can be overly rich or underweight.

The same is true for mpg. If the machine does not receive enough air to complete the fuel combustion, it will consume more gasoline than normal.

As a result, you will see the darker smoke coming from the exhaust pipe.

What Is 7E8 Engine Code
Check Engine Light is a common signal of 7E8

The Causes 

When you determine their engine code 7E8, some of the following can be the cause of it:

Broken Fuel Filler Cap

Absent Fuel Cap
The fuel filler cap

The fuel filler cap is critical to the car’s evaporative emission control system. It keeps fuel from evaporating in the fuel tank and keeps foreign materials and water from entering and contaminating the power.

It’s common damage when a gas smell lingers inside the cabin, failure to properly tighten, and the Check Engine light on are all signs of a damaged or failing filler cap.

A malfunctioning one makes it evaporate or has issues regulating air pressure within the tank.

Damaged FTPS (Fuel Tank Pressure Sensor)

The FTPS, which monitors the pressure in the system, is also an important part of an evaporative emission system.

It enables the car to spot evaporative leaks caused by loose or damaged fuel/gas caps.

A faulty FTPS sends an inaccurate engine data stream to the engine control module with the EVAP emission system’s operation.

Damaged Fuel Vapor Lines

Excess fuel is returned to the gas tank via its vapor lines for recirculation. They primarily transport its vapor from the pump to the gas tank, where it cools and condenses as liquid gasoline.

There will be a significant loss if its vapor lines leak, are disconnected, or are unplugged. The machine may be deprived of fuel, resulting in the code 7E8 engine.

This also creates a bad fuel economy because much of it is lost due to exhaust leaks.

Damaged Canister Close Valve or Fuel Canister Valve

Your car fuel canister is filled with charcoal to trap the vapor that escapes into the atmosphere. 

The trapped vapor is returned to the engine and burned via the purge valve (canister close valve). That is the way they help to reduce air pollution. A faulty one does not serve its intended purpose.

Broken Fuel Pump Seal 

A vehicle’s gasket or pump seal keeps fuel oil from leaking on the cam case. To put it simply, it seals the pump.

If you have a faulty seal, these leaks will trigger issues that may cause the machine to run out of energy. This may also set off the 7E8 code.

Replacing the fuel pump seal is necessary to prevent leaking
Replacing the fuel pump seal is necessary to prevent leaking

Faulty Pressure/Purge Control Solenoid Valve

Its Purge Control Solenoid Valve is primarily responsible for regulating emissions from your vehicle. The captured fuel vapors are stored in the charcoal canister before being returned to the machine.

The system detects a problem when a faulty one fails to respond to control signals.

How To Fix The 7E8 Engine Code?

Handling this engine code entails determining the underlying cause and taking the right move. You can take a look as these fixes for the 7E8 engine code for consideration:

  • Fix any leaking, unplugged, or disconnected fuel vapor lines.
  • Replace any fuel filler caps that are damaged or missing.
  • Restore the faulty fuel filler pipe.
  • Replace or repair a broken fuel canister.
  • Repair or replace a defective FTPS. 
  • Fix or replace a malfunctioning purge or pressure control solenoid valve.
  • Install new fuel pump seals if needed.

How To Diagnose Engine Code 7E8? 

Visual inspection for fuel system leaks or smelling the cabin for gasoline odors may cause the diagnostic code. In this case, you may need to change a fuel pump, line, etc. 

However, using a multi-purpose OBD scanner to check the code and identify potential causes or problems to be fixed is the best approach. If you use the OBD tool, this process is simple.

Because of the numerous possible causes, diagnosing engine code 7E8 can be time-consuming.

That is why, if you are not an experienced DIYer, you should bring your vehicle to get help from a technical mechanic with professional auto repair experience.

OBD scanning tool is helpful in this task

How Much Does It Cost To Fix 7E8 Engine Code? 

When your car’s error 7E8 engine code flashes, the emission control system requires immediate action. A proper diagnosis may necessitate the replacement of the canister or device that traps vapor from evaporation.

It would be better to drive your car to a reliable service center to get help from a technical mechanic. This repair cost starts from $400 to $600 to fix these issues.

This price will fluctuate depending on your area’s labor cost and each repair shop’s fee.


What Are The Differences Between Engine Code 7E9 & 7E8?

How can you identify the 7E8 and 7E9 engine codes? Some of the differences below will help you distinguish between them:


The 7E8 7E9 engine code affects the control module menu and indicates the common issues of the machine.


  • 7E8: As mentioned above, it appears to signal a problem with the engine control, specifically the emission system.

Additionally, the light may illuminate due to a temporary sensor code reading missing. When you see this one with the 7EA code, it could mean something else.

  • 7E9: Code 7E9 indicates a problem with the transmission management that results in a decrease in transmission performance. A lack of fluid can cause fuel leaks, slipping, and overheating.

The fault code displays warnings about potential causes, and the professional mechanic can investigate. Transmission errors frequently result in unresponsiveness, which may necessitate diagnose and repairs from a professional.

7E8 and 7E9 codes are different

What Happens If I Continue Driving With The Check Engine Light On?

The general rule is that when you see the Check Engine Light code, you should not drive the car. It’s a true emergency. It frequently indicates a machine misfire.

If you continue to drive, you will almost certainly cause irreversible damage, primarily to the catalytic converter.

However, if you don’t know how to check and are on your way, take your car to a nearby dairy repair facility. Experts will assist you in diagnosing and fixing errors.

How To Turn Off The Check Engine Light?

When you see the intermittent flashing Check Engine Light, you have four ways below to fix it:

  • Use the OBD scanner to find the error code to clear this light.
  • Keep driving for 5 or 10 minutes and let it clear by itself. This is suitable when you diagnose and find out no issues.
  • Turn the car ignition on and off a few times to restart your vehicle.
  • Disconnect and plug in Battery/ECM Hard Reset Technique again.
Check engine light
You have many ways to turn of Check Engine Light

How Long Does It Take To Reset A Car’s Computer?

Unfortunately, there is no simple answer to this question. The length of time can vary. A lot depends on how frequently you drive the vehicle, driving, and how you drive.

For the Engine Control Unit to relearn things, certain conditions must be met. Different types of driving are required to be relearned.

Normally, the ECU can relearn quickly. If you drive your car continuously for 20-25 minutes, it may relearn the fundamentals of fuel injection and air intake codes.

Other tasks, on the other hand, may take longer.


What is 7E8 engine code? You’ve got all the necessary information about it!

Although it is not considered a too dangerous code, you should identify the engine issues by thoroughly scanning and detailed checking.

If you don’t have experience, it’s advisable to get help from car mechanics or a third-party service.

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