The Causes Symptoms And How To Fix Engine Error Code P1520

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Are you having trouble with your engine and getting an error code P1520? This is a common problem, but it can be complicated to diagnose and repair.

In this article, we’ll discuss:

  • What Error Code P1520 is
  • The common causes of this error code
  • How to recognize the symptoms of Error Code P1520
  • How to diagnose the issue
  • How to fix it

With a bit of knowledge and some patience, you can get your engine running smoothly again. Let’s dive in!

What is Engine Error Code P1520?

Have you ever experienced the frustration of an unknown engine issue? Error code P1520 could be the cause!

Engine error code P1520 is a generic powertrain trouble code, which indicates an electrical fault in the fuel system. It can often manifest itself as a misfire or hesitation during acceleration due to a lean air/fuel ratio or incorrect ignition timing.

The most common causes are vacuum leaks, faulty fuel injectors or plugs, and weak spark plug wires. In some cases, it can also indicate that the fuel pressure regulator is malfunctioning or needs to be adjusted.

To fix this error code, start by checking for any obvious signs of problems such as visible damage to wiring harnesses or vacuum hoses. If nothing appears wrong visually, then test each component of the fuel system separately using an OBD-II scanner and a multimeter to make sure they are functioning correctly.

If necessary, replace the failing parts and reset your car’s computer with an OBD-II scanner. With these steps complete, you should have successfully fixed your engine error code P1520 issue and restored normal operation to your vehicle!

Common Causes of Error Code P1520

Knowing the underlying causes of this issue can help you determine the best course of action to take. Engine error code P1520 is typically associated with system malfunctions or inefficient sensors that may be related to vehicle emissions control.

These malfunctions occur when a PCM (powertrain control module) has difficulty monitoring and controlling different components on a car’s engine, such as the air-fuel ratio, exhaust gas recirculation, and spark timing.

Some common causes for this error code include faulty oxygen sensors, faulty MAF (mass airflow) sensor, or an EGR (exhaust gas recirculation) valve stuck open.

In addition to malfunctioning parts, other issues such as vacuum leaks or low fuel pressure can produce this code as well. Vacuum leaks are typically caused by worn or broken hoses or valves which allow unmetered air into the engine intake manifold and cause an imbalance in the air-fuel ratio. Low fuel pressure is usually caused by a weak fuel pump or clogged fuel filter which restricts fuel flow to the injectors resulting in improper combustion.

Finally, if the check engine light does come on with this code, it’s important to have your vehicle inspected immediately so that any problems can be diagnosed and fixed before they cause further damage. Proper diagnosis will also help identify any additional issues such as misfiring cylinders which could also be contributing factors in producing this code.

Recognizing the Symptoms of Error Code P1520

Worried about your car’s health? Recognizing the signs of error code P1520 can help you catch potential problems before they become serious.

Common symptoms associated with this fault code include fuel leakage, misfiring, reduced engine power, and sensor malfunction. Poor fuel economy and a warning light on the dashboard may also indicate that there is an issue with your vehicle’s system.

Noting any changes in performance or strange smells coming from the engine are important to do as soon as possible when diagnosing this problem.

Here are some of the most common indicators of error code P1520:

  • Fuel Leakage: This is one of the most common signs that something is wrong with your vehicle’s engine. If you notice any type of fuel leaking from underneath your car or a smell of gasoline near it, then it could be because of this fault code.
  • Misfire: Another symptom to look out for is if your vehicle starts to misfire while driving or idling at low speeds. This can cause a decrease in acceleration and power output due to the incomplete combustion process in affected cylinders.
  • Reduced Engine Power: You may also notice a decrease in overall performance when error code P1520 is present, especially during acceleration or when going uphill with heavy loads inside your car. This can be caused by several different factors including clogged filters and faulty sensors which affect how much air enters into the cylinders for combustion purposes.
  • Sensor Malfunction: Poorly functioning sensors can lead to inaccurate readings being sent back to the computer which will result in incorrect amounts of fuel being injected into each cylinder, causing issues such as misfires, stalling, rough running etcetera.
  • Warning Light: Finally, if all else fails then look out for any warning lights on your dashboard indicating an issue with emissions control systems – these are often related directly to error codes like P1520 so it would be best not to ignore them!

It’s important not take risks when dealing with faults like these – they could end up costing you more money than necessary if left untreated too long! Make sure to get professional advice from qualified mechanics who have experience dealing with similar issues before attempting any DIY repairs on your own.

Diagnosing Error Code P1520

If your car is showing signs of trouble, diagnosing error code P1520 can help you get back on the road fast. To monitor and diagnose this issue, vehicle owners should understand its underlying causes and symptoms in order to properly address it. Knowing these things will also ensure that the necessary repairs meet safety requirements and pass emissions testing.

Error code P1520 typically appears when there are issues with the throttle control system or acceleration pedal position sensor circuit. It may be caused by a worn accelerator cable, an open or shorted circuit in the wiring harness, a defective accelerator pedal position (APP) sensor, or a faulty ECU/PCM (Engine Control Unit/Powertrain Control Module). Additionally, components such as vacuum hoses that connect to the engine intake manifold could be loose or damaged.

To identify which part of your car is causing the problem, begin by inspecting all related components for damage and wear-and-tear. Then use a multimeter to check for any open circuits in the wiring harnesses connected to sensors or actuators. If no problems are found with these parts, then it’s likely that either the APP sensor itself is damaged or there’s an issue with your ECU/PCM. In both cases they need to be replaced before your car runs as expected again.

Repairing Error Code P1520

Don’t worry, you can easily get back on the road with a few simple repairs. Error code P1520 is typically caused by electronic malfunctions or sensor malfunction in your car’s engine. By following these steps, you can quickly diagnose and repair this issue:

  1. Inspect for loose connections or wires in the car’s engine management system.
  2. Check the fuel injectors for any signs of corrosion or debris buildup that could be hindering proper functionality.
  3. Replace any faulty parts that are causing problems such as sensors or actuators in the system.
  4. Reset all fault codes after performing repairs so that they don’t cause future issues down the line.

Once you’ve identified and fixed whatever part was causing the error code to appear, it should no longer be an issue for your car’s engine going forward! If done properly, you’ll have gotten out of this jam without having to take a trip to your local mechanic – saving time and money in the process!

Frequently Asked Questions

Is Error Code P1520 hard to diagnose?

Diagnosing error code P1520 in your vehicle can be tricky. It pays to first understand some basic vehicle diagnostics and the common causes of this error code.

While it’s possible to identify and fix the problem yourself, it’s highly recommended that you take your car to a professional mechanic for further investigation if the issue persists. Doing so will ensure that you receive a thorough diagnosis and an accurate repair solution for your engine’s error code P1520.

Are there any preventative measures to avoid Error Code P1520?

When it comes to avoiding engine error code P1520, the best preventative measure is regular maintenance and engine diagnostics.

To ensure that your car is functioning properly and not prone to error codes, perform regular inspections of the fuel system, spark plug wires, ignition coils, and other components.

Additionally, you should have your car serviced every 6 months or so in order for a certified mechanic to analyze the condition of your engine.

This way, any potential problems can be addressed quickly before they lead to costly repairs or potentially dangerous situations.

How long does it take to fix Error Code P1520?

Are you wondering how long it takes to fix Error Code P1520? Well, it depends. It could take anywhere from a few hours to a few days, depending on the particular issue and the age of the engine.

First off, you should complete some basic troubleshooting steps and create a checklist of preparation for diagnosing and fixing the error code. This includes checking your vehicle’s fluid levels, inspecting any wiring or hoses that could be loose, and verifying that all the components are working properly. Keep in mind that these checklists may vary based on your specific make and model of vehicle.

With proper preparation and knowledge of the issue at hand, you can get back up and running in no time!

Is Error Code P1520 a common issue?

Error Code P1520 is a relatively common issue for many makes and models of vehicles. The prevalence rate varies depending on the age and type of vehicle, but it’s generally a fairly widespread problem.

This issue can have far-reaching cost implications, so it’s important to be aware of it. You should take steps to fix it as soon as possible in order to avoid further damage and repair costs.

Are there any tips to recognize Error Code P1520 quickly?

You can recognize error code P1520 early on by regularly maintaining your engine and keeping an eye out for any warning signs.

Early detection is key to avoiding more extensive damage and costly repairs down the line, so make sure you’re aware of any changes in performance or strange noises coming from your engine.

By conducting regular maintenance checks, you can catch the issue before it gets worse and prevent further problems from arising.

Investing in regular maintenance will help you easily identify P1520 quickly and take action to fix it right away.


You’ve learned the causes, symptoms, and how to fix engine error code p1520. This problem can be a major inconvenience if left untreated. Fortunately, you now know how to identify, diagnose, and repair this issue.

On average, repairing this error correctly takes about 1-2 hours of labor. So, next time you encounter engine error code p1520, don’t panic! With the right knowledge and tools in hand, you’ll have your vehicle back up and running quickly and safely.